Harold S. Horowitz

New oxide pyrochlores: A2[B2−xAx]O7−y (A = Pb, Bi; B = Ru, Ir)

A new series of mixed metal oxides with the pyrochlore structure has been discovered and can be described by the general formula A2[B2−xAx]O7−y where A = Pb or Bi, B = Ru or Ir, 0 < x ≲ 1 and 0 ≤ y ≤ 0.5. Values of x appreciably greater than zero may only be obtained at relatively low temperatures. It has been observed that when A = Pb and B = Ru, y = 0.5 for all values of x. Linear correlations between lattice parameter and x are presented for both Pb2[Ru2−xPbx]O6.5 and Bi2[Ru2−xBix]O7−y.