Correlation of structural and electrical properties of PrBaCo2O5+δ thin films at high temperature

摘要

Epitaxial PrBaCo2O5td (PBCO, 0_x0002_ d_1) thin films were deposited by pulsed laser deposition. Thestructural and electrical properties of the films were characterized at high temperatures in reducedenvironments. X-ray diffraction scans at high temperature in reduced environment show potentialstructural transitions of PBCO as evidenced by both a large (Dl ? 0.335 nm) expansion of the out-plane (caxis) lattice, due to thermal and chemical expansion, and a step in the expansion of the c-axis latticeparameter. These transitions indicate the presence of oxygen vacancy ordering as the oxygen content inthe films is reduced. Resistivity measurements under the same environments also show evidence ofsharp transitions related with the structural transformations. This study helps the understanding of thestructure-property relationship of PBCO at high temperature and provides important technological information to utilize these materials for solid oxide fuel cell at intermediate temperatures.