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首页> 外文期刊>Physical review >Lattice dynamics and high-pressure Raman scattering studies of ferroelectric K_2MgWO_2(PO_4)_2
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Lattice dynamics and high-pressure Raman scattering studies of ferroelectric K_2MgWO_2(PO_4)_2

机译：铁电K_2MgWO_2（PO_4）_2的晶格动力学和高压拉曼散射研究

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摘要

K_2MgWO_2(PO_4)_2 ferroelectric single crystal, derived from KTiOPO_4 (KTP) by replacement of two Ti~(4+) ions with Mg~(2+) and W~(6+) cations, was investigated at ambient pressure by micro-Raman scattering and infrared spectroscopies with a focus on polarization properties of vibrational modes. These results were analyzed based on classical lattice dynamics calculations which allowed to propose the normal-mode symmetries and assignments. In addition to the ambient pressure studies, high-pressure Raman scattering studies were performed. These studies showed the onset of a reversible first-order phase transition near 2.0 GPa which is associated with marked softening of the low wave number mode corresponding to motions of the K~+ ions. The structural changes at the phase transition are relatively weak and either the crystal exhibits transformation from the ambient pressure P1 to a high-pressure monoclinic structure or there is no symmetry change at the phase transition, i.e., this transition is isosymmetric.
机译：在环境压力下，通过微结构研究了由KTiOPO_4（KTP）通过用Mg〜（2+）和W〜（6+）阳离子取代两个Ti〜（4+）离子而衍生的K_2MgWO_2（PO_4）_2铁电单晶。拉曼散射和红外光谱学着重于振动模式的偏振特性。基于经典的晶格动力学计算对这些结果进行了分析，这些计算允许提出正态对称性和分配。除环境压力研究外，还进行了高压拉曼散射研究。这些研究表明，在接近2.0 GPa时出现了可逆的一阶相变，这与对应于K +离子运动的低波数模的明显软化有关。相变时的结构变化相对较弱，或者晶体表现出从环境压力P1到高压单斜晶结构的转变，或者在相变时不存在对称变化，即该跃迁是等对称的。

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