Peculiarities of phase formation in the Cs2O—Al2O3—SiO2 system prepared from precursors obtained by hydrothermal synthesis

IF 1.7 4区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Russian Chemical Bulletin Pub Date : 2025-03-25 DOI:10.1007/s11172-025-4499-4

A. V. Fedorova, O. N. Pestova, A. A. Selyutin, V. L. Stolyarova

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Abstract

Peculiarities of phase formation in the ternary oxide system Cs₂O—Al₂O₃—SiO₂ have been studied using samples prepared from precursors obtained by hydrothermal synthesis followed by calcination of the reaction mixtures at different temperatures for different times. The samples were identified by high-resolution X-ray powder diffraction (HRXPD), simultaneous thermal analysis, and X-ray fluorescence spectroscopy. A HRXPD study revealed that all the samples contained an X-ray amorphous phase and crystalline phases. According to HRXPD data, the crystalline phases in the samples with the compositions Cs₂O : Al₂O₃ : SiO₂ = 33.0 : 33.0 : 33.0 and 30.0 : 50.0 : 20.0 (mol.%) corresponded to cesium aluminosilicate CsAlSiO₄, while those in the sample containing equimolar amounts of the oxides corresponded to CsAlO₂, CsAlSiO₄, and Cs₂CO₃·3H₂O formed on the surface of the sample. An X-ray fluorescence spectroscopy study demonstrated that the elemental composition of the heat-treated samples remains close to the intended stoichiometric composition.

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利用水热合成法获得的前驱体制备的 Cs2O-Al2O3-SiO2 系统中相形成的特殊性

采用水热合成前驱体，在不同温度下煅烧不同时间制备样品，研究了三元氧化体系cs20 - al2o3 - sio2的相形成特性。采用高分辨率x射线粉末衍射（HRXPD）、同步热分析和x射线荧光光谱对样品进行了鉴定。HRXPD研究表明，所有样品均含有x射线非晶相和结晶相。根据HRXPD数据，在组成为Cs2O: Al2O3: SiO2 = 33.0: 33.0: 33.0和30.0:50.0:20.0 （mol.%）的样品中形成的晶相对应于铯铝硅酸盐CsAlSiO4，而在含有等摩尔量氧化物的样品中形成的晶相对应于CsAlO2、CsAlSiO4和Cs2CO3·3H2O。x射线荧光光谱研究表明，热处理样品的元素组成仍然接近预期的化学计量组成。

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来源期刊

Russian Chemical Bulletin 化学-化学综合

CiteScore

2.70

自引率

47.10%

发文量

257

审稿时长

3-8 weeks

期刊介绍： Publishing nearly 500 original articles a year, by leading Scientists from Russia and throughout the world, Russian Chemical Bulletin is a prominent international journal. The coverage of the journal spans practically all areas of fundamental chemical research and is presented in five sections: General and Inorganic Chemistry; Physical Chemistry; Organic Chemistry; Organometallic Chemistry; Chemistry of Natural Compounds and Bioorganic Chemistry.