System for ESR measurements at hydrostatic pressures to 60 kilobars.
System for ESR measurements at hydrostatic pressures to 60 kilobars.
复制标题
用于在 60 kbar 静水压力下进行 ESR 测量的系统。
DOI：
10.1063/1.1135405
复制
发表时间：
1978
期刊：
影响因子：
--
通讯作者：
H. M. Nelson
中科院分区：
文献类型：
--
作者：
J. D. Barnett;S. Tyagi;H. M. Nelson
单晶蓝宝石既用作固体微波腔（X波段），又用作布里奇曼砧压力几何形状中的砧。金属垫圈的使用方式与金刚石砧压力单元中的使用方式相似，单晶样品受到纯流体静压力的作用。采用红宝石荧光测压技术。样本量限于直径约0.6 mm、厚度约0.1 mm的圆盘。以60颗红宝石中Cr（3+）的ESR数据为例，说明了ESR的精度和数据质量。线条宽度和轮廓以及线条位置都是有意义的。在较高压力下，数据几乎没有退化。在P=0时，红宝石的零场分裂（δ）的一阶和二阶导数测量为ddelta/dP=（6.70+/-0.08）x 10（-4）cm（-1）λ（-1）和d（2）delta/dP（2）=（-2.44+/-0.30）x 10（-6）cm（-1）λ（-2）。旋磁比g（11）的变化小于2 × 10（-4）到60 μ s。
A single-crystal sapphire serves both as a solid microwave cavity (X band) and an anvil in a Bridgman-anvil pressure geometry. A metal gasket is used in a manner similar to its use in the diamond-anvil pressure cell, and single-crystal samples are subject to purely hydrostatic pressures. The ruby-fluorescence pressure-measurement technique is utilized. Sample size is limited to a disk approximately 0.6 mm in diameter and 0.1 mm thick. ESR data on Cr(3+) in ruby to 60 kilobars are given as an illustration of the precision and data quality. Line widths and profiles, as well as line positions, are meaningful. Very little degradation of the data is experienced at the higher pressures. The first and second derivatives of the zero-field splitting (delta) of the states in ruby with pressure are measured as ddelta/dP= (6.70+/-0.08) x 10(-4) cm(-1) kilobar(-1) and d(2)delta/dP(2)= (-2.44+/-0.30) x10(-6) cm(-1) kilobar(-2) at P=0. The gyromagnetic ratio g(11) is shown to experience a fractional change less than 2 x 10(-4) to 60 kilobars.