PHASE TRANSITIONS IN PEROVSKITES NEAR THE TRICRITICAL POINT: AN EXPERIMENTAL STUDY OF KMN(L-X)CA(X)F3 AND SRTIO3

dc.contributor.author	Gallardo M.C.
dc.contributor.author	Romero F.J.
dc.contributor.author	Hayward S.A.
dc.contributor.author	Salje E.K.H.
dc.contributor.author	Del Cerro J.
dc.date.accessioned	2021-02-03T02:18:28Z
dc.date.available	2021-02-03T02:18:28Z
dc.date.issued	2000
dc.identifier	https://elibrary.ru/item.asp?id=31883099
dc.identifier.citation	Mineralogical Magazine, 2000, 64, 6, 971-982
dc.identifier.issn	0026-461X
dc.identifier.uri	https://repository.geologyscience.ru/handle/123456789/24449
dc.description.abstract	We present experimental data for the Pm3m-I4/mcm phase transitions in the perovskite crystals KMn1-xCaxF3 and SrTiO3. Comparison of calorimetric data (latent heat and specific heat) with order parameter data (measured with X-ray rocking methods) indicates that these transitions follow mean-field behaviour, and may be described using Landau potentials where the free energy expansion includes terms up to Q 6. This potential is characteristic of transitions close to the tricritical point. Comparison of the behaviour of SrTiO3 and KMnF3 indicates that KMnF3 is closer to the tricritical point; a small amount of substitution of Ca for Mn causes the transition to cross the tricritical point from first order to second order behaviour.
dc.title	PHASE TRANSITIONS IN PEROVSKITES NEAR THE TRICRITICAL POINT: AN EXPERIMENTAL STUDY OF KMN(L-X)CA(X)F3 AND SRTIO3
dc.type	Статья

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