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Inclusions in large diamond single crystals at different temperatures of synthesis.

Inclusions in large diamond single crystals at different temperatures of synthesis.

Authors :
Fei Han
Shang-Sheng Li
Xue-Fei Jia
Wei-Qin Chen
Tai-Chao Su
Mei-Hua Hu
Kun-Peng Yu
Jian-Kang Wang
Yu-Min Wu
Hong-An Ma
Xiao-Peng Jia
Source :
Chinese Physics B; Feb2019, Vol. 28 Issue 2, p1-1, 1p
Publication Year :
2019

Abstract

The inclusions in large diamond single crystals have effects on its ultimate performance, which restricts its industrial applications to a great extent. Therefore, it is necessary to study the inclusions systematically. In this paper, large diamond single crystals with different content values of inclusions are synthesized along the (100) surface by the temperature gradient method (TGM) under 5.6 GPa at different temperatures. With the synthetic temperature changing from 1200 °C to 1270 °C, the shapes of diamonds change from plate to low tower, to high tower, even to steeple. From the microscopic photographs of the diamond samples, it can be observed that with the shapes of the samples changing at different temperatures, the content values of inclusions in diamonds become zero, a little, much and most, correspondingly. Consequently, with the temperature growing from low to high, the content values of inclusions in crystals increase. The origin of inclusions is explained by the difference in growth rate between diamond crystal and its surface. The content values of inclusions in diamond samples are quantitatively calculated by testing the densities of diamond samples. And the composition and inclusion content are analyzed by energy dispersive spectroscopy (EDS) and x-ray diffraction (XRD). From contrasting scanning electron microscopy (SEM) photographs, it can be found that the more the inclusions in diamond, the more imperfect the diamond surface is. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
16741056
Volume :
28
Issue :
2
Database :
Complementary Index
Journal :
Chinese Physics B
Publication Type :
Academic Journal
Accession number :
134768376
Full Text :
https://doi.org/10.1088/1674-1056/28/2/028103