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Materials 2018, 11(1), 85; https://doi.org/10.3390/ma11010085

Influence of Depolarizing Fields and Screening Effects on Phase Transitions in Ferroelectric Composites

1
Chemical Department, Voronezh State University, University sq. 1, 394018 Voronezh, Russia
2
Physical Department, Voronezh State University, University sq. 1, 394018 Voronezh, Russia
3
Institute of Physics and Technology, Moscow Technological University, Vernadsky Avenue 78, 119454 Moscow, Russia
*
Author to whom correspondence should be addressed.
Received: 5 December 2017 / Revised: 3 January 2018 / Accepted: 4 January 2018 / Published: 6 January 2018
(This article belongs to the Special Issue Smart Materials for Soft Sensors and Actuators)
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Abstract

The temperature of the transition to the polar state in ferroelectric composites, representing spherical ferroelectric inclusions embedded in a dielectric matrix, under a depolarizing field effect is investigated. This temperature is determined both in the absence and presence of screening effects of the depolarizing field of the bound charges of spontaneous polarization at the inclusions surface. The absence case shows that the Curie point shift is determined by the ratio of the Curie constant of the ferroelectric inclusion to the permittivity of the matrix. Screening effects show that the transition temperature shift decreases through multiplying the value by a decreasing factor equal to the ratio of the screening length to the radius of the ferroelectric inclusion. Examples of the materials for the position of the Curie point on the temperature scale, largely determined by the tilting action of the depolarizing field and the compensating shielding effects, are given. View Full-Text
Keywords: ferroelectric nanocomposites; smart materials; phase transitions; dielectric properties ferroelectric nanocomposites; smart materials; phase transitions; dielectric properties
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Darinskii, B.; Sidorkin, A.; Sigov, A.; Popravko, N. Influence of Depolarizing Fields and Screening Effects on Phase Transitions in Ferroelectric Composites. Materials 2018, 11, 85.

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