The low-temperature macroscopic phase separation in La0.5Ba0.5CoO3 − δ cobaltite
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- Troyanchuk, I.O., Karpinsky, D.V., Bushinsky, M.V. et al. Jetp Lett. (2011) 93: 139. doi:10.1134/S0021364011030167
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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 Tc ∼ 170 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).