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