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On the Structural Basis of the Presence of Two Optical Axes in alpha-HIO3 Crystal

机译:α-HIO3晶体中两个光轴的存在的结构基础

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An X-ray diffraction study of alpha-HIO3 crystal has been performed with the following results: sp. gr. P2(1)2(1)2(1), Z = 4, a = 5.5360(3) angstrom, b = 5.8723(6) angstrom, c = 7.7291(5) angstrom, and R factors R(F)/wR(F) = 0.86/0.69%. Disordering of iodine site is revealed, which is described in terms of anharmonic atomic displacements. Packing (likely unique) of all structure atoms over two systems of planes rotated by an angle close to the rotation of optical axes (47 degrees) is revealed. The rotation of the plane of polarization of light based on the structural data is calculated for the first time for the alpha-HIO3 crystal.
机译:对α-HIO3晶体进行了X射线衍射研究,得出以下结果: gr。 P2(1)2(1)2(1),Z = 4,a = 5.5360(3)埃,b = 5.8723(6)埃,c = 7.7291(5)埃和R因子R(F)/ wR (F)= 0.86 / 0.69%。揭示了碘位点的无序,用非谐原子位移来描述。揭示了所有结构原子在两个平面系统中的堆积(可能是唯一的),该平面的旋转角度接近光轴的旋转角度(47度)。对于α-HIO3晶体,首次基于结构数据计算出光的偏振面的旋转。

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