三氧化钨陶瓷非线性伏安特性研究  

Study on the nonlinear I-V characteristics of tungsten trioxide ceramics

作　　者：花中秋[1] 王海庆[2] 赵洪旺[2] 董亮[1] 王豫[1] 

机构地区：[1]西南交通大学电气工程学院,四川成都610031 [2]西南交通大学材料科学与工程学院,四川成都610031

出　　处：《功能材料》2010年第8期1343-1346,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50772092)

摘　　要：采用传统陶瓷工艺制备了三氧化钨(WO3)陶瓷,研究了淬火工艺和气氛条件下热处理对WO3陶瓷非线性特性的影响。XRD和SEM微结构分析显示,陶瓷样品经不同气氛下的热处理后,微结构特征没有发生变化;电学测量表明,陶瓷样品的电学特性发生了显著的变化,高温下淬火和淬火后在N2,Ar气氛条件处理的样品,表现出线性小电阻行为,而正常烧结和在富氧条件下处理的淬火样品则呈现出明显的非线性行为。根据实验结果认为,WO3陶瓷非线性特性可能起源于陶瓷冷却过程中,晶粒内外非平衡缺陷形成和迁移而产生的晶界势垒。Undoped tungsten trioxide （WO3） ceramics were prepared by conventional electroceramic technique and effects of quenching and different thermal treatments on the nonlinear I-V characteristics of WO3 ceramics have been investigated. Microstructure analysis by XRD and SEM revealed that there were no obvious differences observed in samples with different thermal annealing atmospheres,however,electrical characterization showed significant changes in the electrical properties. Ceramics quenching in high temperatures and annealing in the Nitrogen showed no nonlinear property and the as sintered and quenched ceramics thermal treatments in the air and oxygen showed distinct nonlinear behavior. Based on the experimental results,it is proposed that nonlinear I-V characteristics of WO3 ceramic may be formed by the potential barriers,resulted from the non-equilibrium defect chemistry process,arising in the cooling period of sintering.

关 键 词：WO3陶瓷 非线性 势垒 

分 类 号：TN304[电子电信—物理电子学]