| BaTiO3基PTCR气敏陶瓷的晶界化学研究 |
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| 引用本文： | 周志刚,唐子龙,张中太.BaTiO3基PTCR气敏陶瓷的晶界化学研究[J].无机材料学报,2004,19(3):571-578. |
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| 作者姓名： | 周志刚 唐子龙 张中太 |
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| 作者单位： | 清华大学材料科学与工程系新型陶瓷与精细工艺国家重点实验室,北京,100084 |
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| 基金项目： | 国家自然科学基金(59672012) |
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| 摘 要： | 陶瓷化学传感器的敏感机制与晶界的化学缺陷结构在周围微环境下的变异密切相关．晶粒表面和晶界是空位源，研究陶瓷材料在环境气氛中晶界化学缺陷的变化，对于探索陶瓷材料的敏感机制和开拓新应用具有重要意义．本文就BaTiO3基PTCR陶瓷中本征缺陷的生成和分布，缺陷在高温冻结、吸附和脱附过程中的变化，缺陷的重分布及其对晶界势垒的贡献进行深入的讨论．
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| 关 键 词： | BaTiO3 PTCR陶瓷 晶界 缺陷 CO气敏 |
| 文章编号： | 1000-324X(2004)03-0571-08 |
| 收稿时间： | 2003-11-6 |
| 修稿时间： | 2003-12-24 |
Grain-Boundary Chemistry of BaTiO3 based PTCR Ceramics as CO Gas Sensors |
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| ZHOU Zhi-Gang,TANG Zi-Long,ZHANG Zhong-Tai.Grain-Boundary Chemistry of BaTiO3 based PTCR Ceramics as CO Gas Sensors[J].Journal of Inorganic Materials,2004,19(3):571-578. |
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| Authors: | ZHOU Zhi-Gang TANG Zi-Long ZHANG Zhong-Tai |
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| Affiliation: | StateKeyLaboratoryofFineCeramicsandNewProcessing;DepartmentofMaterialsScienceandEngineering;TsinghuaUniversity;Beijing100084;China |
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| Abstract: | The sensing phenomena and mechanism of doped BaTiO_3 based PTCR ceramics for
chemical sensors are close related to the variation of chemical defect structure in the grain bound-
aries with environmental atmospheres. The surfaces and grain boundaries are act as a uniform
source and sink for vacancies, and the lattice defects play a positive role for the sensing effect in the
ceramics. The grain boundary Chemistry, specially, formation and distribution of defects, defect
changes in adsorption and desorption process with surrounding CO gas, redistribution of electrons
on quenching to room temperature for high dopant concentrations as well as potential barrier in
grain boundary were discussed. |
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| Keywords: | BaTiO_3 PTCR ceramics grain boundary defect CO gas sensor |
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