Analysis of a P–V–T relationship for MgO

✍ Scribed by Vivek Singh; A.K. Gautam; K.S. Singh

• Book ID: 103883383
• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 237 KB
• Volume: 352
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2004.07.006

✦ Synopsis

In the present paper we have studied the pressure-volume-temperature (P-V-T) relationship for MgO under high pressures and at high temperatures. We have used the basic thermodynamic formulation and a numerical method for evaluating the thermal pressure for MgO starting from room temperature (T=300 K) up to its melting temperature (TC3000 K). The volume-temperature relationships under isobaric conditions have been obtained and compared with the available experimental data based on density measurements. We make use of some important phenomenological forms of the equation of state such as (1) the Birch-Murnaghan EOS, (2) the Rydberg-Vinet EOS and (3) the Shanker EOS. Finally, we have determined the P-V-T relationship for MgO in the temperature range 300-3000 K for pressures up to 224 GPa. The results obtained in the present study are in good agreement with the available experimental data for predicting the pressure-volume relationship along different isotherms at selected temperatures.