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Scandium

Topic: Chemistry

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Scandium, 21Sc
Scandium sublimed dendritic and 1cm3 cube.jpg
Scandium
Pronunciation/ˈskændiəm/ ​(SKAN-dee-əm)
Appearancesilvery white
Standard atomic weight Ar, std(Sc)44.955908(5)[1]
Scandium in the periodic table
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
–
↑
Sc
↓
Y
calcium ← scandium → titanium
Atomic number (Z)21
Groupgroup 3
Periodperiod 4
Block  d-block
Element category  d-block
Electron configuration[Ar] 3d1 4s2
Electrons per shell2, 8, 9, 2
Physical properties
Phase at STPsolid
Melting point1814 K ​(1541 °C, ​2806 °F)
Boiling point3109 K ​(2836 °C, ​5136 °F)
Density (near r.t.)2.985 g/cm3
when liquid (at m.p.)2.80 g/cm3
Heat of fusion14.1 kJ/mol
Heat of vaporization332.7 kJ/mol
Molar heat capacity25.52 J/(mol·K)
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1645 1804 (2006) (2266) (2613) (3101)
Atomic properties
Oxidation states0,[2] +1,[3] +2,[4] +3 (an amphoteric oxide)
ElectronegativityPauling scale: 1.36
Ionization energies
  • 1st: 633.1 kJ/mol
  • 2nd: 1235.0 kJ/mol
  • 3rd: 2388.6 kJ/mol
  • (more)
Atomic radiusempirical: 162 pm
Covalent radius170±7 pm
Van der Waals radius211 pm
Color lines in a spectral range
Spectral lines of scandium
Other properties
Natural occurrenceprimordial
Crystal structure ​hexagonal close-packed (hcp)
Hexagonal close packed crystal structure for scandium
Thermal expansionα, poly: 10.2 µm/(m·K) (at r.t.)
Thermal conductivity15.8 W/(m·K)
Electrical resistivityα, poly: 562 nΩ·m (at r.t., calculated)
Magnetic orderingparamagnetic
Magnetic susceptibility+315.0·10−6 cm3/mol (292 K)[5]
Young's modulus74.4 GPa
Shear modulus29.1 GPa
Bulk modulus56.6 GPa
Poisson ratio0.279
Brinell hardness736–1200 MPa
CAS Number7440-20-2
History
Namingafter Scandinavia
PredictionDmitri Mendeleev (1871)
Discovery and first isolationLars Fredrik Nilson (1879)
Main isotopes of scandium
Iso­tope Abun­dance Physics:Half-life (t1/2) Decay mode Pro­duct
44m2Sc syn 58.61 h IT 44Sc
γ 44Sc
ε 44Ca
45Sc 100% stable
46Sc syn 83.79 d β− 46Ti
γ –
47Sc syn 80.38 d β− 47Ti
γ –
48Sc syn 43.67 h β− 48Ti
γ –
Category Category: Scandium
view · talk · edit | references
Sc
data m.p. cat
in calc from C diff report ref
C 1541 — —
K 1814 1814 0
F 2806 2806 0
max precision 0
WD


input C: 1541, K: 1814, F: 2806
comment
Sc
data b.p. cat
in calc from C diff report ref
C 2836 — —
K 3109 3109 0
F 5136 5137 -1 delta
max precision 0
WD


input C: 2836, K: 3109, F: 5136
comment

Scandium is a chemical element; it has symbol Sc and atomic number 21. It is a silvery-white metallic d-block element. Historically, it has been classified as a rare-earth element,[6] together with yttrium and the lanthanides. It was discovered in 1879 by spectral analysis of the minerals euxenite and gadolinite from Scandinavia.[7]

Scandium is present in most of the deposits of rare-earth and uranium compounds, but it is extracted from these ores in only a few mines worldwide. Because of the low availability and difficulties in the preparation of metallic scandium, which was first done in 1937, applications for scandium were not developed until the 1970s, when the positive effects of scandium on aluminium alloys were discovered. To this day, its use in such alloys remains its only major application. The global trade of scandium oxide is 15–20 tonnes per year.[8]

The properties of scandium compounds are intermediate between those of aluminium and yttrium. A diagonal relationship exists between the behavior of magnesium and scandium, just as there is between beryllium and aluminium. In the chemical compounds of the elements in group 3, the predominant oxidation state is +3.

Properties

Chemical characteristics

Scandium is a soft metal with a silvery appearance. It develops a slightly yellowish or pinkish cast when oxidized by air. It is susceptible to weathering and dissolves slowly in most dilute acids. It does not react with a 1:1 mixture of nitric acid (HNO
3) and 48.0% hydrofluoric acid (HF), possibly due to the formation of an impermeable passive layer. Scandium turnings ignite in the air with a brilliant yellow flame to form scandium oxide.[9]

Isotopes

Main page: Physics:Isotopes of scandium

In nature, scandium is found exclusively as the isotope 45Sc, which has a nuclear spin of 7/2; this is its only stable isotope. Twenty-five radioisotopes have been characterized with the most stable being 46Sc, which has a half-life of 83.8 days; 47Sc, 3.35 days; the positron emitter 44Sc, 4 hours; and 48Sc, 43.7 hours. All of the remaining radioactive isotopes have half-lives less than 4 hours, and the majority of these have half-lives less than 2 minutes. This element also has five nuclear isomers, with the most stable being 44m2Sc (t1/2 = 58.6 h).[10]

The known isotopes of scandium range from 36Sc to 60Sc. The primary decay mode at masses lower than the only stable isotope, 45Sc, is electron capture, and the primary mode at masses above it is beta emission. The primary decay products at atomic weights below 45Sc are calcium isotopes and the primary products from higher atomic weights are titanium isotopes.[10]

Occurrence

In Earth's crust, scandium is not rare. Estimates vary from 18 to 25 ppm, which is comparable to the abundance of cobalt (20–30 ppm). Scandium is only the 50th most common element on Earth (35th most abundant in the crust), but it is the 23rd most common element in the Sun.[11] However, scandium is distributed sparsely and occurs in trace amounts in many minerals.[12] Rare minerals from Scandinavia[13] and Madagascar [14] such as thortveitite, euxenite, and gadolinite are the only known concentrated sources of this element. Thortveitite can contain up to 45% of scandium in the form of scandium oxide.[13]

The stable form of scandium is created in supernovas via the r-process.[15] Also, scandium is created by cosmic ray spallation of the more abundant iron nuclei.

  • 28Si + 17n → 45Sc (r-process)
  • 56Fe + p → 45Sc + 11C + n (cosmic ray spallation)

Production

The world production of scandium is in the order of 15–20 tonnes per year, in the form of scandium oxide. The demand is slightly higher,[16] and both the production and demand keep increasing. In 2003, only three mines produced scandium: the uranium and iron mines in Zhovti Vody in Ukraine , the rare-earth mines in Bayan Obo, China , and the apatite mines in the Kola Peninsula, Russia .[citation needed] Since then, many other countries have built scandium-producing facilities, including 5 tonnes/year (7.5 tonnes/year Sc
2O
3) by Nickel Asia Corporation and Sumitomo Metal Mining in the Philippines .[17][18] In the United States, NioCorp Development hopes[when?] to raise $1 billion[19] toward opening a niobium mine at its Elk Creek site in southeast Nebraska,[20] which may be able to produce as much as 95 tonnes of scandium oxide annually.[21] In each case, scandium is a byproduct of the extraction of other elements and is sold as scandium oxide.[22][23][24]

To produce metallic scandium, the oxide is converted to scandium fluoride and then reduced with metallic calcium.[25]

  • Sc
    2    O
    3     + 6HF → 2ScF
    3     + 3H
    2    O
  • 2ScF
    3     + 3Ca → 3CaF
    2     + 2Sc

Madagascar and the Iveland-Evje region in Norway have the only deposits of minerals with high scandium content, thortveitite (Sc,Y)
2(Si
2O
7), but these are not being exploited.[23] The mineral kolbeckite ScPO
4 · 2H2O has a very high scandium content but is not available in any larger deposits.[23]

The absence of reliable, secure, stable, long-term production has limited the commercial applications of scandium. Despite this low level of use, scandium offers significant benefits. Particularly promising is the strengthening of aluminium alloys with as little as 0.5% scandium.[26] Scandium-stabilized zirconia enjoys a growing market demand for use as a high-efficiency electrolyte in solid oxide fuel cells.

The USGS reports that, from 2015 to 2019 in the US, the price of small quantities of scandium ingot has been $107 to $134 per gram, and that of scandium oxide $4 to $5 per gram.[27]

Compounds

See also the categories Scandium compounds and Scandium minerals

Scandium chemistry is almost completely dominated by the trivalent ion, Sc3+. The radii of M3+ ions in the table below indicate that the chemical properties of scandium ions have more in common with yttrium ions than with aluminium ions. In part because of this similarity, scandium is often classified as a lanthanide-like element.[28]

Ionic radii (pm)
Al Sc Y La Lu
53.5 74.5 90.0 103.2 86.1

Oxides and hydroxides

The oxide Sc2O3 and the hydroxide Sc(OH)3 are amphoteric:[29]

Sc(OH)3 + 3 OH− → [Sc(OH)6]3− (scandate ion)
Sc(OH)3 + 3 H+ + 3 H2O → [Sc(H2O)6]3+

α- and γ-ScOOH are isostructural with their aluminium hydroxide oxide counterparts.[30] Solutions of Sc3+ in water are acidic due to hydrolysis.

Halides and pseudohalides

The halides ScX
3, where X= Cl, Br, or I, are very soluble in water, but ScF
3 is insoluble. In all four halides, the scandium is 6-coordinated. The halides are Lewis acids; for example, ScF
3 dissolves in a solution containing excess fluoride ion to form [ScF
6]3−. The coordination number 6 is typical for Sc(III). In the larger Y3+ and La3+ ions, coordination numbers of 8 and 9 are common. Scandium triflate is sometimes used as a Lewis acid catalyst in organic chemistry.[31]

Organic derivatives

Scandium forms a series of organometallic compounds with cyclopentadienyl ligands (Cp), similar to the behavior of the lanthanides. One example is the chlorine-bridged dimer, [ScCp
2Cl]
2 and related derivatives of pentamethylcyclopentadienyl ligands.[32]

Uncommon oxidation states

Compounds that feature scandium in oxidation states other than +3 are rare but well characterized. The blue-black compound CsScCl
3 is one of the simplest. This material adopts a sheet-like structure that exhibits extensive bonding between the scandium(II) centers.[33] Scandium hydride is not well understood, although it appears not to be a saline hydride of Sc(II).[4] As is observed for most elements, a diatomic scandium hydride has been observed spectroscopically at high temperatures in the gas phase.[3] Scandium borides and carbides are non-stoichiometric, as is typical for neighboring elements.[34]

Lower oxidation states (+2, +1, 0) have also been observed in organoscandium compounds.[35][36][37][38]

History

Dmitri Mendeleev, who is referred to as the father of the periodic table, predicted the existence of an element ekaboron, with an atomic mass between 40 and 48 in 1869. Lars Fredrik Nilson and his team detected this element in the minerals euxenite and gadolinite in 1879. Nilson prepared 2 grams of scandium oxide of high purity.[39][40] He named the element scandium, from the Latin Scandia meaning "Scandinavia". Nilson was apparently unaware of Mendeleev's prediction, but Per Teodor Cleve recognized the correspondence and notified Mendeleev.[41][42]

Metallic scandium was produced for the first time in 1937 by electrolysis of a eutectic mixture of potassium, lithium, and scandium chlorides, at 700–800 °C.[43] The first pound of 99% pure scandium metal was produced in 1960. Production of aluminium alloys began in 1971, following a US patent.[44] Aluminium-scandium alloys were also developed in the USSR.[45]

Laser crystals of gadolinium-scandium-gallium garnet (GSGG) were used in strategic defense applications developed for the Strategic Defense Initiative (SDI) in the 1980s and 1990s.[46][47]

Red giant stars near the Galactic Center

In early 2018, evidence was gathered from spectrometer data of significant scandium, vanadium, and yttrium abundances in red giant stars in the Nuclear Star Cluster (NSC) in the Galactic Center. Further research showed that this was an illusion caused by the relatively low temperature (below 3,500 K) of these stars masking the abundance signals, and that this phenomenon was observable in other red giants.[48]

Applications

The addition of scandium to aluminium limits the grain growth in the heat zone of welded aluminium components. This has two beneficial effects: the precipitated Al
3Sc forms smaller crystals than in other aluminium alloys,[49] and the volume of precipitate-free zones at the grain boundaries of age-hardening aluminium alloys is reduced.[49] The Al
3Sc precipitate is a coherent precipitate that strengthens the aluminum matrix by applying elastic strain fields that inhibit dislocation movement (i.e., plastic deformation). Al
3Sc has an equilibrium L12 superlattice structure exclusive to this system.[50] A fine dispersion of nano scale precipitate can be achieved via heat treatment that can also strengthen the alloys through order hardening.[51] Recent developments include the additions of transition metals such as zirconium (Zr) and rare earth metals like erbium (Er) produce shells surrounding the spherical Al
3Sc precipitate that reduce coarsening.[52] These shells are dictated by the diffusivity of the alloying element and lower the cost of the alloy due to less Sc being substituted in part by Zr while maintaining stability and less Sc being needed to form the precipitate.[53] These have made Al
3Sc somewhat competitive with titanium alloys along with a wide array of applications. However, titanium alloys, which are similar in lightness and strength, are cheaper and much more widely used.[54]

The alloy Al
20Li
20Mg
10Sc
20Ti
30 is as strong as titanium, light as aluminium, and hard as some ceramics.[55]

The main application of scandium by weight is in aluminium-scandium alloys for minor aerospace industry components. These alloys contain between 0.1% and 0.5% of scandium. They were used in Russian military aircraft, specifically the Mikoyan-Gurevich MiG-21 and MiG-29.[49]

Some items of sports equipment, which rely on lightweight high-performance materials, have been made with scandium-aluminium alloys, including baseball bats,[56] tent poles and bicycle frames and components.[57] Lacrosse sticks are also made with scandium. The American firearm manufacturing company Smith & Wesson produces semi-automatic pistols and revolvers with frames of scandium alloy and cylinders of titanium or carbon steel.[58][59]

Since 2013, Apworks GmbH, a spin-off of Airbus, have marketed a high strength Scandium containing aluminium alloy processed using metal 3D-Printing (Laser Powder Bed Fusion) under the trademark Scalmalloy which claims very high strength & ductility. [60]

Dentists use erbium-chromium-doped yttrium-scandium-gallium garnet (Er,Cr:YSGG) lasers for cavity preparation and in endodontics.[61]

The first scandium-based metal-halide lamps were patented by General Electric and made in North America, although they are now produced in all major industrialized countries. Approximately 20 kg of scandium (as Sc
2O
3) is used annually in the United States for high-intensity discharge lamps.[62] One type of metal-halide lamp, similar to the mercury-vapor lamp, is made from scandium triiodide and sodium iodide. This lamp is a white-light source with high color rendering index that sufficiently resembles sunlight to allow good color-reproduction with TV cameras.[63] About 80 kg of scandium is used in metal-halide lamps/light bulbs globally per year.[64]

The radioactive isotope 46Sc is used in oil refineries as a tracing agent.[62] Scandium triflate is a catalytic Lewis acid used in organic chemistry.[65]

The 12.4 keV nuclear transition of 45Sc has been proposed as a reference for timekeeping applications, with a theoretical precision as much as three orders of magnitude better than the current Cesium references. [66]

Health and safety

Elemental scandium is considered non-toxic, though extensive animal testing of scandium compounds has not been done.[67] The median lethal dose (LD50) levels for scandium chloride for rats have been determined as 755 mg/kg for intraperitoneal and 4 g/kg for oral administration.[68] In the light of these results, compounds of scandium should be handled as compounds of moderate toxicity. Scandium appears to be handled by the body in a manner similar to gallium, with similar hazards involving its poorly soluble hydroxide.[69]

See also

References

  1. ↑ Meija, Juris; Coplen, Tyler B.; Berglund, Michael; Brand, Willi A.; De Bièvre, Paul; Gröning, Manfred; Holden, Norman E.; Irrgeher, Johanna et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry 88 (3): 265–91. doi:10.1515/pac-2015-0305. 
  2. ↑ F. Geoffrey N. Cloke; Karl Khan; Robin N. Perutz (1991). "η-Arene complexes of scandium(0) and scandium(II)". J. Chem. Soc., Chem. Commun. (19): 1372–1373. doi:10.1039/C39910001372. 
  3. ↑ 3.0 3.1 Smith, R. E. (1973). "Diatomic Hydride and Deuteride Spectra of the Second Row Transition Metals". Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences 332 (1588): 113–127. doi:10.1098/rspa.1973.0015. Bibcode: 1973RSPSA.332..113S. 
  4. ↑ 4.0 4.1 McGuire, Joseph C.; Kempter, Charles P. (1960). "Preparation and Properties of Scandium Dihydride". Journal of Chemical Physics 33 (5): 1584–1585. doi:10.1063/1.1731452. Bibcode: 1960JChPh..33.1584M. 
  5. ↑ Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4. 
  6. ↑ "IUPAC Recommendations, Nomenclature of Inorganic Chemistry". http://www.iupac.org/publications/books/rbook/Red_Book_2005.pdf. 
  7. ↑ Samson, Iain M.; Chassé, Mathieu (2016), White, William M., ed. (in en), Scandium, Cham: Springer International Publishing, pp. 1–5, doi:10.1007/978-3-319-39193-9_281-1, ISBN 978-3-319-39193-9, https://doi.org/10.1007/978-3-319-39193-9_281-1, retrieved 2023-02-01 
  8. ↑ "Mineral Commodity Summaries 2020". US Geological Survey. https://pubs.usgs.gov/periodicals/mcs2020/mcs2020-scandium.pdf. 
  9. ↑ "Scandium." Los Alamos National Laboratory. Retrieved 2013-07-17.
  10. ↑ 10.0 10.1 Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003). "The NUBASE Evaluation of Nuclear and Decay Properties". Nuclear Physics A 729 (1): 3–128. doi:10.1016/j.nuclphysa.2003.11.001. Bibcode: 2003NuPhA.729....3A. http://hal.in2p3.fr/in2p3-00014184. 
  11. ↑ Lide, David R. (2004). CRC Handbook of Chemistry and Physics. Boca Raton: CRC Press. pp. 4–28. ISBN 978-0-8493-0485-9. https://archive.org/details/crchandbookofche81lide/page/4. 
  12. ↑ Bernhard, F. (2001). "Scandium mineralization associated with hydrothermal lazurite-quartz veins in the Lower Austroalpie Grobgneis complex, East Alps, Austria". Mineral Deposits in the Beginning of the 21st Century. Lisse: Balkema. ISBN 978-90-265-1846-1. 
  13. ↑ 13.0 13.1 Kristiansen, Roy (2003). "Scandium – Mineraler I Norge" (in no). Stein: 14–23. http://www.nags.net/Stein/2003/Sc-mineraler.pdf. 
  14. ↑ von Knorring, O.; Condliffe, E. (1987). "Mineralized pegmatites in Africa". Geological Journal 22: 253. doi:10.1002/gj.3350220619. 
  15. ↑ Cameron, A.G.W. (June 1957). "Stellar Evolution, Nuclear Astrophysics, and Nucleogenesis". CRL-41. http://www.fas.org/sgp/eprint/CRL-41.pdf. 
  16. ↑ Phoung, Sinoun; Williams, Eric; Gaustad, Gabrielle; Gupta, Ajay (2023-05-15). "Exploring global supply and demand of scandium oxide in 2030" (in en). Journal of Cleaner Production 401: 136673. doi:10.1016/j.jclepro.2023.136673. ISSN 0959-6526. https://www.sciencedirect.com/science/article/pii/S0959652623008314. 
  17. ↑ "Establishment of Scandium Recovery Operations". http://www.smm.co.jp/E/news/release/uploaded_files/20160428en.pdf. 
  18. ↑ Iwamoto, Fumio. "Commercial Scandium Oxide Production by Sumitomo Metal Mining Co. Ltd.". TMS. http://www.programmaster.org/PM/PM.nsf/ApprovedAbstracts/3D8E40595EA68C5C852581330004CB19?OpenDocument. 
  19. ↑ "NioCorp Announces Final Closing of Non-Brokered Private Placement for Aggregate Gross Proceeds of C$1.77 Million" (Press release). Retrieved 2019-05-18.
  20. ↑ "Long-discussed niobium mine in southeast Nebraska is ready to move forward, if it gathers $1 billion in financing .". http://www.omaha.com/money/long-discussed-niobium-mine-in-southeast-nebraska-is-ready-to/article_33913f7a-93fa-11e7-9144-8f1cad9c36eb.html. 
  21. ↑ NioCorp Superalloy Materials The Elk Creek Superalloy Materials Project, http://niocorp.com/wp-content/uploads/NIoCorp_Corporate_Presentation.pdf, retrieved 2019-05-18 
  22. ↑ Deschamps, Y.. "Scandium". mineralinfo.com. http://www.mineralinfo.org/Substance/Scandium/Sc.pdf. 
  23. ↑ 23.0 23.1 23.2 "Mineral Commodity Summaries 2015: Scandium". United States Geological Survey. http://minerals.usgs.gov/minerals/pubs/commodity/scandium/mcs-2015-scand.pdf. 
  24. ↑ Scandium. USGS.
  25. ↑ Fujii, Satoshi; Tsubaki, Shuntaro; Inazu, Naomi; Suzuki, Eiichi; Wada, Yuji (2017-09-27). "Smelting of Scandium by Microwave Irradiation" (in en). Materials 10 (10): 1138. doi:10.3390/ma10101138. ISSN 1996-1944. PMID 28953241. Bibcode: 2017Mate...10.1138F. 
  26. ↑ Zakharov, V. V. (2014-09-01). "Combined Alloying of Aluminum Alloys with Scandium and Zirconium" (in en). Metal Science and Heat Treatment 56 (5): 281–286. doi:10.1007/s11041-014-9746-5. ISSN 1573-8973. Bibcode: 2014MSHT...56..281Z. https://doi.org/10.1007/s11041-014-9746-5. 
  27. ↑ "Mineral Commodity Summaries". USGS. https://www.usgs.gov/centers/nmic/mineral-commodity-summaries. 
  28. ↑ Horovitz, Chaim T. (2012-12-06) (in en). Biochemistry of Scandium and Yttrium, Part 1: Physical and Chemical Fundamentals. Springer Science & Business Media. ISBN 978-1-4615-4313-8. https://books.google.com/books?id=xaPaBwAAQBAJ. 
  29. ↑ Cotton, Simon (2006). Lanthanide and actinide chemistry. John Wiley and Sons. pp. 108–. ISBN 978-0-470-01006-8. https://books.google.com/books?id=lvQpiVHrb78C&pg=PA108. Retrieved 2011-06-23. 
  30. ↑ Christensen, A. Nørlund; Stig Jorgo Jensen (1967). "Hydrothermal Preparation of α-ScOOH and of γ-ScOOH. Crystal Structure of α-ScOOH". Acta Chemica Scandinavica 21: 1121–126. doi:10.3891/acta.chem.scand.21-0121. 
  31. ↑ Deborah Longbottom (1999). "SYNLETT Spotlight 12: Scandium Triflate". Synlett 1999 (12): 2023. doi:10.1055/s-1999-5997. 
  32. ↑ Shapiro, Pamela J. (1994). "Model Ziegler-Natta α-Olefin Polymerization Catalysts Derived from [{(η5-C5Me4)SiMe2(η1-NCMe3)}(PMe3)Sc(μ2-H)]2 and [{(η5C5Me4)SiMe2(η1NCMe3)}Sc(μ1CH2CH2CH3)]2. Synthesis, Structures and Kinetic and Equilibrium Investigations of the Catalytically active Species in Solution". Journal of the American Chemical Society 116 (11): 4623. doi:10.1021/ja00090a011. 
  33. ↑ Corbett, J. D. (1981). "Extended metal-metal bonding in halides of the early transition metals". Accounts of Chemical Research 14 (8): 239–246. doi:10.1021/ar00068a003. 
  34. ↑ Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN:0-12-352651-5.
  35. ↑ Polly L. Arnold; F. Geoffrey; N. Cloke; Peter B. Hitchcock; John F. Nixon (1996). "The First Example of a Formal Scandium(I) Complex: Synthesis and Molecular Structure of a 22-Electron Scandium Triple Decker Incorporating the Novel 1,3,5-Triphosphabenzene Ring". Journal of the American Chemical Society 118 (32): 7630–7631. doi:10.1021/ja961253o. 
  36. ↑ F. Geoffrey N. Cloke; Karl Khan; Robin N. Perutz (1991). "η-Arene complexes of scandium(0) and scandium(II)". Journal of the Chemical Society, Chemical Communications (19): 1372–1373. doi:10.1039/C39910001372. 
  37. ↑ Ana Mirela Neculai; Dante Neculai; Herbert W. Roesky; Jörg Magull; Marc Baldus et al. (2002). "Stabilization of a Diamagnetic ScIBr Molecule in a Sandwich-Like Structure". Organometallics 21 (13): 2590–2592. doi:10.1021/om020090b. 
  38. ↑ Polly L. Arnold; F. Geoffrey; N. Cloke; John F. Nixon (1998). "The first stable scandocene: synthesis and characterisation of bis(η-2,4,5-tri-tert-butyl-1,3-diphosphacyclopentadienyl)scandium(II)". Chemical Communications (7): 797–798. doi:10.1039/A800089A. 
  39. ↑ Nilson, Lars Fredrik (1879). "Sur l'ytterbine, terre nouvelle de M. Marignac" (in fr). Comptes Rendus 88: 642–647. http://gallica.bnf.fr/ark:/12148/bpt6k30457/f639.table. 
  40. ↑ Nilson, Lars Fredrik (1879). "Ueber Scandium, ein neues Erdmetall" (in de). Berichte der deutschen chemischen Gesellschaft 12 (1): 554–557. doi:10.1002/cber.187901201157. https://zenodo.org/record/1425172. 
  41. ↑ Cleve, Per Teodor (1879). "Sur le scandium" (in fr). Comptes Rendus 89: 419–422. http://gallica.bnf.fr/ark:/12148/bpt6k3046j/f432.table. 
  42. ↑ Weeks, Mary Elvira (1956). The discovery of the elements (6th ed.). Easton, PA: Journal of Chemical Education. https://archive.org/details/discoveryoftheel002045mbp. 
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