Neodymium tantalate forms violet crystals of the monoclinic system, with space groupI2/a, unit cell dimensions a = 0.55153 nm, b = 1.12388 nm, c = 0.51184 nm, β = 95.731°, with formulas per unit cell Z = 4.[4]
There is a metastable high-pressure phase of the monoclinic system, space group P21/c, cell parameters a = 0.75920 nm, b = 0.54673 nm, c = 0.77022 nm, β = 100.032°, Z = 4.[5]
↑ 1.01.1Krylov, E. I.; Strelina, M. M. Praseodymium and neodymium orthotantalates. Zhurnal Neorganicheskoi Khimii, 1961. 6: 235-235. ISSN 0044-457X.
↑U. Schaffrath, R. Gruehn (1988-12-01). "Nd7,33Ta8O28CI6 — ein Zwischenprodukt des thermischen Abbaus von Nd2Ta2O7Cl2: Präparation, Struktur und magnetische Eigenschaften / Nd7,33Ta8O28Cl6 — an Intermediate Product of the Thermal Decomposition of Nd2Ta2O7Cl2: Preparation, Crystal Structure and Magnetic Properties". Zeitschrift für Naturforschung B43 (12): 1567–1574. doi:10.1515/znb-1988-1208. ISSN1865-7117.