摘要
采用共沉淀法制备了立方结构氢氧化铟(In(OH)3)和四方结构氧化铟氢氧化物(InOOH)2种前驱体。利用X射线衍射、热重和差热分析以及等温热处理,对立方结构In(OH)3和四方结构InOOH向萤石型结构铟锡氧化物(ITO)固溶体以及刚玉型结构ITO固溶体的相演变规律进行了系统的研究。立方结构In(OH)3向萤石型结构ITO固溶体的转变起始于150℃,在300℃左右转变完全并且表现为一种吸热行为。四方结构InOOH向刚玉型结构ITO固溶体转变起始于220℃并且终止于430℃。此外,四方结构InOOH向刚玉型结构ITO固溶体的转变包含2个子过程,一个表现为吸热行为的InOOH脱水过程,另一个表现为强烈放热行为的InOOH脱水产物向刚玉型结构ITO固溶体的转变过程。刚玉型结构ITO固溶体在空气中处于亚稳态,并且在加热的条件下可以转变为萤石型结构ITO固溶体。刚玉型结构ITO固溶体向萤石型结构ITO固溶体的转变起始于578℃,在800℃以前转变终止并且表现为一种弱吸热行为。
Two kinds of indium-tin oxide （ITO） precursors, cubic indium hydroxide （In（ OH）3 ） and orthorhombic indium oxide hydroxide （InOOH）, were prepared by a co-precipitation method. With the help of X-ray diffraction （XRD）, thermogravimetric analysis （TGA） and differential thermal analysis （DTA）, the phase evolution from cubic In（OH） 3 and orthorhombic InOOH to cubic ITO solid solution and rhombohedral ITO solid solution respectively by heattreatment had been systematically investigated. The transformation from cubic In（OH） 3 to cubic ITO solid solution started at 150℃ and ended at about 300℃, and it exhibited an endothermic behavior. The transformation from orthorhombic InOOH to rhombohedral ITO solid solution started at 220℃ and ended at about 430℃. Moreover, this transformation was composed of two processes ： one was the dehydration of InOOH exhibiting an endothermic behavior and another was the transformation from dehydration products to rhombohedral ITO solid solution exhibiting a strongly exothermic behavior. Rhombohedral ITO solid solution was metastable in air and it would be transformed to cubic ITO solid solution by heat-treatment. The transformation from rhombohedral ITO solid solution to cubic ITO solid solution started at 578℃ and ended below 800 ℃, and it exhibited a weakly endothermic behavior.
出处
《矿冶工程》
CAS
CSCD
北大核心
2006年第2期64-67,共4页
Mining and Metallurgical Engineering
