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OALib Journal期刊
ISSN: 2333-9721
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片状srtio3晶体的合成及其反应机理
DOI: 10.3969/j.issn.1671-7627.2007.03.003, PP. 13-19
Keywords: 熔盐法,sr3ti2o7,srtio3,片状晶体
Abstract:
采用熔盐法分两步合成了片状srtio3晶体.研究了合成温度、熔盐种类对sr3ti2o7前驱体以及片状srtio3晶体形貌和尺寸的影响.在第1步过程中,低温下,首先生成亚微米级立方srtio3颗粒,随着温度的升高,srtio3颗粒逐渐生长成片状sr3ti2o7晶体.在第2步过程中,随着温度的提高,片状sr3ti2o7前驱体逐渐转变为片状srtio3晶体.熔盐的选择对片状srtio3晶体的最终形貌、尺寸有着显著的影响.以kcl作为熔盐,在1200℃下合成的片状srtio3晶体边长为10～15μm,而使用nacl所得srtio3晶体边长为30～50μm,宽厚比最高达到25∶1.片状srtio3晶体的形成机理是在高温条件下,由于熔盐中tio2的作用,sr3ti2o7晶体中岩盐结构的sro层被破坏,并以sr2+、o2-形式溶出,剩余的srtio3结构重新叠合联结,产物基本保持原来sr3ti2o7片状晶体的外形,溶出的sr2+、o2-与熔体中的tio2反应生成srtio3.
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