CAJ | 학술논문

以硝酸铟为原料,用氨水做沉淀剂,采用水解沉淀–水热法制备In2O3的前驱体In(OH)3,用扫描电镜、X射线衍射仪及激光粒度分析仪对产物的结构、形貌和粒度进行表征.结果表明,水解沉淀产物为立方相In(OH)3,呈短棒状团聚体.水热处理过程中,产物的晶型、形貌和粒度受Ostwald熟化机制和相转化机制的影响.当水热温度低于280℃时,首先发生Ostwald熟化机制,In(OH)3颗粒形貌由短棒状转变为长方体,而物相不发生变化.当水热温度高于280℃时,除发生Ostwald熟化机制外,还存在相转化机制,产物形貌先由棒状转变为长方体,接着转变为多面体,且物相由立方相的In(OH)3转变为斜方相的InOOH.
이초산인위원료,용안수주침정제,채용수해침정–수열법제비In2O3적전구체In(OH)3,용소묘전경、X사선연사의급격광립도분석의대산물적결구、형모화립도진행표정.결과표명,수해침정산물위립방상In(OH)3,정단봉상단취체.수열처리과정중,산물적정형、형모화립도수Ostwald숙화궤제화상전화궤제적영향.당수열온도저우280℃시,수선발생Ostwald숙화궤제,In(OH)3과립형모유단봉상전변위장방체,이물상불발생변화.당수열온도고우280℃시,제발생Ostwald숙화궤제외,환존재상전화궤제,산물형모선유봉상전변위장방체,접착전변위다면체,차물상유립방상적In(OH)3전변위사방상적InOOH.
The precursor of In2O3 was prepared by hydrolysis precipitation-hydrothermal method using In(NO3)3 solution as raw material and ammonium hydroxide as neutralizing agent. The crystalline, morphology and size of the products were characterized by SEM, XRD, BET and Laser particle size analyzer. The results show that the hydrolysis product is the aggregate of cubic In(OH)3 with a short rod morphology. In the hydrothermal processes, the crystalline, morphology and particle size of the hydrothermal product are affected by the mechanisms of Ostwald ripening and phase transition. When temperature is less than 280 ℃, the mechanism of Ostwald ripening takes effect firstly, resulting in the morphology of particles change from short rods to cuboids. However, except for Ostwald ripening, the mechanism of phase transition also happens when temperature is higher than 280 ℃, the cubic phase of In(OH)3 transforms to rhombohedral phase of InOOH and the morphology changes from short rods to cuboids, and then to polyhedron.