利用原子力显微镜低频声学模式观察氧化锌压敏电阻陶瓷晶界处纳米尺度弹性响应(英文)  

Nanoscale Elastic Response of Grain Boundaries in ZnO Varistors by Acoustic Mode AFM

作　　者：赵坤宇[1,2] 曾华荣[1] 宋红章[1,2] 程丽红[1,2] 曾江涛[1] 蔡闻捷[1] 惠森兴[1] 李国荣[1] 殷庆瑞[1] 

机构地区：[1]中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室,上海200050 [2]中国科学院研究生院,北京100049

出　　处：《无机材料学报》2009年第4期869-872,共4页Journal of Inorganic Materials

基　　金：National High-Technology Research &Development Program of China (2007AA03Z330);National Key Development Programfor Basic Research of China(2009CB623305);Foundation for Innovative Research Groups of the National Natural ScienceFoundation of China (50821004);National Science Foundation of China (10774113;10876041);Nanotechnology Project of Shanghai Science and Technology Committee (0852nm06900)

摘　　要：介绍在商用原子力显微镜上建立的低频声学成像模式,并利用其对氧化锌压敏电阻陶瓷晶界处进行了弹性性能成像.声学像中晶界处微晶的衬度反映了添加物的分布.而晶界处的衬度增强现象可能说明样品经热处理后发生富铋相的相变.结果显示低频声成像的分辨率达到了纳米量级,在功能材料的微区力学性能表征方面具有良好的应用前景.Low-frequency acoustic mode atomic force microscopy was successfully developed based on the commercial AFM.The experimental results on nanometer scale elastic response at the grain boundaries in ZnO varistors assessed by the technique were presented.Different acoustic contrast of the individual micro-grains at grain boundaries were examined which reflected the distribution of additives.The acoustic contrasts enhanced at the grain boundaries can be observed clearly,which present possibility of crystal lattice expanding of Bi-rich phase caused by phase transition in the heat treatment.The lateral resolution of acoustic image is down to nanometer scale.The results show the application perspective of low-frequency scanning probe acoustic microscopy in functional materials at submicro- or nanometer scale.

关 键 词：扫描探针显微术 声成像 微区弹性 氧化锌 晶界 

分 类 号：TG115[金属学及工艺—物理冶金]