高温高温处理黄色Ib型CVD合成金刚石的鉴定特性

Zhu Wenfang, D. Ting, Lin Huihuang, Zhu Xiaoxia
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引用次数: 0

摘要

合成型Ⅰb型黄钻主要采用高压高温(HPHT)法生长,但目前为止,关于Ⅰb型CVD合成黄钻的报道很少。NGTC深圳实验室在日常检测中首次识别出黄色型Ⅰb CVD合成金刚石样品。总结该黄色型Ⅰb CVD合成金刚石的鉴定特征对珠宝检测行业至关重要,这将有助于今后有效地识别问题样品。通过采集样品的红外吸收光谱、紫外-可见吸收光谱、紫外荧光图像和光致发光光谱,总结了鉴定黄色型Ⅰb CVD合成金刚石的方法。[Si-V]缺陷在737nm、766nm和946nm处的发光峰以及荧光下观察到的平行生长条纹是CVD合成金刚石的诊断证据。在596 nm和597 nm处没有发现双峰,有较弱的3 123 cm-1峰,有明显的3 107 cm-1峰、H3 (503.2 nm)发射和N3 (415.2 nm)发射,表明其经过生长后高温退火去除了生长时的褐色。
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Identification Characteristic of HPHT-Treated Yellow Type Ib CVD Synthetic Diamond
Synthetic type Ⅰb yellow diamonds are mainly grown by High Pressure High Temperature(HPHT) process, however, type Ⅰb CVD synthetic yellow diamonds have rarely been reported so far. A yellow type Ⅰb CVD syntheitc diamond sample was recognized for the first time in NGTC Shenzhen Laboratory during daily testing. It is critical for jewelry testing industries to summarize the identification characteristics of this yellow type Ⅰb CVD synthetic diamond, which will be helpful to identify problematic samples efficiently in the future. The means to identify the yellow type Ⅰb CVD synthetic diamond are summarized by collecting the infrared absorption spectrum, ultraviolet-visible absorption spectrum, ultraviolet fluorescence image and photoluminescence spectrum of the sample. The luminescence peaks at 737, 766 nm and 946 nm attributed to [Si-V] defects, and the parallel growth striations observied under fluorescence were diagnostic proofs of CVD synthetic diamonds. No doublet peaks at 596 nm and 597 nm were found and weaker 3 123 cm-1peak was detected, and the obvious 3 107 cm-1 peak, H3 (503.2 nm) emission and N3 (415.2 nm) emission suggested that it has undergone post-growth high temperature annealing to remove the as-grown brown coloration.
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