Тип публикации: статья из журнала
Год издания: 2013
Идентификатор DOI: 10.1557/jmr.2013.360
Ключевые слова: composite, phase transformation, Composite materials, Equations of state, Ferromagnetic materials, Ferromagnetism, Lead, Manganese oxide, Phase transitions, Sintering, Stresses, Temperature, Thermal expansion, Barocaloric effects, Electric equations, Ferroelectric phase transition, Low sintering temperature, Sample composition, Thermodynamic theory, Wide temperature ranges, X-ray investigations, Lead compounds
Аннотация: Ceramic volumetric composites xLa(0.7)Pb(0.3)MnO(3)-(1-x)PbTiO3 (x = 0.18 and 0.85) were prepared. X-ray investigations have shown that rather low sintering temperature (800 degrees C) has allowed us to avoid the reaction and interdiffusion between two initial phases. Heat capacity, thermal expansion, and intensive magnetocaloric eПоказать полностьюffect were measured in a wide temperature range. The sample composition has a low influence on temperatures of the ferromagnetic and ferroelectric phase transitions in composites. Electro- and barocaloric effects were determined by analysis in the framework of thermodynamic theory, electric equation of state, Maxwell relationships, and entropy-temperature-pressure phase diagram. Multicaloric efficiency of composites is discussed and compared with that of initial La0.7Pb0.3MnO3 and PbTiO3 compounds. Variation of a relationship between components can significantly increase both barocaloric and magnetocaloric efficiency of compositional material due to the mechanical stress appearing between grains of different ferroic phases under magnetic field.
Журнал: JOURNAL OF MATERIALS RESEARCH
Выпуск журнала: Vol. 28, Is. 24
Номера страниц: 3322-3331
ISSN журнала: 08842914
Место издания: NEW YORK
Издатель: CAMBRIDGE UNIV PRESS