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AM_2O_8(A=Zr,Hf;M=Mo,W)氧化物粉体的低温 液相合成及其结构控制(英文)
作者:GEORGIChristian??
单位:伊尔梅瑙理工大学材料工艺研究所??
关键词:溶胶-凝胶合成??负热膨胀??钨酸锆??钼酸锆?
分类号:TB383.1
出版年,卷(期):页码:2009,37(5):667-674
DOI:
摘要:

立方AM2O8氧化物(A=Zr,Hf;M=Mo,W)是最有希望的一类负热膨胀材料。为开发这类材料,期望获得高质量AM2O8粉体,而传统固相合成法不能达到这一目的。低温液相合成法是一种有望合成高质量AM2O8氧化物粉体的途径。本文介绍了1998年以来低温液相合成AM2O8粉体的研究进展,首先,概述了AM2O7(OH)2·2H2O脱水的合成工艺,其后讨论了用于制备醇盐或羧酸盐前驱体的凝胶技术。着重讨论了材料结构控制问题,并提出了进一步研究方向。

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One of the most promising families of negative thermal expansion materials is that of cubic AM2O8 oxides(A=Zr,Hf;M=Mo,W).Potential applications have brought about a need for high-quality AM2O8 powders which cannot be fulfilled by conventional solid-state syntheses.The use of low-temperature solution-based methods is a promising alternative approach for the synthesis of AM2O8 oxides.The current paper reviews the research done in this area since 1998.First,the results of syntheses by the dehydration of AM2O7(OH)2?2H2O are summarized,followed by a discussion of gel techniques which make use of alkoxide or carboxylate precursors.Attention is then focused on the issue of structure control of the oxides.Future directions of research are also recommended.

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基金项目:
The German Research Foundation (Collaborative ResearCentre 622) support
作者简介:
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参考文献:

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