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Effect of cooling rate on phase transitions and ferroelectric properties in 0.75BiFeO 3 -0.25BaTiO 3 ceramics

The effect of the cooling rate on the electrical properties was investigated in the 0.75BiFeO 3 -0.25BaTiO 3 ceramics. The air-quenched samples had superior ferroelectric and piezoelectric properties to the slowly cooled samples. The quenching effect weakened when the quenching temperature was less... Full description

Journal Title: Applied Physics Letters 14 November 2016, Vol.109(20)
Main Author: Kim, Dae Su
Other Authors: Cheon, Chae Il , Lee, Seong Su , Kim, Jeong Seog
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0003-6951 ; E-ISSN: 1077-3118 ; DOI: 10.1063/1.4967742
Link: http://dx.doi.org/10.1063/1.4967742
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recordid: aip_complete10.1063/1.4967742
title: Effect of cooling rate on phase transitions and ferroelectric properties in 0.75BiFeO 3 -0.25BaTiO 3 ceramics
format: Article
creator:
  • Kim, Dae Su
  • Cheon, Chae Il
  • Lee, Seong Su
  • Kim, Jeong Seog
subjects:
  • Dielectrics, Ferroelectrics, And Multiferroics
ispartof: Applied Physics Letters, 14 November 2016, Vol.109(20)
description: The effect of the cooling rate on the electrical properties was investigated in the 0.75BiFeO 3 -0.25BaTiO 3 ceramics. The air-quenched samples had superior ferroelectric and piezoelectric properties to the slowly cooled samples. The quenching effect weakened when the quenching temperature was less than 700 °C and eventually disappeared at 500 °C and below. The X-ray diffraction and transmission electron microscopy showed that the cooling rate had a significant effect on the crystal structure and domain structure. The slowly cooled sample showed a very small rhombohedral distortion and a poorly developed domain structure, which leads to weak ferroelectric and piezoelectric properties at room temperature. The quenched and slowly cooled samples had a ferroelectric rhombohedral structure ( R3c ) at room temperature and a paraelectric cubic structure ( Pm-3m ) at temperatures above 650 °C. On the other hand, the slowly cooled sample had a centro-symmetric orthorhombic ( Pbnm ) structure at intermediate temperatures, while the quenched sample had a noncentrosymmetric orthorhombic structure ( Amm2 ). The diffusion of oxygen vacancies in the slowly cooled sample is believed to lead to a more symmetric orthorhombic structure at intermediate temperatures between 500 °C and 650 °C during the slow-cooling process and consequently very small rhombohedral distortion at room temperature.
language: eng
source:
identifier: ISSN: 0003-6951 ; E-ISSN: 1077-3118 ; DOI: 10.1063/1.4967742
fulltext: fulltext
issn:
  • 0003-6951
  • 1077-3118
  • 00036951
  • 10773118
url: Link


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titleEffect of cooling rate on phase transitions and ferroelectric properties in 0.75BiFeO 3 -0.25BaTiO 3 ceramics
creatorKim, Dae Su ; Cheon, Chae Il ; Lee, Seong Su ; Kim, Jeong Seog
ispartofApplied Physics Letters, 14 November 2016, Vol.109(20)
subjectDielectrics, Ferroelectrics, And Multiferroics
descriptionThe effect of the cooling rate on the electrical properties was investigated in the 0.75BiFeO 3 -0.25BaTiO 3 ceramics. The air-quenched samples had superior ferroelectric and piezoelectric properties to the slowly cooled samples. The quenching effect weakened when the quenching temperature was less than 700 °C and eventually disappeared at 500 °C and below. The X-ray diffraction and transmission electron microscopy showed that the cooling rate had a significant effect on the crystal structure and domain structure. The slowly cooled sample showed a very small rhombohedral distortion and a poorly developed domain structure, which leads to weak ferroelectric and piezoelectric properties at room temperature. The quenched and slowly cooled samples had a ferroelectric rhombohedral structure ( R3c ) at room temperature and a paraelectric cubic structure ( Pm-3m ) at temperatures above 650 °C. On the other hand, the slowly cooled sample had a centro-symmetric orthorhombic ( Pbnm ) structure at intermediate temperatures, while the quenched sample had a noncentrosymmetric orthorhombic structure ( Amm2 ). The diffusion of oxygen vacancies in the slowly cooled sample is believed to lead to a more symmetric orthorhombic structure at intermediate temperatures between 500 °C and 650 °C during the slow-cooling process and consequently very small rhombohedral distortion at room temperature.
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descriptionThe effect of the cooling rate on the electrical properties was investigated in the 0.75BiFeO 3 -0.25BaTiO 3 ceramics. The air-quenched samples had superior ferroelectric and piezoelectric properties to the slowly cooled samples. The quenching effect weakened when the quenching temperature was less than 700 °C and eventually disappeared at 500 °C and below. The X-ray diffraction and transmission electron microscopy showed that the cooling rate had a significant effect on the crystal structure and domain structure. The slowly cooled sample showed a very small rhombohedral distortion and a poorly developed domain structure, which leads to weak ferroelectric and piezoelectric properties at room temperature. The quenched and slowly cooled samples had a ferroelectric rhombohedral structure ( R3c ) at room temperature and a paraelectric cubic structure ( Pm-3m ) at temperatures above 650 °C. On the other hand, the slowly cooled sample had a centro-symmetric orthorhombic ( Pbnm ) structure at intermediate temperatures, while the quenched sample had a noncentrosymmetric orthorhombic structure ( Amm2 ). The diffusion of oxygen vacancies in the slowly cooled sample is believed to lead to a more symmetric orthorhombic structure at intermediate temperatures between 500 °C and 650 °C during the slow-cooling process and consequently very small rhombohedral distortion at room temperature.
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abstractThe effect of the cooling rate on the electrical properties was investigated in the 0.75BiFeO 3 -0.25BaTiO 3 ceramics. The air-quenched samples had superior ferroelectric and piezoelectric properties to the slowly cooled samples. The quenching effect weakened when the quenching temperature was less than 700 °C and eventually disappeared at 500 °C and below. The X-ray diffraction and transmission electron microscopy showed that the cooling rate had a significant effect on the crystal structure and domain structure. The slowly cooled sample showed a very small rhombohedral distortion and a poorly developed domain structure, which leads to weak ferroelectric and piezoelectric properties at room temperature. The quenched and slowly cooled samples had a ferroelectric rhombohedral structure ( R3c ) at room temperature and a paraelectric cubic structure ( Pm-3m ) at temperatures above 650 °C. On the other hand, the slowly cooled sample had a centro-symmetric orthorhombic ( Pbnm ) structure at intermediate temperatures, while the quenched sample had a noncentrosymmetric orthorhombic structure ( Amm2 ). The diffusion of oxygen vacancies in the slowly cooled sample is believed to lead to a more symmetric orthorhombic structure at intermediate temperatures between 500 °C and 650 °C during the slow-cooling process and consequently very small rhombohedral distortion at room temperature.
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