Ultrasonic measurements of single-crystal gold under hydrostatic pressures up to 8 GPa in a Kawai-type multi-anvil apparatus  

作　　者：SONG MaoShuang Akira YONEDA Eiji ITO 

机构地区：[1]Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China [2]Institute for Study of the Earth Interior, Okayama University, Misasa, Tottori-ken 683-0193, Japan

出　　处：《Chinese Science Bulletin》2007年第12期1600-1606,共7页

基　　金：Supported by the Hundred Talents Program of Chinese Academy of Sciences;the COE program and the Postdoctoral Fellowship for Foreign Researchers from Japan Society for the Promotion of Science (JSPS)

摘　　要：Ultrasonic measurements were conducted on single-crystal gold at ambient condition and hydrostatic pressures up to 8 GPa at room temperature in a Kawai-type multi-anvil apparatus. The P-wave velocities measured at high pressures were in good agreement with Daniels and Smith’s ultrasonic study. The three independent elastic constants of gold at ambient condition were determined to be C11=192.7 GPa, C12=162.9 GPa, and C44=42.4 GPa. On the basis of an analysis of previous elastic data and the present ultrasonic data, the pressure derivatives of three elastic constants were estimated to be C1 ′1= 7.12,C 1′2 = 6.24,and C4′4 = 1.82. The calculated values of isothermal bulk modulus (KT0) and its pressure derivatives ( KT ′0) are KT0 = 166.44 GPa and KT ′0= 6.56. This indicates that Anderson et al.’s model of equation of state of gold might underestimates pressure about 1 GPa at pressure around 23 GPa and ambient temperature. Our results explained the discrepancies among the models of equation of state of gold proposed previously.Ultrasonic measurements were conducted on single-crystal gold at ambient condition and hydrostatic pressures up to 8 GPa at room temperature in a Kawai-type multi-anvil apparatus. The P-wave velocities measured at high pressures were in good agreement with Daniels and Smith＇s ultrasonic study. The three independent elastic constants of gold at ambient condition were determined to be C11=192.7 GPa, C12=162.9 GPa, and C44=42.4 GPa. On the basis of an analysis of previous elastic data and the present ultrasonic data, the pressure derivatives of three elastic constants were estimated to be C11 = 7.12, C12 = 6.24, and C44 = 1.82. The calculated values of isothermal bulk modulus （KTO） and its pressure derivatives （K′TO） are KTO = 166.44 GPa and K′TO = 6.56. This indicates that Anderson et al.＇s model of equation of state of gold might underestimates pressure about 1 GPa at pressure around 23 GPa and ambient temperature. Our results explained the discrepancies among the models of equation of state of gold proposed previously.

关 键 词：单晶体黄金 超声波测量 高温高压实验 流体静力学 状态方程 

分 类 号：O614.123[理学—无机化学]