TY - JOUR
T1 - Hardness of cubic silicon nitride
AU - Tanaka, I.
AU - Oba, F.
AU - Sekine, T.
AU - Ito, E.
AU - Kubo, A.
AU - Tatsumi, K.
AU - Adachi, H.
AU - Yamamoto, T.
N1 - Funding Information:
The joint work between Kyoto University and The University of Tokyo was supported by the Grant-In-Aid for priority area (No. 751) from Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan, F.O. acknowledges Japan Society for the Promotion of Science (JSPS) for providing a research fellowship for young scientists. T.S. is grateful for a support from the Advanced Materials Laboratory/National Institute for Materials Science (AML/NIMS) COE project. We are also grateful to A. Zerr, R. Riedel, and coworkers for showing us Ref. 16 before publication.
PY - 2002/4
Y1 - 2002/4
N2 - We report that polycrystalline cubic-Si3N4 with a spinel structure and low oxygen concentration (<0.5 wt%) shows Vickers hardness of 43 GPa when measured with the indentation load of 10 mN. The hardness decreases with the increase of the indentation load, which can be ascribed to the presence of weak grain boundaries. The high hardness can be well explained by its large shear modulus as predicted by first-principles calculations.
AB - We report that polycrystalline cubic-Si3N4 with a spinel structure and low oxygen concentration (<0.5 wt%) shows Vickers hardness of 43 GPa when measured with the indentation load of 10 mN. The hardness decreases with the increase of the indentation load, which can be ascribed to the presence of weak grain boundaries. The high hardness can be well explained by its large shear modulus as predicted by first-principles calculations.
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U2 - 10.1557/JMR.2002.0105
DO - 10.1557/JMR.2002.0105
M3 - Article
AN - SCOPUS:0036541892
SN - 0884-2914
VL - 17
SP - 731
EP - 733
JO - Journal of Materials Research
JF - Journal of Materials Research
IS - 4
ER -