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VOLUME 93 (2011) | ISSUE 3 | PAGE 154
The low-temperature macroscopic phase separation in La0.5Ba0.5CoO3-δ cobaltite
Abstract
La0.5Ba0.5CoO2.87 has been characterized with neutron and synchrotron powder diffraction and magnetization measurements. This compound was shown to have a cubic crystal structure at temperatures above 200 K whereas slightly above the Curie point T_c\sim170 K the structural separation into two different pseudocubic phases gradually develops upon cooling. The structural transformation is reversible. At 2 K the sample consists of G-type antiferromagnetic oxygen-poor and ferromagnetic oxygen-rich phases (approximately 33% and 66% respectively).