HIGH-PRESSURE ELASTIC PROPERTIES OF LIQUID AND SOLID AMMONIA
HIGH-PRESSURE ELASTIC PROPERTIES OF LIQUID AND SOLID AMMONIA
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液态和固态氨的高压弹性特性
DOI：
10.1103/physrevb.57.13347
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发表时间：
1998
影响因子：
3.7
通讯作者：
H. Shimizu
中科院分区：
文献类型：
--
作者：
T. Kume;M. Daimon;S. Sasaki;H. Shimizu
利用布里渊散射技术在金刚石压砧装置中对NH3单晶进行了声速、绝热弹性常数、绝热体积模量和折射率的测量。面心立方结晶NH3（第三相）的三个弹性常数和体积模量分别为：C11 = 23.2，C12 = 18.8，C44 = 8.9GPa; B S= 20.2GPa（压力为3.0GPa）。从弹性常数得到的弹性各向异性显示出一个大的值（4.06在3.0 GPa），表明分子运动的旋转-平移耦合是有效的取向无序相III。与其他分子固体的弹性各向异性的压力依赖性的比较表明，氢键对压缩下的分子旋转的影响。
Acoustic velocity, adiabatic elastic constants, adiabatic bulk modulus, and the refractive index of liquid and solid NH 3 were determined under pressures up to 3.5 GPa at room temperature, by Brillouin spectroscopy with in situ identification for the orientation of single crystal NH 3 in a diamond-anvil cell. Values of three elastic constants and bulk modulus for fcc crystalline NH 3 (phase III) are, eg, C 11= 23.2, C 12= 18.8, and C 44= 8.9 GPa, and B S= 20.2 GPa at a pressure of 3.0 GPa, respectively. The elastic anisotropy obtained from the elastic constants shows a large value (4.06 at 3.0 GPa), indicating that rotation-translation coupling of the molecular motions is effective in the orientationally disordered phase III. Comparisons of the pressure dependence of NH 3 elastic anisotropy with those for other molecular solids suggest that the hydrogen bond influences on the molecular rotation under compression.