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High-pressure synthesis and application of a 13C diamond pressure sensor for experiments in a hydrothermal diamond anvil cell

Published online by Cambridge University Press:  05 July 2018

Nadezda Chertkova*
Affiliation:
Institute for Study of the Earth’s Interior, Okayama University, 827 Yamada, Misasa, Tottori, 682-0193, Japan
Shigeru Yamashita
Affiliation:
Institute for Study of the Earth’s Interior, Okayama University, 827 Yamada, Misasa, Tottori, 682-0193, Japan
Eiji Ito
Affiliation:
Institute for Study of the Earth’s Interior, Okayama University, 827 Yamada, Misasa, Tottori, 682-0193, Japan
Akira Shimojuku
Affiliation:
Institute for Study of the Earth’s Interior, Okayama University, 827 Yamada, Misasa, Tottori, 682-0193, Japan Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-0032, Japan

Abstract

Polycrystalline, cubic 13C diamond was synthesized from amorphous carbon in the Kawai-type multianvil apparatus at 21 GPa and at a temperature greater than 2350ºC. The polycrystalline diamond was homogeneous with a small grain size (10–20 μm) and a sharp Raman peak, and thereby was suitable as a pressure sensor for the experiments in a hydrothermal diamond anvil cell. Pressure- and temperature-dependence of the Raman shift of the synthesized 13C diamond was investigated in situ at simultaneous high pressures and high temperatures in the hydrothermal diamond anvil cell, using the ruby fluorescence line, quartz Raman shift and H2O phase transitions as pressure references. It was observed that the frequency shift with pressure is independent of temperature and vice versa up to 500ºC and 4.2 GPa. The present study indicates that the 13C diamond Raman shift can be used for pressure determination with an accuracy better than ±0.3 GPa under the conditions examined.

Information

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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