Uniaxial Stress Component in WC Toroidal Anvils under High Pressure and Temperature

✍ Scribed by Grima Gallardo, P. ;Besson, J.M. ;Iti�, J.P. ;Gauthier, M. ;M�zouar, M. ;Klotz, S. ;H�usermann, D. ;Hanfland, M.

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 169 KB
• Volume: 180
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/1521-396x(200008)180:2<427::aid-pssa427>3.0.co;2-l

✦ Synopsis

The uniaxial stress components (USC), t, have been measured in NaCl samples, under variable pressure and temperature, in tungsten carbide (WC) toroidal anvils by energy dispersive X-ray diffraction under synchrotron radiation in a large volume Paris-Edinburgh cell. It was observed that t increases with load and at p 4.6 GPa, t À0.6 GPa (measured from the mean value of the lattice parameter of NaCl). When heating is applied (under load), t decreases, and becomes zero for T > 600 K. On cooling at constant load, t remains negligible (t 0.01 GPa) down to room temperature. After loading again (p 3.8 GPa) at room temperature, t remains small (t À0.07 GPa). A measurement of the FWHM of the diffraction peaks verifies the improvement in hydrostaticity after heating.