晶粒状态对LiTaO_3电畴结构的影响  

EFFECT OF GRAIN STATE ON DOMAIN STRUCTURE IN LiTaO_3 GRAINS

作　　者：张有凤[1,2] 周玉[2] 贾德昌[2] 孟庆昌[2] 

机构地区：[1]上海工程技术大学材料工程学院,上海201620 [2]哈尔滨工业大学特种陶瓷研究所,哈尔滨150001

出　　处：《陶瓷学报》2010年第1期16-19,共4页Journal of Ceramics

基　　金：上海市高校培养优秀青年教师科研专项基金(编号:gjd08016);上海市重点学科建设项目(编号:J51402)

摘　　要：通过TEM技术研究了Al2O3/LiTaO3陶瓷复合材料中LiTaO3颗粒内的电畴结构,并将LiTaO3单晶、LiTaO3作为基体和LiTaO3作为第二相时其晶粒内的电畴结构进行比较。观察表明:纯LiTaO3陶瓷内的电畴结构基本上为曲流状180°电畴,也有非常少量的非180°电畴;15ALT陶瓷复合材料可看出LiTaO3晶粒内非180°电畴明显增多,且板条状与尖劈状两种状态都存在,但其中曲流状180°电畴明显可见;30ALT陶瓷复合材料中,只有少量的曲流状180°电畴,其中非180°电畴是这几个组分中数量最多、分布最密集的。LiTaO3晶粒内部电畴的形成与周围颗粒对其约束产生的应力有关。Domain structures in LiTaO3 grains in Al2O3/LiTaO3 composite ceramics were investigated systematically by TEM. Domain structures in LiTaO3 crystal, LiTaO3 as matrix and LiTaO3 as second phase were investigated. The results show that dagger-shaped 180°domain structures mainly occurred in LiTaO3 single crystal, and only a few non-180°domain structures were present. Wedge- and band-shaped non-180° domain structures significantly increased, and dagger-shaped 180° domain structures were also found in 15ALT composite ceramics. Only a few 180°domain structures were found in 30ALT composite ceramics, and domain quantity, density of non-180° domain structures were the highest. The formation of domain structures in LiTaO3 grains are related to the stress around LiTaO3 grains produced by Al2O3 grains.

关 键 词：LITAO3 AL2O3 电畴结构 陶瓷复合材料 

分 类 号：TQ174.75[化学工程—陶瓷工业]