Al_3(SO_4)_2(OH)_5H_2O与α-Al_2O_3晶须的制备及其生长机制  被引量:4

Synthesis and Growth Mechanism of Al_3(SO_4)_2(OH)_5H_2O and α-Al_2O_3 Whiskers

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作  者:吴健松[1] 张正贺[2] 林志仙[3] 

机构地区:[1]湛江师范学院化学科学与技术学院,湛江524048 [2]湛江师范学院物理科学与技术学院,湛江524048 [3]湛江师范学院生物科学与技术学院,湛江524048

出  处:《硅酸盐通报》2012年第6期1421-1424,共4页Bulletin of the Chinese Ceramic Society

基  金:国家自然科学基金(40976074)资助项目

摘  要:采用液相沉淀及烧结方法制备了Al3(SO4)2(OH)5H2O与α-Al2O3晶须,样品采用XRD、SEM及G-DTA等对样品物相、形貌及热行为进行了表征,结果表明晶须样品的分散性好,粒度分布均匀、表面光滑,Al3(SO4)2(OH)5H2O与α-Al2O3晶须品质优良。又从"生长基元"角度出发,讨论了Al3(SO4)2(OH)5H2O晶须的形成机制,其生长过程是生长基元是八面体[Al-(OH)6]3-与HSO4-往某一晶面稳定叠合生长的结果,Al3(SO4)2(OH)5H2O晶须经热分解后,其形貌不变,最终变为α-Al2O3晶须。The Al3(SO4)2(OH)5H2O and α-Al2O3 whiskers were synthesized by liquid precipitation reaction and sintering methods process.The phase,granularity,structure of crystal morphology of whiskers samples were characterized by X-ray difraction(XRD),scanning electron microscop(SEM) and thermal analysis(TG-DTA).The SEM reveales that the whiskers form with fine dispersive capability and the crystal form,good whisker qulity,as well as smooth suiface and that the distribution of particle size is uniformity.From the point of growth units,the growth mechanism of Al3(SO4)2(OH)5H2O whisker is investigated in this paper.The growth units of Al3(SO4)2(OH)5H2O whisker is [Al-(OH)6]3-,The growth process of whisker is as follows: [Al-(OH)6]3-and HSO-4 piles up towards one-dimensional direction and eventually forms whiskers.After thermal decomposition,the morphology of the same,Al3(SO4)2(OH)5H2O whiskers eventually became the α-Al2O3 whiskers.

关 键 词:Α-AL2O3 负离子配位多面体生长基元模型 晶须 

分 类 号:O78[理学—晶体学]

 

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