Pressure-volume-temperature behavior of fayalite based on static compression measurements at 400° C

✍ Scribed by Thomas G. Plymate; James H. Stout

• Book ID: 104661100
• Publisher: Springer-Verlag
• Year: 1990
• Tongue: English
• Weight: 827 KB
• Volume: 17
• Category: Article
• ISSN: 0342-1791
• DOI: 10.1007/bf00201452

✦ Synopsis

Twenty-one energy-dispersive X-ray diffraction spectra for fayalite at 400~ constitute the basis for an elevated-temperature static compression isotherm for this important silicate mineral. A Murnaghan regression of the resulting molar volumes yields 103.8 GPa and 7.1 for the 400 ~ C, room-pressure values of the isothermal bulk modulus (Ko) and its first pressure derivative (K;), respectively. When compared to the room-temperature static compression isotherm of , our 400 ~ C value for Ko yields -5.4 x 10 -2 GPa/deg for (aK/OT)o o. When combined with literature volume data, our measurements indicate that the fayalite isochores are strongly concave toward the pressure axis [ (~z T/~P 2)v < 03.