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High-pressure Raman and x-ray diffraction studies on LaB_6

机译:LaB_6的高压拉曼和X射线衍射研究

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摘要

X-ray diffraction measurements and Raman spectroscopy at room temperature document the equation of state and the frequency shifts for E_g, T_(2g), and A_(1g) vibrational modes of polycrystalline LaB_6 under pressure. The data exhibit smooth pressure dependencies, yielding a zero-pressure isothermal bulk modulus K_(0T) = 164(±2) GPa in good accord with independent ultrasonic measurements, and show no evidence of structural or electronic phase transitions up to at least 25 GPa.
机译:室温下的X射线衍射测量和拉曼光谱记录了多晶LaB_6在压力下的E_g,T_(2g)和A_(1g)振动模式的状态方程和频移。数据显示出平滑的压力依赖性,与独立的超声测量结果非常吻合,得出零压力等温体积模量K_(0T)= 164(±2)GPa,并且没有证据表明结构或电子相变至少达到25 GPa 。

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