应用FTIR-SEM研究一类合成欧珀的微结构及其变彩成因机制

发布时间：2018-05-23 07:02

本文选题：合成欧泊 + 体色　；参考：《岩矿测试》2017年01期

【摘要】：近些年来,相关人工合成欧泊的研究工作主要聚焦于天然与合成欧泊的鉴别与筛选,而相关合成欧泊的微结构、变彩机制及其中水的赋存状态的深入研究鲜见报道。本文通过傅里叶变换红外光谱(FTIR)、场发射扫描电镜(FE-SEM)对一类合成欧泊的微结构、结构缺陷进行较系统的研究。同时,结合对样品的热处理就该合成欧泊体色、变彩机制及其中水的赋存状态作了初步探讨。结果表明:该样品的红外光谱中,在约2900 cm~(-1)、1737 cm~(-1)处出现合成欧泊特征吸收,且在4000~6000 cm-1波段,合成欧泊相比天然欧泊的吸收峰更为复杂。合成欧泊的颜色由体色与变彩两者共同构成,该体色与存在于其微结构中准球状、粒径约205 nm的二氧化硅颗粒的间隙填充物直接关联,且在热处理条件下随着间隙物的析出而渐退。同时,该类合成欧泊的变彩归因于结构致色并由其内部SiO_2颗粒周期性排列而构成的三维的光子带隙结构所致。此外,在欧泊的微观结构发生重构前,变彩所呈现的颜色主要由准球状二氧化硅颗粒粒径与间隙填充物决定。
[Abstract]:In recent years, the research work on synthetic Opel has focused on the identification and screening of natural and synthetic Opel. However, there are few reports on the microstructures, color changing mechanism and the occurrence state of water in synthetic Opel. In this paper, Fourier transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy (FE-SEM) are used to study the microstructures and structural defects of a class of synthetic opal. At the same time, combined with the heat treatment of the sample, the synthesis of the opal color, the mechanism of color change and the occurrence of water in the sample were preliminarily discussed. The results show that the characteristic absorption of synthetic opal is observed at about 2900 cm ~ (-1) ~ (-1) in the infrared spectrum of the sample, and the absorption peak of synthetic Opel is more complex than that of natural Opel at the wavelength of 4 000 ~ 6 000 cm-1. The color of synthetic opal is composed of both body color and color variation. The color is directly related to the interstitial filler of silica particles, which exist in its microstructure and are about 205nm in diameter. And under the condition of heat treatment, it retreats with the precipitation of the interstitial matter. At the same time, the color variation of this kind of synthetic opal is attributed to the three-dimensional photonic band gap structure formed by the chromogenic structure and periodic arrangement of the inner SiO_2 particles. In addition, before the reconstruction of the microstructure of Opal, the color of color change is mainly determined by the particle size of quasi-spherical silica particles and interstitial fillers.
【作者单位】：浙江省质量检测科学研究院;浙江工业大学材料科学与工程学院;
【基金】：国家自然科学基金资助项目(21506187) 浙江省质量监督系统科研计划项目(20130207)
【分类号】：TQ164

【相似文献】