A. D. Molchanova, S. A. Klimin, V. A. Chernyshev, K. N. Boldyrev, A. R. Valiev, D. N. Karimov
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引用次数: 0
摘要
摘要 首次利用光学光谱方法研究了从熔体中生长出来的氟化铋 BiF3 晶体，并根据第一原理计算了声子激发区。对偏振光下的红外反射光谱进行了研究。获得了光学声子的参数。在红外反射光谱中，可以观察到导电材料特有的 <500 cm-1 范围内的低频上升。在德鲁德-洛伦兹模型的框架内对反射光谱进行了分析，并考虑了离子导电性的贡献。对 BiF3 晶体的声子光谱进行了 ab initio 计算，并分析了理论数据与实验数据之间的关系。
Phonons and Features Due to Ionic Conductivity in the Reflection Spectra of BiF3 Crystal
Crystals of bismuth fluoride BiF3 grown from a melt were studied for the first time by optical spectroscopy methods and calculated from first principles in the phonon excitations region. A study of IR reflectance spectra in polarized light was carried out. The parameters of optical phonons were obtained. In the IR reflectance spectra, a low-frequency rise in the range <500 cm–1, characteristic of conductive materials, is observed. The reflection spectra were analyzed within the framework of the Drude–Lorentz model, taking into account the contribution of ionic conductivity. An ab initio calculation of the phonon spectrum of a BiF3 crystal was carried out and the relationship between theoretical and experimental data was analyzed.
期刊介绍：
Optics and Spectroscopy (Optika i spektroskopiya), founded in 1956, presents original and review papers in various fields of modern optics and spectroscopy in the entire wavelength range from radio waves to X-rays. Topics covered include problems of theoretical and experimental spectroscopy of atoms, molecules, and condensed state, lasers and the interaction of laser radiation with matter, physical and geometrical optics, holography, and physical principles of optical instrument making.
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