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首页> 外文期刊>Physics of the solid state >Optical properties of BiFeO_3 ceramics in the frequency range 0.3-30.0 THz
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Optical properties of BiFeO_3 ceramics in the frequency range 0.3-30.0 THz

机译：BiFeO_3陶瓷在0.3-30.0 THz频率范围内的光学特性

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Reflection and transmission infrared spectra of BiFeO_3 ceramic samples have been measured using submillimeter spectroscopy (on a backward-wave tube spectrometer) and Fourier-transform infrared spectroscopy in the frequency range from 5 to 1000 cm~(-1) at temperatures in the range from 10 to 500 K. New resonant modes (probably, magnetic in nature) with the eigenfrequencies decreasing with an increase in the temperature have been recorded in the range 10-30 cm~(-1) by IR spectroscopy for the first time. An additional absorption with a fairly large dielectric contribution has been revealed in the range 30-60 cm~(-1). It has been demonstrated that the corresponding oscillators couple with both the lowest frequency phonon mode and the magnetic subsystem.
机译：BiFeO_3陶瓷样品的反射和透射红外光谱已使用亚毫米波光谱仪（在后波管光谱仪上）和傅立叶变换红外光谱仪在5至1000 cm〜（-1）的频率范围内， 10至500K。首次通过红外光谱在10-30 cm〜（-1）范围内记录了特征频率随温度升高而降低的新共振模式（本质上可能是磁性共振）。在30-60 cm〜（-1）范围内发现了具有相当大的介电贡献的附加吸收。已经证明，相应的振荡器与最低频率的声子模式和磁性子系统耦合。

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