CsNbOB2O5: the Basic Structure Type of the Borates AM0B20s (A = K, Rb, Cs, Tl; M = Nb, Ta) A new anhydrous borate, CsNbOB2O5 (caesium nio-batodiborate), has been found in the ternary system Cs2O-Nb2C>5-B2O3. The compound belongs to the already known AMOB2O5 family ...