Synthesis and Crystallochemical Characterization of the Tb 1- x Bi x SrO 3 -Type Solid Solution

ISSN： 0022-4596

Source： Journal of Solid State Chemistry, Vol.122, Iss.2, 1996-03, pp. : 321-323

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

Solid solution of the Tb 1- x Bi x SrO 3 type was investigated under oxidizing sintering conditions. The domain of homogeneity was determined to be within the range 0 < x < 0.33. Variations of lattice parameters as well as sample densities vs. the substitution parameter x are given. The effective valency of Bi and Tb ions, V ¯ (Tb,Bi) , remains invariant and is close to +4 through the whole domain of homogeneity. The present data do not permit the exact variation of valencies of Bi and Tb ions to be separately recognized. However, the solubility limit found directly indicates a nearly +5 valency of Bi ions and a variable valency of Tb ions, the latter decreasing vs. x to the level of +3.5 characteristic for Tb 4 O 7 -the most stable terbium oxide in air. The possibility of a successful synthesis of the hypothetical Tb +3 Bi +5 Sr 2 O 6 is explored.