Chobal O. The influence of pressure and size effects on the thermal properties of Sn2P2S6 type crystals with tricritical Lifshitz point in the state diagram

Українська версія

Thesis for the degree of Candidate of Sciences (CSc)

State registration number

0413U006391

Thesis Registration Form

0413U006391.pdf

Applicant for

Specialization

  • 01.04.07 - Фізика твердого тіла

30-10-2013

Specialized Academic Board

Д 76.051.01

Essay

Based on the analysis of transformation of experimental temperature dependences of the heat capacity of Sn2P2S6 crystals under the influence of hydrostatic pressure, coordinates of the tricritical Lifshitz point in the phase diagram of (PbySn1-y)2P2(SexS1-x)6 solid solutions are determined. The abnormal decrease of thermal conductivity with increasing pressure, which is found in ferroelectric phase of Sn2P2S6 crystals. Using cluster models of Sn2P2S6 crystals, which are constructed based on the results of ab initio calculation, the influence of size effects on the structural, electronic, vibrational and thermodynamic properties of tin thiohypodiphosphate crystals is investigated. Using the method of high-energy milling of the starting material (polycrystalline samples) the Sn2P2S6 nanoparticles are obtained and their thermal properties are investigated.

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