Anisotropic Optical Spectra of YAlO_3 (YAP) Single Crystals in the Vacuum Ultraviolet Region. II. Spectra of Reflectivity

概要

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Anisotropic reflectivity spectra of YAlO_3 single crystals at 297 K measured with the light polarized parallel to each of the a, b and c axes are presented in the range from 〜6.5 eV to 〜120 eV. A comparison of the reflectivity spectra of YAlO_3 with those of Y_2O_3, Y_3Al_5O_<12> and α-Al_2O_3 single crystals reaffirms that the peaks at 〜35 eV are mainly associated with the Y^<3+>4p^6 and the features beyond 〜76 eV with the Al^<3+>L_<2, 3>. Anisotropic reflectivity spectra at 10 K are shown in the region from 〜7 eV to 15 eV. Effective optical dielectric constants calculated by the sum rule including the imaginary part of the dielectric constant up to 〜120 eV are seen to saturate at the values corresponding to 98.0%〜99.7% of the literature values of the optical dielectric constant.
社団法人日本物理学会の論文
1994-05-15