铁长石（Mg1-xFexO）的红外光学性质：实验与理论
Infrared Optical Properties of Ferropericlase (Mg1-xFexO): Experiment and Theory
摘要：
在295和6 K下，在宽频率范围（~50 ~ 32000 cm-1）内测量了氧化镁（MgO）和铁方镁石（Mg_（1-x）FexO，x=0.06和x=0.27）的反射光谱随温度的变化。复介电函数已确定从Kramers-Kronig分析的反射率。掺杂材料的光谱在红外区域类似于纯MgO，但具有更宽的共振。我们用壳模型计算了铁方镁石的介电函数，包括非谐声子-声子相互作用和无序散射。这些数据对于了解下地幔铁方镁石的导热性具有重要意义。
英文摘要：
The temperature dependence of the reflectance spectra of magnesium oxide (MgO) and ferropericlase (Mg1-xFexO, for x=0.06 and x=0.27) have been measured over a wide frequency range (~50 to 32000 cm-1) at 295 and 6 K. The complex dielectric function has been determined from a Kramers-Kronig analysis of the reflectance. The spectra of the doped materials resembles pure MgO in the infrared region, but with much broader resonances. We use a shell model to calculate the dielectric function of ferropericlase, including both anharmonic phonon-phonon interactions and disorder scattering. These data are relevant to understanding the heat conductivity of ferropericlase in the earth's lower mantle.
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