以氨水作为矿化剂,硝酸钇为原料,利用低温水热法合成棒状纳米晶和微米晶.进一步利用XRD、SEM、TEM对水热合成产物进行了表征.研究结果表明,在pH值=9、水热合成温度80℃、反应时间为4h时得到低结晶度的片状水合氧化钇纳米晶.随水热反应的进行,无定形水合硝酸氧钇在高温高压条件下开始结晶形成Y2(OH)5(NO3)·H2O,随着水热反应温度和压力的进一步升高,组成由Y2(OH)5(NO3)·H2O逐渐向Y4O(OH)9(NO3)转变.当合成温度升高到180℃,合成了结晶度完好的水合硝酸氧钇棒型微米晶.经过600℃的热处理成功得到了棒状结构的氧化钇.水热条件下不同形貌水合硝酸氧钇的生长过程遵循溶解-再结晶机制,并且存在重结晶生长.
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