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首页> 外文期刊>Physical review >High-pressure Brillouin scattering of Pb(Mg_(1/3)Nb_(2/3))O_3
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High-pressure Brillouin scattering of Pb(Mg_(1/3)Nb_(2/3))O_3

机译:Pb(Mg_(1/3)Nb_(2/3))O_3的高压布里渊散射

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摘要

The pressure dependencies of the elastic constants and bulk modulus of single crystal Pb(Mg_(1/3)Nb_(2/3))O_3 (PMN) have been measured up to 10 GPa at room temperature by Brillouin spectroscopy. The elastic moduli and elastic anisotropy undergo an abrupt change at 4.5 GPa, indicative of a phase transition and consistent with earlier Raman and x-ray diffraction studies. We suggest that PMN undergoes a structural change from a cubic Pm3m to rhombohedral R3c phase at 4.5 GPa.
机译:通过布里渊光谱法在室温下测量了单晶Pb(Mg_(1/3)Nb_(2/3))O_3(PMN)的弹性常数和体积模量的压力依赖性。弹性模量和弹性各向异性在4.5 GPa处发生突然变化,表明发生了相变,并且与早期的拉曼和X射线衍射研究一致。我们建议PMN在4.5 GPa处经历从立方Pm3m到菱形R3c相的结构变化。

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