Neodymium perrhenate
Neodymium perrhenate is an inorganic compound with the chemical formula Nd3, which exists in anhydrous and tetrahydrate. It can be obtained by reacting excess neodymium oxide with 240 g/L perrhenic acid solution. In its solution, NdReO42+ and Nd2+ can be observed with stability constants of 16.5 and 23.6, respectively.
Nd4Re6O19 can be obtained by reacting neodymium perrhenate and NdRe2 at high temperature.