Тип публикации: статья из журнала
Год издания: 2015
Идентификатор DOI: 10.1557/jmr.2014.369
Ключевые слова: Composite, magnetic properties, phase transformation, Ceramic materials, Composite materials, Electric fields, Equations of state, Ferroelectric ceramics, Ferromagnetic materials, Ferromagnetism, Lead, Magnetic fields, Magnetization, Manganese oxide, Phase transitions, Specific heat, Effect of magnetic field, Electro-caloric effects, Ferromagnetic Phase Transition, Ferromagnetic transformations, Magnetic field variations, Magnetization behavior, Magnetoelectric couplings, Temperature changes, Magnetocaloric effects
Аннотация: The magnetization behavior under temperature and magnetic field variation was investigated for La0.7Pb0.3MnO3 ceramics and ferromagnetic-ferroelectric 0.85(La0.7Pb0.3MnO3)-0.15(PbTiO3) composite. The second-order ferromagnetic phase transition in manganite is shifted to the tricritical point in composite material. Comparison of theПоказать полностьюintensive caloric effect and the difference between relative cooling powers (RCP) in both materials proves a significant role of intrinsic pressure in elevating caloric efficiency in composite induced by elastic coupling between the grains of LPM and PT components. No temperature change in composite under an electric field of 2 kV/cm associated with electrocaloric effect or indirect magnetoelectric coupling was observed. The effect of magnetic field on some peculiar temperatures is considered. A contribution from pressure generated by magnetic field to baric coefficient dT/dp of ferromagnetic transformation temperature in composite was suggested. The results obtained were analyzed in the framework of the magnetic equation of state and compared with the experimentally measured heat capacity.
Журнал: JOURNAL OF MATERIALS RESEARCH
Выпуск журнала: Vol. 30, Is. 2
Номера страниц: 278-285
ISSN журнала: 08842914
Место издания: NEW YORK
Издатель: CAMBRIDGE UNIV PRESS