Patent ID: 8936731
Filing Date: 2015-01-20
Classification: C01G,C01P,C04B,H01L

Abstract:
1. A process for the preparation of an alkali metal niobium oxide of formula (Ia): wherein A is Li, Na, K, Rb, Cs, Fr, or a mixture thereof; B is Ba, Ca, Mg, Sr, or a mixture thereof, C is La, and/or Bi; 0≦u≦0.3; 0≦w≦0.3; 0≦x≦0.3, 0≦y<1 and 0≦z≦0.3, the values of u, w, x, y and z being independent of each other with the proviso that the sum of y+3/5z+u is less than 1 and with the proviso that the sum of 3w+2x is less than 1; comprising spray pyrolising an aqueous solution, comprising alkali metal (A) ions, Nb ions and optionally alkaline earth ions (B), Ta Sb, La, Bi, and/or Fe ions, to form a powder and calcining said powder.