Crystal Structure and Electrical Property of Pb(Sn_αSb_1-α)O₃ Ceramics

Abstract

Physical and electrical properties of Pb(Sn_aSb_1-a)O₃ ceramics are described. Pb(Sr Sbt1-a)O3 compound has a cubic pyrochlore type structure represented by the formula Pb₂Sn_2aSb_2-2aO_7-a (1/8<a<2/3). The relative intensity of X-ray diffraction lines fitted well with the calculated one when the crystal structure of Pb(Sn_aSb_1-a)O₃ was assumed to have the pyrochlore type structure.
The ceramics formed under the hot pressing condition had high density and its microstructure was composed of a mixture of fine grains (1-2μ) and coarse grains (-10μ).
Electrical resistivity of a hot pressed sample (a= 1/2) greatly changed its original value after annealing in oxygen gas.