Magnetization and magnetocaloric effect in La0.7Pb0.3MnO3 ceramics and 0.85(La0.7Pb0.3MnO3)-0.15(PbTiO3) composite

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, Magnetic properties, 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 the intensive 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.

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Издание

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

Авторы

  • Mikhaleva E. (Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences)
  • Eremin E. (Siberian Federal University)
  • Flerov I. (Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences)
  • Kartashev A. (Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences)
  • Sablina K. (Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences)
  • Mikhashenok N. (Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences)

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