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Caloric effects and phase transitions in ferromagnetic–ferroelectric composites xLa0.7Pb0.3MnO3–(1−x)PbTiO3

Published online by Cambridge University Press:  13 December 2013

Ekaterina Mikhaleva ,
Igor Flerov ,
Andrey Kartashev ,
Mikhail Gorev ,
Alexander Cherepakhin ,
Klara Sablina ,
Nataly Mikhashenok ,
Nikita Volkov  and
Alexander Shabanov
Ekaterina Mikhaleva
Affiliation:
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk 660036, Russia; and Siberian Federal University, Krasnoyarsk 660079, Russia
Igor Flerov*
Affiliation:
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk 660036, Russia; and Siberian Federal University, Krasnoyarsk 660079, Russia
Andrey Kartashev
Affiliation:
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk 660036, Russia
Mikhail Gorev
Affiliation:
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk 660036, Russia; and Siberian Federal University, Krasnoyarsk 660079, Russia
Alexander Cherepakhin
Affiliation:
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk 660036, Russia
Klara Sablina
Affiliation:
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk 660036, Russia
Nataly Mikhashenok
Affiliation:
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk 660036, Russia
Nikita Volkov
Affiliation:
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk 660036, Russia; and Siberian Federal University, Krasnoyarsk 660079, Russia
Alexander Shabanov
Affiliation:
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk 660036, Russia
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Ceramic volumetric composites xLa0.7Pb0.3MnO3–(1−x)PbTiO3 (x = 0.18 and 0.85) were prepared. X-ray investigations have shown that rather low sintering temperature (800 °C) has allowed us to avoid the reaction and interdiffusion between two initial phases. Heat capacity, thermal expansion, and intensive magnetocaloric effect 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.

Keywords

compositephase transformation
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 24 , 28 December 2013 , pp. 3322 - 3331
Copyright
Copyright © Materials Research Society 2013 

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