• journal_title：Mineralogical Magazine
• Contributor：Dawei W. Fan ; Wenge G. Zhou ; Congqiang Q. Liu ; Yonggang G. Liu ; Fang Wan ; Yinsuo S. Xing ; Jing Liu ; Ligang G. Bai ; Hongsen S. Xie
• Publisher：Mineralogical Society of Great Britain and Ireland
• Date：2009-
• Format：text/html
• Language：en
• Identifier：10.1180/minmag.2009.073.1.95
• journal_abbrev：Mineralogical Magazine
• issn：0026-461X
• volume：73
• issue：1
• firstpage：95
• section：Articles

In situ X-ray diffraction measurements on almandine, (Fe_0.86Mg_0.07Mn_0.07)₃Al₂Si₃O₁₂, were performed using a heating diamond-anvil cell instrument with synchrotron radiation at Beijing Synchrotron Radiation Facility up to 27.7 GPa and 533 K. The pressure-volume-temperature data were fitted to a third-order Birch-Murnaghan equation of state. The isothermal bulk modulus of K₀ = 177±2 GPa, a temperature derivative of the bulk modulus of (∂K/∂T)_P= -0.032±0.016 GPaK^-1 and a thermal expansion coefficient (α₀) of (3.1±0.7) × 10^-5 K^-1 were obtained. This is the first time that the temperature derivative of the bulk modulus of almandine has been determined at high pressure and high temperature. Combining these results with previous results, the compositional dependence of the bulk modulus, thermal expansion, and temperature derivative of the bulk modulus are discussed.