High pressure-high temperature synthesis and elasticity of the cubic nitride spinel γ-Si3N4

被引:99
作者
Soignard, E
Somayazulu, M
Dong, JJ
Sankey, OF
McMillan, PF
机构
[1] Arizona State Univ, Dept Chem & Biochem, Tempe, AZ 85287 USA
[2] Arizona State Univ, Ctr Solid State Sci, Tempe, AZ 85287 USA
[3] Arizona State Univ, Dept Phys & Astron, Tempe, AZ 85287 USA
[4] Auburn Univ, Dept Phys, Auburn, AL 36849 USA
关键词
D O I
10.1088/0953-8984/13/4/302
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
The compressional behaviour of a new dense form of silicon nitride with the cubic spinel structure is studied by energy dispersive x-ray diffraction, following in situ synthesis from the low pressure form by laser heating in the diamond anvil cell, combined with theoretical density functional calculations (LDA and GGA). The unit cell dimension and the ambient temperature bulk modulus and its pressure derivative are determined to be V(0) = 8.29(+/-0.03) Angstrom (3)/atom, K(0) = 308(+/-5) GPa and K'(0) = 4+/-(0.2), in excellent agreement with theoretical calculations within the LDA and GGA. The calculated sh;ear modulus is two to three times those of corresponding oxide spinels, and there is a substantial Cauchy violation, indicating a material with strong covalent bonding that is likely to be extremely hard.
引用
收藏
页码:557 / 563
页数:7
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