Barnett J D, Tyagi S D, Nelson H M
Department of Physics and Astronomy, Brigham Young University, Provo, UT 84602, USA.
Rev Sci Instrum. 1978 Mar;49(3):348. doi: 10.1063/1.1135405.
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.
一块单晶蓝宝石既作为一个固体微波腔（X波段），又作为布里奇曼砧座压力装置中的砧座。金属垫片的使用方式与它在金刚石砧座压力装置中的使用方式类似，单晶样品受到的是纯静水压力。采用了红宝石荧光压力测量技术。样品尺寸限制为直径约0.6毫米、厚0.1毫米的圆盘。给出了红宝石中Cr(3+)在60千巴压力下的电子自旋共振数据，以说明测量精度和数据质量。线宽、线型以及谱线位置都是有意义的。在较高压力下数据几乎没有退化。在压力P = 0时，测量得到红宝石中各能态的零场分裂（δ）随压力的一阶导数和二阶导数分别为ddelta/dP = (6.70±0.08)×10^(-4)厘米^(-1)千巴^(-1)和d(2)delta/dP(2)= (-2.44±0.30)×10^(-6)厘米^(-1)千巴^(-2)。旋磁比g(11)在60千巴压力下的分数变化小于2×10^(-4)。
