Effects of Na/K evaporation on electrical properties and intrinsic defects in Na0.5K0.5NbO3 ceramics

Laijun Liu; Huiqing Fan; Liang Fang; Xiuli Chen; Hichem Dammak; Mai Pham Thi

doi:10.1016/j.matchemphys.2009.05.024

Effects of Na/K evaporation on electrical properties and intrinsic defects in Na_0.5K_0.5NbO₃ ceramics

Laijun Liu, Huiqing Fan, Liang Fang, Xiuli Chen, Hichem Dammak, Mai Pham Thi

材料学院

科研成果: 期刊稿件 › 文章 › 同行评审

103 引用（Scopus）

摘要

The intrinsic defects of (Na_0.5K_0.5)NbO₃ (NKN) ceramics fabricated by high-energy ball-milling have been studied. In order to obtain the different amounts of Na/K evaporation, NKN ceramics were sintered in air (NKN exposed samples) and in calcined NKN powder (NKN buried samples), respectively. Compared with the dielectric and piezoelectric properties of the buried samples, the exposed samples exhibited a donor doped behavior at room temperature. A dielectric relaxation, induced by intrinsic oxygen vacancies, was detected in paraelectric phase region. The activity energies of intrinsic oxygen vacancies are 1.04 eV and 1.47 eV for the exposed samples and buried samples, respectively. The difference of activity energies resulted from singly ionized oxygen vacancies translating into doubly ionized oxygen vacancies with the increase of Na/K evaporation.

源语言	英语
页（从-至）	138-141
页数	4
期刊	Materials Chemistry and Physics
卷	117
期	1
DOI	https://doi.org/10.1016/j.matchemphys.2009.05.024
出版状态	已出版 - 15 9月 2009

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10.1016/j.matchemphys.2009.05.024

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title = "Effects of Na/K evaporation on electrical properties and intrinsic defects in Na0.5K0.5NbO3 ceramics",

abstract = "The intrinsic defects of (Na0.5K0.5)NbO3 (NKN) ceramics fabricated by high-energy ball-milling have been studied. In order to obtain the different amounts of Na/K evaporation, NKN ceramics were sintered in air (NKN exposed samples) and in calcined NKN powder (NKN buried samples), respectively. Compared with the dielectric and piezoelectric properties of the buried samples, the exposed samples exhibited a donor doped behavior at room temperature. A dielectric relaxation, induced by intrinsic oxygen vacancies, was detected in paraelectric phase region. The activity energies of intrinsic oxygen vacancies are 1.04 eV and 1.47 eV for the exposed samples and buried samples, respectively. The difference of activity energies resulted from singly ionized oxygen vacancies translating into doubly ionized oxygen vacancies with the increase of Na/K evaporation.",

keywords = "Ceramics, Defects, Dielectric properties, Evaporation",

author = "Laijun Liu and Huiqing Fan and Liang Fang and Xiuli Chen and Hichem Dammak and Thi, {Mai Pham}",

year = "2009",

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T1 - Effects of Na/K evaporation on electrical properties and intrinsic defects in Na0.5K0.5NbO3 ceramics

AU - Liu, Laijun

AU - Fan, Huiqing

AU - Fang, Liang

AU - Chen, Xiuli

AU - Dammak, Hichem

AU - Thi, Mai Pham

PY - 2009/9/15

Y1 - 2009/9/15

N2 - The intrinsic defects of (Na0.5K0.5)NbO3 (NKN) ceramics fabricated by high-energy ball-milling have been studied. In order to obtain the different amounts of Na/K evaporation, NKN ceramics were sintered in air (NKN exposed samples) and in calcined NKN powder (NKN buried samples), respectively. Compared with the dielectric and piezoelectric properties of the buried samples, the exposed samples exhibited a donor doped behavior at room temperature. A dielectric relaxation, induced by intrinsic oxygen vacancies, was detected in paraelectric phase region. The activity energies of intrinsic oxygen vacancies are 1.04 eV and 1.47 eV for the exposed samples and buried samples, respectively. The difference of activity energies resulted from singly ionized oxygen vacancies translating into doubly ionized oxygen vacancies with the increase of Na/K evaporation.

AB - The intrinsic defects of (Na0.5K0.5)NbO3 (NKN) ceramics fabricated by high-energy ball-milling have been studied. In order to obtain the different amounts of Na/K evaporation, NKN ceramics were sintered in air (NKN exposed samples) and in calcined NKN powder (NKN buried samples), respectively. Compared with the dielectric and piezoelectric properties of the buried samples, the exposed samples exhibited a donor doped behavior at room temperature. A dielectric relaxation, induced by intrinsic oxygen vacancies, was detected in paraelectric phase region. The activity energies of intrinsic oxygen vacancies are 1.04 eV and 1.47 eV for the exposed samples and buried samples, respectively. The difference of activity energies resulted from singly ionized oxygen vacancies translating into doubly ionized oxygen vacancies with the increase of Na/K evaporation.

KW - Ceramics

KW - Defects

KW - Dielectric properties

KW - Evaporation

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DO - 10.1016/j.matchemphys.2009.05.024

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VL - 117

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JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

IS - 1

ER -

Effects of Na/K evaporation on electrical properties and intrinsic defects in Na0.5K0.5NbO3 ceramics

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Effects of Na/K evaporation on electrical properties and intrinsic defects in Na_0.5K_0.5NbO₃ ceramics