High pressure studies of the phase transition in the ferroelectric Sn2P2S6статья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 февраля 2017 г.
Аннотация:We apply a method of pulse–adiabatic modulation of pressure to obtain heat
capacity and thermal expansion of ferroelectric Sn2P2S6 in the vicinity of the
second order phase transition at pressures to 5 kbar. The phase transition in
Sn2P2S6 does not change its nature and stays second order in the whole range
of pressure currently studied. The earlier conclusion on the tricritical features
of the phase transition in Sn2P2S6 cannot be confirmed. Discontinuities of
heat capacity and thermal expansion perfectly fit the Ehrenfest equation that
expected in the mean field theories. An excellent performance of the Ehrenfest
formula in a wide range of pressures establishes phase transition in Sn2P2S6 as
an almost ideal mean field phase transition.