Tricritical Lifshitz point in the temperature-pressure-composition diagram for (PbySn1-y)2 P2(SexS1-x)6 ferroelectrics

The heat capacity of Sn2P2S6 ferroelectric crystals has been measured under quasihydrostatic pressures up to 0.7 GPa. The analysis of the heat-capacity and literature data for the birefringence shows that the tricritical point of Sn2P2S6 is in the 0.20–0.25 GPa range. Moreover, in the approximation of a linear change in the free-energy expansion coefficients, with respect to concentration and pressure, thermodynamic trajectories have been constructed for (PbySn1−y)2 P2(SexS1−x)6 solid solutions. We have thereby identified the region of the T-p-y-x diagram for (PbySn1−y)2 P2(SexS1−x)6 showing the tricritical Lifshitz point.

Chobal, OleksandrDepartment of Solid State Electronics, Uzhhorod National University, Ukraine (författare)
Rizak, IDepartment of Integrated Technologies of Aviation Manufacture, National Aerospace University of “KhAI", Kharkov, Ukraine (författare)
Rizak, VDepartment of Solid State Electronics, Uzhhorod National University, Ukraine (författare)
Umeå universitetInstitutionen för fysik (creator_code:org_t)

Ingår i:Physical Review B Condensed Matter: American Physical Society80, s. 174107-0163-18291095-3795

Av författaren/redakt...: Andersson, Ove; Chobal, Oleksand ...; Rizak, I; Rizak, V

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