Colossal permittivity and ultralow dielectric loss in Nb-doped SrTiO 3 ceramics

IF 18.6 1区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS
Jinghan Cai, Junlei Qi, Yueyang Yang, Xinyue Zhang, Yuan-Hua Lin
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引用次数: 0

Abstract

Defect engineering has been applied to prepare materials with modifiable dielectric properties. SrTiNbxO3 (x=0, 0.003, 0.006, 0.009, 0.012) ceramics were synthesized using the traditional solid-state reaction method and sintered in a reducing atmosphere. All samples show excellent dielectric properties with giant permittivity (>3.5×104) and low dielectric loss (<0.01). SrTiNb0.003O3 ceramic exhibits a colossal permittivity of 4.6×104 and an ultralow dielectric loss of 0.005 (1 kHz, room temperature) as well as great temperature stability in the range of -60~160℃. The mechanism of the presented CP properties is investigated by conducting XPS and analyzing activation energies. The results indicate that the introduction of Nb5+ and the reducing sintering atmosphere together generated the formation of Ti3+ and V ∙∙O. These defects further form Ti'TiV ∙∙OTi'Ti defect dipoles, contributing to the coexisting giant permittivity and low dielectric loss in STN ceramics.
铌掺杂srtio3陶瓷的巨大介电常数和超低介电损耗
缺陷工程已被应用于制备可改变介电性能的材料。采用传统固相反应法制备了SrTiNbxO3 (x= 0,0.003, 0.006, 0.009, 0.012)陶瓷,并在还原气氛中烧结。所有样品均具有优异的介电常数(>3.5×104)和低介电损耗(<0.01)。SrTiNb0.003O3陶瓷具有极高的介电常数4.6×104和0.005 (1 kHz,室温)的超低介电损耗,并在-60~160℃范围内具有良好的温度稳定性。通过XPS分析和活化能分析,探讨了CP性质的形成机理。结果表明:Nb5+的引入和还原烧结气氛共同促进了Ti3+和V∙∙O的生成;这些缺陷进一步形成Ti'Ti - V∙O - Ti'Ti缺陷偶极子,导致STN陶瓷中同时存在巨大介电常数和低介电损耗。
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来源期刊
Journal of Advanced Ceramics
Journal of Advanced Ceramics MATERIALS SCIENCE, CERAMICS-
CiteScore
21.00
自引率
10.70%
发文量
290
审稿时长
14 days
期刊介绍: Journal of Advanced Ceramics is a single-blind peer-reviewed, open access international journal published on behalf of the State Key Laboratory of New Ceramics and Fine Processing (Tsinghua University, China) and the Advanced Ceramics Division of the Chinese Ceramic Society. Journal of Advanced Ceramics provides a forum for publishing original research papers, rapid communications, and commissioned reviews relating to advanced ceramic materials in the forms of particulates, dense or porous bodies, thin/thick films or coatings and laminated, graded and composite structures.
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