Dielectric relaxation in alumina based ceramics studied by thermally stimulated depolarization current method

Peng Zhang; Chuang Zhang; Chun Zhao; Shihang Wang; Jianying Li; Haiyun Jin; Hao Zhang; Junyong Lu

doi:10.1016/j.scriptamat.2017.06.023

Dielectric relaxation in alumina based ceramics studied by thermally stimulated depolarization current method

Peng Zhang
, Chuang Zhang
, Chun Zhao
, Shihang Wang
, Jianying Li
, Haiyun Jin
, Hao Zhang
, Junyong Lu

School of Electrical Engineering

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

3 Scopus citations

Abstract

Thermally stimulated depolarization currents (TSDC) method was used to investigate the dielectric relaxation processes in alumina based ceramics. TSDC of 99% purity alumina ceramics (A99) and zirconia toughened alumina ceramics (ZTA) with varied polarization electric fields and polarization temperatures were studied. Measurement results show that the TSDC was induced by dipole relaxation. The dipole in A99 ceramics consists of a substitutional Mg^2 + ion and a trapped hole on one of the nearest oxygen ions. And the dipole in ZTA ceramics is defect association of Y_Zr^' − V_O^•• − Y_Zr^'. The orientation of defect dipoles was due to the hopping of oxygen vacancies.

Original language	English
Pages (from-to)	134-138
Number of pages	5
Journal	Scripta Materialia
Volume	139
DOIs	https://doi.org/10.1016/j.scriptamat.2017.06.023
State	Published - Oct 2017

Keywords

Defect association
Dielectric relaxation
Thermally stimulated depolarization current
Zirconia toughened alumina

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10.1016/j.scriptamat.2017.06.023

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title = "Dielectric relaxation in alumina based ceramics studied by thermally stimulated depolarization current method",

abstract = "Thermally stimulated depolarization currents (TSDC) method was used to investigate the dielectric relaxation processes in alumina based ceramics. TSDC of 99\% purity alumina ceramics (A99) and zirconia toughened alumina ceramics (ZTA) with varied polarization electric fields and polarization temperatures were studied. Measurement results show that the TSDC was induced by dipole relaxation. The dipole in A99 ceramics consists of a substitutional Mg2 + ion and a trapped hole on one of the nearest oxygen ions. And the dipole in ZTA ceramics is defect association of YZr' − VO•• − YZr'. The orientation of defect dipoles was due to the hopping of oxygen vacancies.",

keywords = "Defect association, Dielectric relaxation, Thermally stimulated depolarization current, Zirconia toughened alumina",

author = "Peng Zhang and Chuang Zhang and Chun Zhao and Shihang Wang and Jianying Li and Haiyun Jin and Hao Zhang and Junyong Lu",

note = "Publisher Copyright: {\textcopyright} 2016",

year = "2017",

month = oct,

doi = "10.1016/j.scriptamat.2017.06.023",

language = "英语",

volume = "139",

pages = "134--138",

journal = "Scripta Materialia",

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publisher = "Acta Materialia Inc",

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TY - JOUR

T1 - Dielectric relaxation in alumina based ceramics studied by thermally stimulated depolarization current method

AU - Zhang, Peng

AU - Zhang, Chuang

AU - Zhao, Chun

AU - Wang, Shihang

AU - Li, Jianying

AU - Jin, Haiyun

AU - Zhang, Hao

AU - Lu, Junyong

PY - 2017/10

Y1 - 2017/10

N2 - Thermally stimulated depolarization currents (TSDC) method was used to investigate the dielectric relaxation processes in alumina based ceramics. TSDC of 99% purity alumina ceramics (A99) and zirconia toughened alumina ceramics (ZTA) with varied polarization electric fields and polarization temperatures were studied. Measurement results show that the TSDC was induced by dipole relaxation. The dipole in A99 ceramics consists of a substitutional Mg2 + ion and a trapped hole on one of the nearest oxygen ions. And the dipole in ZTA ceramics is defect association of YZr' − VO•• − YZr'. The orientation of defect dipoles was due to the hopping of oxygen vacancies.

AB - Thermally stimulated depolarization currents (TSDC) method was used to investigate the dielectric relaxation processes in alumina based ceramics. TSDC of 99% purity alumina ceramics (A99) and zirconia toughened alumina ceramics (ZTA) with varied polarization electric fields and polarization temperatures were studied. Measurement results show that the TSDC was induced by dipole relaxation. The dipole in A99 ceramics consists of a substitutional Mg2 + ion and a trapped hole on one of the nearest oxygen ions. And the dipole in ZTA ceramics is defect association of YZr' − VO•• − YZr'. The orientation of defect dipoles was due to the hopping of oxygen vacancies.

KW - Defect association

KW - Dielectric relaxation

KW - Thermally stimulated depolarization current

KW - Zirconia toughened alumina

UR - https://www.scopus.com/pages/publications/85021298942

U2 - 10.1016/j.scriptamat.2017.06.023

DO - 10.1016/j.scriptamat.2017.06.023

M3 - 文章

AN - SCOPUS:85021298942

SN - 1359-6462

VL - 139

SP - 134

EP - 138

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Dielectric relaxation in alumina based ceramics studied by thermally stimulated depolarization current method

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Keywords

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