Zapeka B. Acoustic and optical properties of Sn2P2S6 and Sn2P2(Se0.28S0.72)6 proper ferroelectrics in the vicinity of the tricritical point

Українська версія

Thesis for the degree of Candidate of Sciences (CSc)

State registration number

0412U003807

Thesis Registration Form

0412U003807.pdf

Applicant for

Specialization

  • 01.04.07 - Фізика твердого тіла

22-05-2012

Specialized Academic Board

Д 35.071.01

Vlokh Institute of Physical Optics

Essay

Optical and acoustic properties of Sn2P2S6 and Sn2P2(Se0.28S0.72)6 ferroelectric crystals were studied in order to determine whether a Lifshitz point or a tricritical point exists on the concentration-temperature phase diagram of Sn2P2(SexS1-x)6 solid solutions. It was established that the second order ferroelectric phase transition takes place in Sn2P2(Se0.28S0.72)6 crystals. Splitting of the phase transition was not found, thus two critical points should exist on the phase diagram of Sn2P2(SexS1-x)6 solid solutions, namely a tricritical point and a triple one.

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Files

avto_zapeka.pdf

dys_zapeka.pdf

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