Dependence of lattice constant of Ba, Co-contained perovskite oxides on atmosphere, and measurements of water content

Abstract

In this work, water content of Ba[0.5]Sr[0.5]Co[x]]Fe[1 – x]O[3 – δ] and PrBaCo[2]O[5 + δ] was measured by Karl Fischer titration method. Dependence of the lattice constants of Ba[0.5]Sr[0.5]Co[0.8]Fe[0.2]O[3 – δ] and PrBaCo[2]O[5 + δ] on atmosphere was investigated by high temperature X-ray diffraction (HT-XRD) measurements. The results revealed that the lattice volumes of Ba[0.5]Sr[0.5]Co[0.8]Fe[0.2]O[3 – δ] and PrBaCo[2]O[5 + δ] increased when the atmosphere was altered from O2 to Ar, due to a release of oxygen from the lattice in a reducing atmosphere. Significantly low water contents were measured for both Ba[0.5]Sr[0.5]Co[x]Fe[1 – x]O[3 – δ] and PrBaCo[2]O[5 + δ] by Karl Fischer titration method.