Elasticity of cubic boron nitride under ambient condition
Abstract
The divergence of different pressure scales people currently use in high temperature high pressure research when exceeding 200 GPa has been an important issue recent years. New pressure scales with acceptable accuracy are acutely in need. Cubic boron nitride (cBN) is a very promising potential candidate for pressure calibration by using its thermodynamic properties and PVT equation of state. However, its elastic properties at ambient conditions are known only within very broad bounds from the few existed experiments. The ambiguity of the theoretical calculation is even larger. Here we have measured the single-crystal elastic properties of cBN accurately by single crystal Brillouin spectroscopy, the final values we obtained in our experiment are C11=798.4±1.1GPa, C22=469.0±0.6GPa, C33 = 172.4±1.0GPa, with isotropic aggregate bulk modulus Ks=381.1±1.0GPa and shear modulus G=398.78±0.6GPa (Hill average). Our results resolve discrepancies in the previously reported values and greatly improve the precision and accuracy with which the elastic properties of cBN are known. We gratefully acknowledge support of this work by National Science Foundation.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2010
- Bibcode:
- 2010AGUFMMR33A1994Z
- Keywords:
-
- 3909 MINERAL PHYSICS / Elasticity and anelasticity;
- 3919 MINERAL PHYSICS / Equations of state;
- 3934 MINERAL PHYSICS / Optical;
- infrared;
- and Raman spectroscopy;
- 3994 MINERAL PHYSICS / Instruments and techniques