Angular dispersion of oblique phonon modes in BiFeO3 from micro-Raman scattering
Angular dispersion of oblique phonon modes in BiFeO3 from micro-Raman scattering
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DOI：
10.1103/physrevb.83.020101
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发表时间：
2011-01-10
影响因子：
3.7
通讯作者：
Reaney, I. M.
中科院分区：
文献类型：
--
作者：
Hlinka, J.;Pokorny, J.;Reaney, I. M.
通过对粗晶陶瓷样品的显微拉曼光谱研究，获得了多铁性 BiFeO3 中倾斜声子模式的角色散。测量的角色散曲线的连续性允许对所有纯区域中心极性模式进行最终识别。这里采用的方法是通过对宏观各向同性陶瓷样品进行大量独立的局部测量来重建各向异性晶体特性，该方法受益于铁电钙钛矿中倾斜模式的相当大的色散，并且原则上可以方便地应用于任何其他光学单轴铁电材料。
The angular dispersion of oblique phonon modes in a multiferroic BiFeO3 has been obtained from a micro-Raman spectroscopic investigation of a coarse grain ceramic sample. Continuity of the measured angular dispersion curves allows conclusive identification of all pure zone-center polar modes. The method employed here to reconstruct the anisotropic crystal property from a large set of independent local measurements on a macroscopically isotropic ceramic sample profits from the considerable dispersion of the oblique modes in ferroelectric perovskites and it can be in principle conveniently applied to any other optically uniaxial ferroelectric material.