Thermal equation of state of a natural kyanite up to 8.55 GPa and 1273 K  

作　　者：Qiang He Xi Liu Baosheng Li Liwei Deng Wei Liu Liping Wang 

机构地区：[1]Key Laboratory of Orogenic Belts and Crustal Evolution,Ministry of Education of China,Beijing 100871,China [2]School of Earth and Space Sciences,Peking University,Beijing 100871,China [3]Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621900,China [4]Mineral Physics Institute,Stony Brook University,Stony Brook,NY 11794-2100,USA [5]Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China [6]High Pressure Science and Engineering Center and Department of Physics and Astronomy,University of Nevada,Las Vegas,NV 89154,USA

出　　处：《Matter and Radiation at Extremes》2016年第5期269-276,共8页极端条件下的物质与辐射（英文）

基　　金：This work is financially supported by the Natural Science Foundation of China(Grant No.41273072);by the Strategic Priority Research Program(B)of the Chinese Academy of Sciences(XDB18030602).

摘　　要：The thermal equation of state of a natural kyanite has been investigated with a DIA-type,cubic-anvil apparatus(SAM85)combined with an energy-dispersive synchrotron X-ray radiation technique up to 8.55 GPa and 1273 K.No phase transition was observed in the studied pressure-temperature(P-T)range.The Le Bail full profile refinement technique was used to derive the unit-cell parameters.By fixing the bulk modulus K 0 as 196 GPa and its pressure derivative K0 as 4,our P-V(volume)-T data were fitted to the high temperature BircheMurnaghan equation of state.The obtained parameters for the kyanite are:V_(0)=294.05(9)Å^(3),a=2.53(11)×10^(-5)K^(-1) and(K/T)P=-0.021(8)GPa∙K^(-1).These parameters have been combined with other experimentally-measured thermodynamic data for the relevant phases to calculate the P-T locus of the reaction kyanite¼stishoviteþcorundum.With this thermodynamically constrained phase boundary,previous high-pressure phase equi-librium experimental studies with the multi-anvil press have been evaluated.

关 键 词：KYANITE X-ray diffraction Thermal equation of state High-pressure and high-temperature Kyanite decomposition Thermodynamic calculation 

分 类 号：TG1[金属学及工艺—金属学]