Neodymium tantalate is an inorganic compound with the chemical formula NdTaO<sub>4</sub>. It is prepared by reacting neodymium oxide and tantalum pentoxide at 1200 ðC. It reacts with a mixture of tantalum pentoxide and chlorine gas at high temperature to obtain Nd<sub>2</sub>Ta<sub>2</sub>O<sub>7</sub>Cl<sub>2</sub>. It is ammonolyzed at high temperature to obtain oxynitrides of Nd-Ta.
Neodymium tantalate forms violet crystals of the monoclinic system, with space group I2/a, unit cell dimensions a = 0.55153 nm, b = 1.12388 nm, c = 0.51184 nm, ò = 95.731ð, with formulas per unit cell Z = 4.
There is a metastable high-pressure phase of the monoclinic system, space group P2<sub>1</sub>/c, cell parameters a = 0.75920 nm, b = 0.54673 nm, c = 0.77022 nm, ò = 100.032ð, Z = 4.
Neodymium tantalate is insoluble in water.