Hardness of cubic silicon nitride
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F. Oba Engineering Research Institute, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
T. Sekine Advanced Materials Laboratory, National Institute for Materials Science, Namiki, Tsukuba 305-0044, Japan
E. Ito and A. Kubo Institute for Study of the Earth’s Interior, Okayama University, Misasa, Tottori 682-0193, Japan
K. Tatsumi and H. Adachi Department of Materials Science and Engineering, Kyoto University, Sakyo, Kyoto 606-8501, Japan
T. Yamamoto Department of Advanced Materials Science, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan (Received 21 August 2001; accepted 4 February 2002)
We report that polycrystalline cubic-Si3N4 with a spinel structure and low oxygen concentration (
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