Electrical Conductivity in (Gdl-xCax)2Sn2O7±δPyrochlore System

Abstract

AbstractElectrical conductivity measurements were performed on Gd2Sn207as a function of temperature, P02and Ca doping concentration. An effective frenkel constant and oxygen vacancy mobility were derived. The high level of intrinsic anion disorder found in this study is consistent with expectations based on the cation radius ratio (rA/rB) which was earlier found to be important in determining anion disorder in A2B207pyrochlore compounds [1]. The magnitude of the ionic conductivity in Gd2Sn2O7was found to be depressed relative to Gd2(Til-xZrx)207based systems due to a high oxygen vacancy migration energy.