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Effect of HPHT Treatment on Spectroscopic Features of Natural Type Ib-IaA Diamonds Containing Y Centers
Crystals ( IF 2.7 ) Pub Date : 2020-05-07 , DOI: 10.3390/cryst10050378
Igor N. Kupriyanov , Yuri N. Palyanov , Alexander A. Kalinin , Vladislav S. Shatsky

In this paper, we report a spectroscopic study of natural type Ib-IaA diamonds containing Y centers subjected to high-pressure high-temperature treatment at 7–7.5 GPa and 1700–2200 °C. Diamond samples showing the Y centers as the dominant absorption feature in the infrared spectra were selected from a collection of natural diamonds from alluvial placers of the northeastern Siberian Platform. The samples were investigated by spectroscopic techniques before and after each annealing stage. It was found that upon annealing at temperatures higher than 2000°C, the defect-induced one-phonon spectra changed from the Y centers to a new form with a characteristic band peaking at 1060 cm−1. Photoluminescence spectra of the samples were modified after each annealing stage starting from 1700 °C. The most significant changes in photoluminescence occurred at temperatures higher than 2000 °C and were associated with a sharp increase of the intensity of an emission band peaking at about 690 nm. A comparison with natural red-luminescing diamonds from Yakutian kimberlite pipes was performed. It was concluded that the observed 1060 cm−1 IR band and the 690 nm red emission band are genetically related to the Y centers and that defects or impurities responsible for the Y centers appear quite widespread in natural diamonds from various deposits worldwide.

中文翻译:

HPHT处理对含Y中心的天然Ib-IaA钻石光谱特性的影响

在本文中,我们报告了含有Y中心的天然Ib-IaA钻石的光谱研究,这些钻石在7–7.5 GPa和1700–2200°C的温度下进行了高压高温处理。从东北西伯利亚平台的冲积砂岩中收集了一系列天然钻石,选择了在红外光谱中显示Y中心为主要吸收特征的钻石样品。在每个退火阶段之前和之后,通过光谱技术研究样品。发现在高于2000℃的温度下退火时,由缺陷引起的单声子谱从Y中心改变为具有在1060cm -1处峰值的特征带的新形式。。从1700°C开始的每个退火阶段后,对样品的光致发光光谱进行了修改。光致发光的最显着变化发生在高于2000°C的温度下,并且与在约690 nm处达到峰值的发射带强度急剧增加有关。与雅库特金伯利岩管的天然红色发光钻石进行了比较。结论是,观察到的1060 cm -1 IR带和690 nm红色发射带在遗传上与Y中心相关,并且构成Y中心的缺陷或杂质在全球各地天然钻石中非常普遍。
更新日期:2020-05-07
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