High temperature elasticity of sodium chloride
High temperature elasticity of sodium chloride
复制标题
氯化钠高温弹性
DOI：
10.1016/0022-3697(87)90078-3
复制
发表时间：
1987
影响因子：
4
通讯作者：
O. Anderson
中科院分区：
文献类型：
--
作者：
S. Yamamoto;I. Ohno;O. Anderson
用矩形波共振（RPR）方法研究了氯化钠单晶在770K（德拜温度的2.5倍）以下的高温弹性。弹性刚度常数C11和C44随温度线性下降，而C12几乎与温度无关，并在500 K附近显示出最大值。RPR方法特别适合于高温下的弹性测量，因为没有使用胶水将传感器连接到样品，因此，测得的频谱非常接近于在空间中没有外部接触的自由悬挂试样的理论频谱。研究了远高于德拜温度的氯化钠的热力学性质，与以前的零压热膨胀系数和热容数据一起使用。本文详细讨论了非谐性对氯化钠状态方程的影响，结果之一是验证了德克尔的氯化钠状态方程中的参数。另一个结果是，对于德拜温度以上的温度，NaCl的热压力随温度线性增加，并且与体积无关。
High temperature elasticity of single crystal sodium chloride has been studied by the Rectangular Parallelepiped Resonance (RPR) method up to 770 K (≅ 2.5 times the Debye temperature). The elastic stiffness constants, C11and C44, decrease linearly with temperature while C12is almost independent of temperature and shows a maximum around 500 K.The RPR method is particularly suited to measurements of elasticity at high temperature, since no glues are used to connect the transducers to a specimen, and as a consequence the measured spectrum closely approximates the theoretical spectrum of a specimen suspended freely with no external contact in space.The present elasticity data permits the investigation of the thermodynamic properties of sodium chloride far above the Debye temperature when used together with the previous zero pressure data on thermal expansivity and heat capacity. Anharmonicity affecting the equation of state of sodium chloride is discussed in detail.One result is that the parameters in Decker's equation of state for NaCI are verified. Another result is that the thermal pressure for NaCI linearly increases with temperature, and is independent of volume, for temperatures above the Debye temperature.