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首页> 外文期刊>Journal of structural chemistry >Phase formation in mixed TiO_2-ZrO_2 oxides prepared by sol-gel method
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Phase formation in mixed TiO_2-ZrO_2 oxides prepared by sol-gel method

机译:溶胶-凝胶法制备TiO_2-ZrO_2混合氧化物的相形成

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摘要

Pure titania, zirconia, and mixed oxides (3-37 mol.% of ZrO_2) are prepared using the sol-gel method and calcined at different temperatures. The calcined samples are characterized by Raman spectroscopy, X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption porosimetry. Measurements reveal a thermal stability of the titania anatase phase that slightly increases in the presence of 3-13 mol.% of zirconia. Practically, the titania anatase-rutile phase transformation is hindered during the temperature increase above 700°C. The mixed oxide with 37 mol.% of ZrO_2 treated at 550°C shows a new single amorphous phase with a surface area of the nanoparticles double with respect to the other crystalline samples and the formed srilankite structure (at 700°C). The anatase phase is not observed in the sample containing 37 mol.% of ZrO_2. The treatment at 700°C causes the formation of the srilankite (Ti _(.63)Zr_(0.37)O_x) phase.
机译:使用溶胶-凝胶法制备纯的二氧化钛,氧化锆和混合氧化物(3-37摩尔%的ZrO_2),并在不同温度下煅烧。煅烧样品通过拉曼光谱,X射线粉末衍射,扫描电子显微镜,透射电子显微镜和氮吸附孔隙率法进行表征。测量表明,在3-13mol。%的氧化锆存在下,二氧化钛锐钛矿相的热稳定性略有增加。实际上,在高于700℃的温度升高期间,二氧化钛锐钛矿-金红石相转变受到阻碍。在550℃下处理的具有37mol%的ZrO 2的混合氧化物显示出新的单一非晶相,该纳米颗粒的表面积相对于其他晶体样品为两倍,并且形成了绢晶结构(在700℃)。在含有37mol。%的ZrO_2的样品中未观察到锐钛矿相。在700°C下进行处理会导致生成绢云母(Ti _(。63)Zr_(0.37)O_x)相。

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