T–p phase diagrams and the barocaloric effect in materials with successive phase transitions
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Автор:
Gorev, M. V.
Bogdanov, E. V.
Flerov, I. N.
Коллективный автор:
Институт инженерной физики и радиоэлектроники
Кафедра теплофизики
Дата:
2017-08Журнал:
Journal of Physics D: Applied PhysicsКвартиль журнала в Scopus:
Q1Квартиль журнала в Web of Science:
Q2Библиографическое описание:
Gorev, M. V. T–p phase diagrams and the barocaloric effect in materials with successive phase transitions [Текст] / M. V. Gorev, E. V. Bogdanov, I. N. Flerov // Journal of Physics D: Applied Physics. — 2017. — Т. 50 (№ 38).Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.
Аннотация:
An analysis of the extensive and intensive barocaloric effect (BCE) at successive structural
phase transitions in some complex fluorides and oxyfluorides was performed. The high
sensitivity of these compounds to a change in the chemical pressure allows one to vary the
succession and parameters of the transformations (temperature, entropy, baric coefficient)
over a wide range and obtain optimal values of the BCE. A comparison of different types
of schematic T–p phase diagrams with the complicated T( p) dependences observed
experimentally shows that in some ranges of temperature and pressure the BCE in compounds
undergoing successive transformations can be increased due to a summation of caloric effects
associated with distinct phase transitions. The maximum values of the extensive and intensive
BCE in complex fluorides and oxyfluorides can be realized at rather low pressure
(0.1–0.3 GPa). In a narrow temperature range around the triple points conversion from
conventional BCE to inverse BCE is observed, which is followed by a gigantic change of both
| SBCE| and | TAD|.