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作 者:宋中华[1] 陆太进[2] 唐诗[2] 高博[2] 苏隽[2] 柯捷[2] SONG Zhong-hua;LU Tai-jin;TANG Shi;GAO Bo;SU Jun;KE Jie(National Gemstone Testing Center,Shenyang 110013,China;National Gemstone Testing Center,Beijing 100013,China)
机构地区:[1]国家珠宝玉石质量监督检验中心沈阳实验室,辽宁沈阳110013 [2]国家珠宝玉石质量监督检验中心,北京100013
出 处:《岩矿测试》2020年第1期85-91,共7页Rock and Mineral Analysis
基 金:国家自然科学基金项目(41473030,41272086);国家珠宝玉石质量监督检验中心科研基金项目(NGTCQT180011)
摘 要:Ⅱa型钻石的高温高压改色及褪色研究已开展了大量工作,然而对Ⅰa型Cape系列褐色钻石在高温高压处理条件下的行为尚不明确。为解析实验室钻石鉴定工作中遇到的黄色钻石颜色成因问题,本文选取了Ⅰa型Cape系列褐色钻石作为研究对象,进行高温高压改色处理实验,并对处理前后的样品的紫外可见吸收光谱、红外吸收光谱以及光致发光光谱等谱学特征进行对比分析。结果表明:经高温高压改色处理后,钻石颜色由灰褐色变为褐黄色,钻石的紫外可见吸收光谱、红外吸收光谱和光致发光光谱也发生了很大改变。经处理的褐色钻石,其紫外可见吸收光谱中除原有的415nm和477nm吸收外,还产生503.2nm吸收,同时550nm至短波的吸收增强,钻石因此由原来的灰褐色变为褐黄色;红外吸收光谱中,1498、1520、1547cm^-1三个峰变为一个以1498cm^-1为中心的吸收宽峰;光致发光光谱中,产生了明显的H3(503.2nm)以及H2(986.2nm)缺陷。本研究获得的光谱变化特征为准确鉴定高温高压改色处理的Cape型钻石提供了依据,也为更好地理解晶格中氮、氢等相关的格子缺陷在高温高压条件下的变化机理提供了实验数据和分析。BACKGROUND: Spectroscopic characteristics for brown colored Type Ⅱa diamonds treated by high pressure high temperature(HPHT) processes have been investigated extensively. However, almost no reports are available on the variation of the spectroscopic features for the type Ⅰa Cape series brown colored diamonds treated by HPHT processes.OBJECTIVES: To help the laboratory to resolve the origin of yellow diamonds.METHODS: The ultraviolet-visible(UV-Vis) absorption spectroscopy, Fourier transform infrared spectroscopy(FTIR), and photoluminescence spectroscopy were used to analyze the spectral features for the samples before and after each treatment.RESULTS: The color of the diamonds changed from grayish brown to brownish yellow after the HPHT process. Meanwhile, the FTIR/UV-Vis absorption, as well as the photoluminescence was also greatly changed. Besides the 415 nm and the 477 nm absorption peaks, the treated diamonds also display H3 defect(503.2 nm) and the gradually increasing absorption from 550 nm to shortwave, resulted in the color changing from grayish brown to brownish yellow. In the mid-infrared region, the three peaks of 1498, 1520 and 1547 cm^-1 become a broad band centered at 1498 cm^-1 after treatment, and the photoluminescence spectrum displayed two distinct defects-H3(503.2 nm) and H2(986.2 nm). CONCLUSIONS: The spectroscopic features provide a basis for accurate identification of HPHT-treated type Ⅰa Cape series brown diamonds in gem laboratories, and increase understanding of the variation mechanism of the nitrogen and hydrogen related lattice defects in the diamonds during the HPHT processes.
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