A. M. Minyukhina, A. K. Busova, R. I. Korolev, B. A. Makeev, R. N. Skandakov, S. V. Nekipelov, N. A. Zhuk
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引用次数: 0
摘要
采用陶瓷法从铋(III)和铬(III)氧化物合成了含铋铬酸盐 BixCrO1.5x+3,摩尔比为 1 ≤ n (Bi)/n (Cr) ≤ 38。根据 n (Bi)/n (Cr) 的比例,煅烧样品呈现出从绿色到暗红色的颜色变化。当氧化物中氧化铋的比例 n (Bi2O3)/n (Cr2O3) ≥ 3 的氧化物混合物在空气中进行高温处理(650°C)时,陶瓷材料的颜色会从绿色变为红色。值得注意的是,铬(III)氧化物在类似条件下煅烧时不会发生铬离子氧化。X 射线衍射分析证实了铬酸盐的形成,包括 Bi6Cr2O15、Bi10Cr2O21、Bi31Cr5O61.5 和 Bi14CrO24。样品的 X 射线光谱研究显示,红色铋铬陶瓷的 NEXAFS Cr2p 光谱与 K2CrO4 光谱的主要细节相似,表明铬以四面体离子的形式存在于氧化物陶瓷中。此外,扫描电子显微镜数据表明,样品呈现出致密、低孔隙率的微观结构。
Oxidation of Cr (III) to Cr (VI) in the Synthesis of Bismuth-Chromium Oxide Ceramics
Bismuth-containing chromates, BixCrO1.5x+3 , were synthesized using a ceramic method from bismuth (III) and chromium (III) oxides, with a variable molar ratio of 1 ≤ n (Bi)/n (Cr) ≤ 38. The calcined samples exhibit a color variation from green to dark red, depending on the n (Bi)/n (Cr) ratio. The ceramic materials undergo a color change from green to red when a mixture of oxides with a significant predominance of bismuth oxide n (Bi2O3)/n (Cr2O3) ≥ 3 is subjected to a high-temperature treatment in air (at 650°C). It is noteworthy that the calcination of chromium (III) oxide under similar conditions occurs without the oxidation of chromium ions. X-ray diffraction analysis confirmed the formation of chromates, including Bi6Cr2O15, Bi10Cr2O21, Bi31Cr5O61.5, and Bi14CrO24 . X-ray spectroscopy studies of the samples revealed that the NEXAFS Cr2p spectra of the red bismuth-chromium ceramics exhibited similarities in the main details of the K2CrO4 spectrum, indicating the presence of chromium in the oxide ceramics in the form of tetrahedral \({\text{CrO}}_{4}^{2-}\) ions. In addition, scanning electron microscopy data demonstrated that the samples exhibited a dense, low-porosity microstructure.
期刊介绍:
Glass and Ceramics reports on advances in basic and applied research and plant production techniques in glass and ceramics. The journal''s broad coverage includes developments in the areas of silicate chemistry, mineralogy and metallurgy, crystal chemistry, solid state reactions, raw materials, phase equilibria, reaction kinetics, physicochemical analysis, physics of dielectrics, and refractories, among others.