Abnormal electrocaloric effect of Na0.5Bi0.5TiO3-BaTiO3lead-free ferroelectric ceramics above room temperature

Yang Bai; Guangping Zheng; San-Qiang Shi

doi:10.1016/j.materresbull.2011.07.038

Abnormal electrocaloric effect of Na_0.5Bi_0.5TiO₃-BaTiO₃lead-free ferroelectric ceramics above room temperature

Yang Bai, Guangping Zheng, San-Qiang Shi

Research output: Journal article publication › Journal article › Academic research › peer-review

211 Citations (Scopus)

Abstract

We demonstrate the electrocaloric effect (ECE) of Na0.5Bi0.5TiO3-BaTiO3(NBT-BT) lead-free ferroelectric ceramics, which were fabricated by the solid-state reaction method. Based on a Maxwell relation, the ECE was characterized via P-T curves under different electric fields. The polarization of NBT increases monotonically within the temperature range of 25-145 °C. It indicates that the NBT has an abnormal ECE with a negative temperature change (ΔT140= -0.33 K at E = 50 kV/cm) opposite to that of the normal ferroelectrics. The 0.92NBT-0.08BT composition near the morphotropic phase boundary has a normal ECE under low electric fields and an abnormal ECE under high electric fields. The abnormal ECE character originates from the relaxor characteristic between ferroelectric and antiferroelectric phases, while the common ECE is always related to the normal ferroelectric-paraelectric phase transition.

Original language	English
Pages (from-to)	1866-1869
Number of pages	4
Journal	Materials Research Bulletin
Volume	46
Issue number	11
DOIs	https://doi.org/10.1016/j.materresbull.2011.07.038
Publication status	Published - 1 Nov 2011

Keywords

A. Ceramics
C. Differential scanning calorimetry
C. X-ray diffraction
D. Dielectric properties
D. Ferroelectricity

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

More information

10.1016/j.materresbull.2011.07.038

Cite this

@article{3cb0e09542d04828bbbc590c364968eb,

title = "Abnormal electrocaloric effect of Na0.5Bi0.5TiO3-BaTiO3lead-free ferroelectric ceramics above room temperature",

abstract = "We demonstrate the electrocaloric effect (ECE) of Na0.5Bi0.5TiO3-BaTiO3(NBT-BT) lead-free ferroelectric ceramics, which were fabricated by the solid-state reaction method. Based on a Maxwell relation, the ECE was characterized via P-T curves under different electric fields. The polarization of NBT increases monotonically within the temperature range of 25-145 °C. It indicates that the NBT has an abnormal ECE with a negative temperature change (ΔT140= -0.33 K at E = 50 kV/cm) opposite to that of the normal ferroelectrics. The 0.92NBT-0.08BT composition near the morphotropic phase boundary has a normal ECE under low electric fields and an abnormal ECE under high electric fields. The abnormal ECE character originates from the relaxor characteristic between ferroelectric and antiferroelectric phases, while the common ECE is always related to the normal ferroelectric-paraelectric phase transition.",

keywords = "A. Ceramics, C. Differential scanning calorimetry, C. X-ray diffraction, D. Dielectric properties, D. Ferroelectricity",

author = "Yang Bai and Guangping Zheng and San-Qiang Shi",

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T1 - Abnormal electrocaloric effect of Na0.5Bi0.5TiO3-BaTiO3lead-free ferroelectric ceramics above room temperature

AU - Bai, Yang

AU - Zheng, Guangping

AU - Shi, San-Qiang

PY - 2011/11/1

Y1 - 2011/11/1

N2 - We demonstrate the electrocaloric effect (ECE) of Na0.5Bi0.5TiO3-BaTiO3(NBT-BT) lead-free ferroelectric ceramics, which were fabricated by the solid-state reaction method. Based on a Maxwell relation, the ECE was characterized via P-T curves under different electric fields. The polarization of NBT increases monotonically within the temperature range of 25-145 °C. It indicates that the NBT has an abnormal ECE with a negative temperature change (ΔT140= -0.33 K at E = 50 kV/cm) opposite to that of the normal ferroelectrics. The 0.92NBT-0.08BT composition near the morphotropic phase boundary has a normal ECE under low electric fields and an abnormal ECE under high electric fields. The abnormal ECE character originates from the relaxor characteristic between ferroelectric and antiferroelectric phases, while the common ECE is always related to the normal ferroelectric-paraelectric phase transition.

AB - We demonstrate the electrocaloric effect (ECE) of Na0.5Bi0.5TiO3-BaTiO3(NBT-BT) lead-free ferroelectric ceramics, which were fabricated by the solid-state reaction method. Based on a Maxwell relation, the ECE was characterized via P-T curves under different electric fields. The polarization of NBT increases monotonically within the temperature range of 25-145 °C. It indicates that the NBT has an abnormal ECE with a negative temperature change (ΔT140= -0.33 K at E = 50 kV/cm) opposite to that of the normal ferroelectrics. The 0.92NBT-0.08BT composition near the morphotropic phase boundary has a normal ECE under low electric fields and an abnormal ECE under high electric fields. The abnormal ECE character originates from the relaxor characteristic between ferroelectric and antiferroelectric phases, while the common ECE is always related to the normal ferroelectric-paraelectric phase transition.

KW - A. Ceramics

KW - C. Differential scanning calorimetry

KW - C. X-ray diffraction

KW - D. Dielectric properties

KW - D. Ferroelectricity

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DO - 10.1016/j.materresbull.2011.07.038

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