Gadolinium(III) oxide

Names
Other names

gadolinium sesquioxide, gadolinium trioxide

Identifiers

CAS Number

* 12064-62-9 Y

3D model (JSmol)

* Interactive image

ChemSpider |

* 140201 Y

EC Number |

* 235-060-9

PubChem CID

* 159427

RTECS number |

* LW4790000

UNII |

* 5480D0NHLJ Y

InChI

* InChI=1S/2Gd.3O/q2*+3;3*-2 Y

Key: CMIHHWBVHJVIGI-UHFFFAOYSA-N Y

* InChI=1/2Gd.3O/q2*+3;3*-2

Key: CMIHHWBVHJVIGI-UHFFFAOYAI

SMILES

* [Gd+3].[Gd+3].[O-2].[O-2].[O-2]

Properties

Chemical formula

| Gd2O3
Molar mass | 362.50 g/mol
Appearance  | white odorless powder
Density | 7.07 g/cm3 [1]
Melting point |  2,420 °C (4,390 °F; 2,690 K)

Solubility in water

| insoluble

Solubility product (Ksp)

| 1.8×10−23
Solubility | soluble in acid

Magnetic susceptibility (χ)

| +53,200·10−6 cm3/mol
Structure

Crystal structure

| cubic, cI80, Monoclinic

Space group

| Ia-3, No. 206, C2/m, No. 12
Hazards
Safety data sheet | External MSDS
GHS pictograms |
GHS Signal word | Warning

GHS hazard statements

| H319, H410

GHS precautionary statements

| P264, P273, P280, P305+351+338, P337+313, P391, P501
Related compounds

Other anions

| Gadolinium(III) chloride

Other cations

| Europium(III) oxide, Terbium(III) oxide

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Y verify (what is YN ?)
Infobox references

Gadolinium(III) oxide (archaically gadolinia) is an inorganic compound with the formula Gd2O3. It is one of the most commonly available forms of the rare-earth element gadolinium, derivatives of which are potential contrast agents for magnetic resonance imaging.

## Contents

* 1 Structure
* 2 Preparation and chemistry
* 3 Nanoparticles of Gd2O3
* 4 References

## Structure

Cubic Gd2O3 Monoclinic Gd2O3 (gadolinium atoms are green, oxygen atoms are red)

Gadolinium oxide adopts two structures. The cubic (cI80, Ia3), No. 206) structure is similar to that of manganese(III) oxide and heavy trivalent lanthanide sesquioxides. The cubic structure features two types of gadolinium sites, each with a coordination number of 6 but with different coordination geometries. The second polymorph is monoclinic (Pearson symbol mS30, space group C2/m, No. 12).[2] At room temperature, the cubic structure is more stable. The phase change to the monoclinic structure takes place at 1200 °C. Above 2100 °C to the melting point at 2420 °C, a hexagonal phase dominates.[3]

## Preparation and chemistry

Gadolinium oxide can be formed by thermal decomposition of the hydroxide, nitrate, carbonate, or oxalates.[4] Gadolinium oxide forms on the surface of gadolinium metal.

Gadolinium oxide is a rather basic oxide, indicated by its ready reaction with carbon dioxide to give carbonates. It dissolves readily in the common mineral acids with the complication that the oxalate, fluoride, sulfate and phosphate are very insoluble in water and may coat the grains of oxide, thereby preventing the complete dissolution.[5]

## Nanoparticles of Gd2O3

Several methods are known for the synthesis of gadolinium oxide nanoparticles, mostly based on precipitation of the hydroxide by the reaction of gadolinium ions with hydroxide, followed by thermal dehydration to the oxide. The nanoparticles are always coated with a protective material to avoid the formation of larger polycrystalline aggregates.[6][7][8]

Nanoparticles of gadolinium oxide is a potential contrast agent for magnetic resonance imaging (MRI). A dextran-coated preparation of 20–40 nm sized gadolinium oxide particles had a relaxivity of 4.8 s−1mM−1 per gadolinium ion at 7.05 T (an unusually high field compared to the clinically used MRI scanners which mostly range from 0.5 to 3 T).[6] Smaller particles, between 2 and 7 nm, were tested as an MRI agent.[7][8]

## References

1. ↑ Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0-07-049439-8.
2. ↑ Wells, A.F. (1984) Structural Inorganic Chemistry 5th edition Oxford Science Publications. ISBN 0-19-855370-6.
3. ↑ Adachi, Gin-ya; Imanaka, Nobuhito (1998). "The Binary Rare Earth Oxides". Chemical Reviews 98 (4): 1479–1514. doi:10.1021/cr940055h. PMID 11848940.
4. ↑ Cotton, S. (2006) Lanthanide and Actinide Chemistry Wiley ISBN 0-470-01006-1 p. 6
5. ↑ Yost, D.M, Russell, H. Jr., Garner, C.S. The Rare-Earth Elements and their Compounds, Wiley, 1947.
6. ↑ 6.0 6.1 McDonald, M; Watkin, K (2006). "Investigations into the Physicochemical Properties of Dextran Small Particulate Gadolinium Oxide Nanoparticles". Academic Radiology 13 (4): 421–27. doi:10.1016/j.acra.2005.11.005. PMID 16554221.
7. ↑ 7.0 7.1 Bridot, Jean-Luc; Faure, Anne-Charlotte; Laurent, Sophie; Rivière, Charlotte; Billotey, Claire; Hiba, Bassem; Janier, Marc; Josserand, VéRonique et al. (2007). "Hybrid Gadolinium Oxide Nanoparticles: Multimodal Contrast Agents for in Vivo Imaging". Journal of the American Chemical Society 129 (16): 5076–84. doi:10.1021/ja068356j. PMID 17397154.
8. ↑ 8.0 8.1 Engström, Maria; Klasson, Anna; Pedersen, Henrik; Vahlberg, Cecilia; Käll, Per-Olov; Uvdal, Kajsa (2006). "High proton relaxivity for gadolinium oxide nanoparticles". Magnetic Resonance Materials in Physics, Biology and Medicine 19 (4): 180–86. doi:10.1007/s10334-006-0039-x. PMID 16909260.

* v
* t
* e

Oxides

Mixed oxidation states|

* Antimony tetroxide (Sb2O4)
* Cobalt(II,III) oxide (Co3O4)
* Europium(II,III) oxide (Eu3O4)
* Iron(II,III) oxide (Fe<sub>3O4)
* Lead(II,IV) oxide (Pb3O4)
* Manganese(II,III) oxide (Mn3O4)
* Silver(I,III) oxide (Ag2O2)
* Triuranium octoxide (U3O8)
* Carbon suboxide (C3O2)
* Mellitic anhydride (C12O9)
* [[Chemistry:Praseodymium(III,IV) Praseodymium(III,IV) oxide]] (Pr6O11)
* Terbium(III,IV) oxide (Tb4O7)

+1 oxidation state|

* Copper(I) oxide (Cu<sub>2O)
* Caesium oxide (Cs2O)
* Dicarbon monoxide (C2O)
* Dichlorine monoxide (Cl2O)
* Gallium(I) oxide (Ga2O)
* Lithium oxide (Li2O)
* Potassium oxide (K2O)
* Rubidium oxide (Rb2O)
* Silver oxide (Ag2O)
* Thallium(I) oxide (Tl2O)
* Sodium oxide (Na2O)
* Water (hydrogen oxide) (H2O)

+2 oxidation state|

* Aluminium(II) oxide (AlO)
* Barium oxide (BaO)
* Beryllium oxide (BeO)
* Cadmium oxide (CdO)
* Calcium oxide (CaO)
* Carbon monoxide (CO)
* Chromium(II) oxide (CrO)
* Cobalt(II) oxide (CoO)
* Copper(II) oxide (CuO)
* Europium(II) oxide (EuO)
* Germanium monoxide (GeO))
* Iron(II) oxide (FeO)
* Lead(II) oxide (PbO)
* Magnesium oxide (MgO)
* Manganese(II) oxide (MnO)
* Mercury(II) oxide (HgO)
* Nickel(II) oxide (NiO)
* Nitric oxide (NO)
* Palladium(II) oxide (PdO)
* Silicon monoxide (SiO)
* Strontium oxide (SrO)
* Sulfur monoxide (SO)
* Disulfur dioxide (S2O2)
* Thorium monoxide (ThO)
* Tin(II) oxide (SnO)
* Titanium(II) oxide (TiO)
* Vanadium(II) oxide (VO)
* Zinc oxide (ZnO)

+3 oxidation state|

* Aluminium oxide (Al<sub>2O3)
* Antimony trioxide (Sb2O3)
* Arsenic trioxide (As2O3)
* Bismuth(III) oxide (Bi2O3)
* Boron trioxide (B2O3)
* Cerium(III) oxide (Ce2O3)
* Dibromine trioxide (Br2O3)
* Chromium(III) oxide (Cr2O3)
* Dinitrogen trioxide (N2O3)
* Dysprosium(III) oxide (Dy2O3)
* Erbium(III) oxide (Er2O3)
* Europium(III) oxide (Eu2O3)
* Gadolinium(III) oxide (Gd2O3)
* Gallium(III) oxide (Ga2O3)
* Holmium(III) oxide (Ho2O3)
* Indium(III) oxide (In<sub>2O3)
* Iron(III) oxide (Fe2O3)
* Lanthanum oxide (La2O3)
* Lutetium(III) oxide (Lu2O3)
* Manganese(III) oxide (Mn2O3)
* Neodymium(III) oxide (Nd2O3)
* Nickel(III) oxide (Ni2O3)
* Phosphorus trioxide (P4O6)
* Praseodymium(III) oxide (Pr2O3)
* Promethium(III) oxide (Pm2O3)
* Rhodium(III) oxide (Rh2O3)
* [[Chemistry:Samarium(III) Samarium(III) oxide]] (Sm2O3)
* Scandium oxide (Sc2O3)
* Terbium(III) oxide (Tb2O3)
* Thallium(III) oxide (Tl2O3)
* Thulium(III) oxide (Tm2O3)
* Titanium(III) oxide (Ti2O3)
* Tungsten(III) oxide (W2O3)
* Vanadium(III) oxide (V2O3)
* Ytterbium(III) oxide (Yb2O3)
* Yttrium(III) oxide (Y2O3)

+4 oxidation state|

* Americium dioxide (AmO2)
* Carbon dioxide (CO2)
* Carbon trioxide (CO3)
* Cerium(IV) oxide (CeO2)
* Chlorine dioxide (ClO2)
* Chromium(IV) oxide (CrO<sub>2)
* Dinitrogen tetroxide (N2O4)
* Germanium dioxide (GeO<sub>2)
* [[Chemistry:Hafnium(IV) Hafnium(IV) oxide]] (HfO2)
* Lead dioxide (PbO2)
* Manganese dioxide (MnO2)
* Neptunium(IV) oxide (NpO2)
* Nitrogen dioxide (NO2)
* Osmium dioxide (OsO2)
* Plutonium(IV) oxide (PuO2)
* Praseodymium(IV) oxide (PrO2)
* Protactinium(IV) oxide (PaO2)
* Rhodium(IV) oxide (RhO2)
* Ruthenium(IV) oxide (RuO<sub>2)
* Selenium dioxide (SeO2)
* Silicon dioxide (SiO2)
* Sulfur dioxide (SO2)
* Tellurium dioxide (TeO<sub>2)
* [[Chemistry:Terbium(IV) Terbium(IV) oxide]] (TbO2)
* Thorium dioxide (ThO2)
* Tin dioxide (SnO2)
* Titanium dioxide (TiO<sub>2)
* Tungsten(IV) oxide (WO2)
* Uranium dioxide (UO2)
* Vanadium(IV) oxide (VO2)
* Zirconium dioxide (ZrO2)

+5 oxidation state|

* Antimony pentoxide (Sb2O5)
* Arsenic pentoxide (As2O5)
* Dinitrogen pentoxide (N2O5)
* Niobium pentoxide (Nb2O5)
* Phosphorus pentoxide (P2O5)
* Protactinium(V) oxide (Pa2O5)
* Tantalum pentoxide (Ta2O5)
* Vanadium(V) oxide (V2O5)

+6 oxidation state|

* Chromium trioxide (CrO3)
* Molybdenum trioxide (MoO3)
* Rhenium trioxide (ReO3)
* Selenium trioxide (SeO3)
* Sulfur trioxide (SO3)
* Tellurium trioxide (TeO3)
* Tungsten trioxide (WO3)
* Uranium trioxide (UO3)
* Xenon trioxide (XeO3)
* Iridium trioxide (IrO3)

+7 oxidation state|

* Dichlorine heptoxide (Cl2O7)
* Manganese heptoxide (Mn2O7)
* [[Chemistry:Rhenium(VII) Rhenium(VII) oxide]] (Re2O7)
* Technetium(VII) oxide (Tc2O7)

+8 oxidation state|

* Osmium tetroxide (OsO4)
* Ruthenium tetroxide (RuO4)
* Xenon tetroxide (XeO4)
* Iridium tetroxide (IrO4)
* Hassium tetroxide (HsO4)

Related|

* Oxocarbon
* Suboxide
* Oxyanion
* Ozonide
* Peroxide
* Superoxide

Oxides are sorted by oxidation state. Category:Oxides

* v
* t
* e

Gadolinium compounds

Gadolinium(III)|

* GdF3
* GdCl3
* GdBr3
* Gd2O3
* Gd2O2S
* Gd2(SO4)3
* Gd(NO3)3
* Gd2(C2O4)3
* Gd3Ga5O12
* Gd2SiO5

| Organogadolinium(III)|

* Gd(C5H7O2)3

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*[CID]: Compound ID
*[H319]: Causes serious eye irritation
*[H410]: Very toxic to aquatic life with long lasting effects
*[P264]: Wash … thoroughly after handling
*[P273]: Avoid release to the environment
*[P280]: Wear protective gloves/protective clothing/eye protection/face protection
*[P305+351+338]: IF IN EYES: Rinse continuously with water for several minutes. Remove contact lenses if present and easy to do – continue rinsing
*[P337+313]: Get medical advice/attention
*[P391]: Collect spillage
*[P501]: Dispose of contents/container to …
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