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

School of Materials Sience and Engineering

Research output: Contribution to journal › Article › peer-review

103 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	138-141
Number of pages	4
Journal	Materials Chemistry and Physics
Volume	117
Issue number	1
DOIs	https://doi.org/10.1016/j.matchemphys.2009.05.024
State	Published - 15 Sep 2009

Keywords

Ceramics
Defects
Dielectric properties
Evaporation

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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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doi = "10.1016/j.matchemphys.2009.05.024",

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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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U2 - 10.1016/j.matchemphys.2009.05.024

DO - 10.1016/j.matchemphys.2009.05.024

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AN - SCOPUS:67650263431

SN - 0254-0584

VL - 117

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EP - 141

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 Na_0.5K_0.5NbO₃ ceramics

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Keywords

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