Corresponding relationship between characteristic birefringence, strain, and impurities in Zimbabwean mixed-habit diamonds revealed by mapping techniques
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Published:2022-11-09
Issue:6
Volume:34
Page:539-547
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ISSN:1617-4011
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Container-title:European Journal of Mineralogy
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language:en
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Short-container-title:Eur. J. Mineral.
Author:
Sun ChengyangORCID, Lu Taijin, He Mingyue, Song Zhonghua, Deng Yi
Abstract
Abstract. Birefringence in diamond is an optical phenomenon related
to strain and various defects in crystal lattices. Despite extensive
investigations being done to characterize and quantify it, there is still
controversy about its origin in diamond lattices. Here we report the
relationship between the distribution of birefringence patterns observed
under cross-polarized light, strain features analyzed by Raman mapping, and
the impurity characteristics revealed by Fourier transform infrared spectroscopy (FTIR) mapping in natural mixed-habit
diamonds. It was deduced that the plastic deformation was enhanced with
higher tensile residual stress, and nitrogen and VN3H defects
were more enriched as a result of the temperature increase during
crystallization, at growth bands showing straight birefringence patterns and
the relative enrichment of graphite inclusions. These results provided solid
data and insights for birefringence-related properties in diamond and
correlated the occurrence of birefringence with diamond spectroscopic
properties, which promoted the understanding of the formation of
birefringence in natural diamonds and would be helpful for the synthesis of
high-quality, birefringence-free diamonds.
Funder
National Natural Science Foundation of China
Publisher
Copernicus GmbH
Subject
Pulmonary and Respiratory Medicine,Pediatrics, Perinatology and Child Health
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