Investigation of Improved Reliability in BaTiO3-Based Ceramics via Two-Step Sintering by Impedance Spectroscopy and Schottky Barrier Model

被引：8
作者：
Zhao, Qiancheng [1 ]
Gong, Huiling [1 ]
Wang, Xiaohui [1 ]
Li, Longtu [1 ]
机构：
[1] Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
来源：
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE | 2018年 / 215卷 / 18期
基金：
中国国家自然科学基金;
关键词：
barium titanate; impedance spectroscopy; reliability; Schottky barrier model; two-step sintering; DC-ELECTRICAL DEGRADATION; BARIUM-TITANATE CERAMICS; CONSTANT GRAIN-SIZE; RESISTANCE DEGRADATION; CONDUCTIVITY; ELECTRODES; CAPACITORS; MECHANISM; BEHAVIOR; CHARGE;
D O I：
10.1002/pssa.201800168
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The ceramics prepared by conventional sintering (CS) method and two-step sintering (TSS) method are investigated in the temperature range of 490-570 degrees C through impedance spectroscopy, which is correlated with the improved reliability of TSS specimen. There is an improvement in the resistances (R-g and R-gb) of TSS specimen mainly due to the reduced grain size. And according to the grain boundary double Schottky barrier model, not merely the smaller potential barrier height (?(gb)) but also the larger depletion layer thickness ((gb)) for TSS specimen indicate that the effective concentration of charged acceptor dopants and hence oxygen vacancy concentration in TSS specimen are much lower than these in CS specimen. These facts can account for the improved reliability in BaTiO3-based ceramics via two-step sintering.
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页数：6
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