MgCNi_3超导体在静水压下的弹性性质  

Elastic Properties of MgCNi_3 Superconductor under Hydrostatic Pressure

作　　者：周波[1] 王汝菊[1] 张友林[1] 李凤英[1] 禹日成[1] 靳常青[1] 

机构地区：[1]中国科学院物理研究所,北京100080

出　　处：《高压物理学报》2003年第2期157-160,共4页Chinese Journal of High Pressure Physics

摘　　要：在 0 .1MPa到 0 .5GPa压力范围内 ,采用脉冲回波重合法 (Pulse EchoOverlapMethod)测量了MgCNi3超导体的横波及纵波声速 ,计算了体弹模量B、剪切模量G等弹性参数以及德拜温度、比热等热力学参数随压力的变化。常压下的ΘD 与cV 的值分别为 45 4 .82K和1 1 1 .3 0J/(mol·K)。对B p曲线作线性拟合 ,得到体弹模量B0 在零压附近的导数B′0 。Using Pulse-Echo Overlap Method, the velocities of longitudinal and shear waves of Ceramic MgCNi 3 superconductor were measured up to hydrostatic pressure of 0 5 GPa.The bulk modulus B,shear modulus G,Debye temperature and specific heat under pressure were calculated.The values of Debye temperature Θ D and specific heat c V under ambient condition are 454 82 K and 111 30 J/(mol·K),respectively.The B-p curve was fitted linearly to obtain B ′ 0,the first order derivative of bulk modulus at zero pressure.The Murnaghan equation of state was established.

关 键 词：MGCNI3 超导体 静水压 弹性性质 钙钛矿结构 富镍合金 超导电性 弹性模量 

分 类 号：TM263[一般工业技术—材料科学与工程] O511[电气工程—电工理论与新技术]