I. O. Troyanchuk, D. V. Karpinsky, A. N. Chobot, D. G. Voitsekhovich, V. M. Dobryanskii, “Phase transformations in Pr1–xSrxCoO3”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2006, Volume 84, Issue 3,Pages 180

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CONDENSED MATTER

Phase transformations in Pr_1–xSr_xCoO₃

I. O. Troyanchuk, D. V. Karpinsky, A. N. Chobot, D. G. Voitsekhovich, V. M. Dobryanskii

Institute of Solid State Physics and Semiconductors NASB

Abstract: The elastic properties and crystal structure of the Pr_1−xSr_xCoO₃ system are studied. Two types of crystal structure transitions are found. For the composition x = 0.5, the monoclinic phase transforms to a rhombohedral one in the high-temperature transition (T ≈ 310 K), while the unit cell symmetry remains monoclinic though the unit cell parameters change drastically in the low-temperature transformation (T ≈ 110 K). It is suggested that the high-temperature transition is caused by the dimensional effect, while the low-temperature transition is associated with the presence of praseodymium ions actively involved in chemical bonding.

PACS: 62.20.Dc, 75.50.Dd, 76.30.Fc

Received: 28.06.2006