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非水解溶胶-凝胶法合成镁橄榄石纳米粉体
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摘要
以正硅酸乙酯和无水氯化镁为前驱体,以二氯甲烷为溶剂,采用非水解溶胶-凝胶法合成镁橄榄石纳米粉体。利用DSC-TG、XRD和FTUIR分析了凝胶热处理过程中的相变化。结果表明:当非水解凝胶加热到550℃有少量方镁石相出现,当650℃时开始生成镁橄榄石相,并伴随一定量的方镁石相,当煅烧温度为850℃时,析出的方镁石相减少,镁橄榄石进一步生成。FE-SEM分析表明,850℃合成的镁橄榄石粒径为50~100 nm。
引文
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