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Al_2O_3基陶瓷复合材料中LiTaO_3颗粒内的电畴结构
作者:刘艳改 周玉 贾德昌 
单位:清华大学机械工程系 哈尔滨工业大学材料科学与工程学院 哈尔滨工业大学材料科学与工程学院 北京 100084 哈尔滨工业大学材料科学与工程学院 哈尔滨 150001  哈尔滨 150001  哈尔滨 150001 
关键词:钽酸锂  氧化铝  电畴结构  陶瓷复合材料  透射电子显微镜 
分类号:TB33
出版年,卷(期):页码:2003,31(12):1135-1139
DOI:
摘要:
采用TEM技术对Al2O3基陶瓷复合材料中LiTaO3颗粒内的电畴结构进行了研究。结果表明:LiTaO3单晶中不可能形成的90°畴出现在LiTaO3/Al2O3(简称LTA)陶瓷复合材料中的LiTaO3晶粒内,且以其为主,这对于六方结构的LiaO3来说,是一个新的发现。采用不同烧结方法制备的LTA陶瓷复合材料中LiTaO3晶粒内的电畴结构有很大差别。1500℃热压烧结,LTA陶瓷复合材料中LiTaO3晶粒内的电畴结构主要为高密度的薄片状90°畴以及箭尾型90°畴;200 MPa冷等静压成型后经1300℃无压烧结,LTA中LiTaO3晶粒内除了薄片状与箭尾型的90°畴结构外,还形成了尖劈状与板条状的90°畴结构;1 300℃热压烧结,LTA中LiTaO3晶粒内的电畴结构大多为板条状的90°畴,另外还有少量尖劈状的90°畴。LiTaO3晶粒内部电畴结构的不同与LiTaO3晶粒受周围Al2O3基体晶粒的应力作用、LiTaO3的化学组成配比以及薄膜试样制备过程中的机械研磨抛光有关。
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Domain structures in LiTaO3 particles dispersed in Al2O3 matrix ceramic composite were investigated systematically using TEM technique. The results show that 90?domain structures are mainly occurred in LiTaO3 grains in LiTaQ3 / Al2 O3 (denoted by LTA) ceramic composite, which is impossible in LiTaO3 single crystal. This is a new discovery for hexagonal LiTaO3. Domain structures in LiTaO3 grains vary greatly in LTA ceramic composite fabricated by different sintering methods. The influencing factors of domain structures are also discussed. Domain structures in LiTaO3 grains in LTA fabricated by hot-pressing at 1 500℃ are mainly lamellar 90° domains of high density and herring-bone 90° domains. Besides lamellar and herring-bone 90° domains, wedge and banded shaped 90° domains are also found in LiTaO3 grains in LTA prepared by cold isostat-ic pressing under a pressure of 200 MPa followed by pressureless sintering at 1 300℃. Most banded shaped 90° domains and a few of wedge shaped 90° domains are observed in LTA hot-pressed at 1 300℃. The differences of domain structures in LiTaO3 grains are related with the stress round LiTaO3 grains acted by Al2 O3 grains, the chemical composition of LiTaO3 and mechanical grinding and polishing in the process of fabricating specimens.
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基金项目:
国家自然科学基金(59972006)资助项目
作者简介:
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