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725 ℃下托贝莫来石的结构和表面形貌变化
作者:胡彪1?崔崇1?崔晓昱1?秦娟1?马海龙2?
单位:1.?南京理工大学材料科学与工程学院?南京?210094?2.?宁夏大学民族预科教育学院?银川?750021?
关键词:托贝莫来石?脱羟基托贝莫来石?单斜链状硅灰石?煅烧?
分类号:O 76
出版年,卷(期):页码:2015,43(2):15-16
DOI:10.7521/j.issn.0454-5648.2015.02.16
摘要:

?利用微米尺度、无定形二氧化硅与氧化钙制备层间距d(002)为1.13 nm的托贝莫来石,研究了托贝莫来石高温煅烧过程中的结构变化和在725 ℃的微结构变化规律。结果表明:托贝莫来石经过725 ℃煅烧2 h后会转变为一种无定型的亚稳状态结构,即脱羟基托贝莫来石;725 ℃煅烧2 h后,部分托贝莫来石形成类单斜链状的硅灰石结构(结晶态)和脱羟基托贝莫来石(无定形态);这种无定型的亚稳状态结构的外貌和托贝莫来石的晶体外貌相似,都是针状、片状的晶体,和大量由片状与针状堆积形成的颗粒状结构,这些颗粒状结构由针状、片状结构互相交错堆积形成;在725 ℃煅烧温度下,部分微米、亚微米尺度的托贝莫来石转变为单斜链状的硅灰石结构。

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?Tobermorite with basal spacing (d(002)) of 1.13 nm was synthesized with submicron-sized amorphous silicon dioxide and calcium oxide. The structure and morphology changes of tobermorite calcined at 725 ℃ for 2 h were investigated. The results show that dehydroxylation tobermorite and monoclinic α-CaSiO3 crystals appear after calcination. The dehydroxylation tobermorite is amorphous, disordered and metastable. The morphology of calcined tobermorite is similar to that of uncalcined tobermorite, i.e., needle-like and lamellar, due to the lamellar twining and accumulative generation of the particles. Some submicron-sized tobermorite crystals transform into monoclinic α-CaSiO3 crystals after calcination at 725 ℃ for 2 h.

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基金项目:
基金项目:科技重大专项(2012ZX04010032);(51468053)国家自然科学基金。
作者简介:
第一作者:胡 彪(1991—),男,硕士研究生。 通信作者:崔 崇(1957—),男,硕士,教授。
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参考文献:

?References:

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