Journal ArticleDOI
Birefringence of CaCO3 and Electronic Polarizabilities of the Constituent Ions
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In this paper, the birefringence of CaCO 3 is discussed taking account of dipole interaction among the Ca ++ and CO 3 -ions, and the electronic rolarizabilities of the CO 3- -ions are obtained as α 1 =3.18 ×10 -24 cm 3 and α 2 =4.20 × 10 - 24 cm 3 in the direction parallel and perpendicular to the optical axes respectively for n e =1.486 and n 0 = 1.658.Abstract:
The birefringence of CaCO 3 is discussed taking account of dipole interaction among the Ca ++ and CO 3 - -ions. The electronic rolarizabilities of the CO 3 - -ions are obtained as α 1 =3.18 ×10 -24 cm 3 and α 2 =4.20 ×10 -24 cm 3 in the direction parallel and perpendicular to the optical axes respectively for n e =1.486 and n 0 =1.658. The bond polarizabilities of C-O can be obtained as α // =1.74 ×10 -24 cm 3 and α ⊥ = 1.06 ×10 -24 cm 3 in the directions parallel and perpendicular to the direction of the line connecting C and O respectively with anisotropic ratio α // /α ⊥ =1.64.read more
Citations
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Empirical electronic polarizabilities in oxides, hydroxides, oxyfluorides, and oxychlorides
TL;DR: In this article, an extensive set of infinite-wavelength refractive indices derived from a single-oscillator Sellmeier equation was used to obtain mean total polarizabilities for 340 oxides, 3 hydroxides, 46 oxyhydroxide, 10 oxyfluorides, 8 oxychlorides, 80 hydrates, and 51 fluorides.
Journal ArticleDOI
Prospects for Fluoride Carbonate Nonlinear Optical Crystals in the UV and Deep-UV Regions
TL;DR: In this paper, the potential of fluoride carbonate nonlinear optical (NLO) crystals in the ultraviolet (UV) and deep-UV regions is investigated with first-principles simulations and materials design considerations.
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New Fluoride Carbonates: Centrosymmetric KPb2(CO3)2F and Noncentrosymmetric K2.70Pb5.15(CO3)5F3
T. Thao Tran,P. Shiv Halasyamani +1 more
TL;DR: K2.70Pb5.15(CO3)5F3 is noncentrosymmetric, and crystallizes in the achiral and nonpolar space group P6̅m2 (crystal class -6m2), and Powder second-harmonic generation (SHG) measurements revealed a SHG efficiency of approximately 40 × α-SiO2.
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Natural and Synthetic Fluoride Carbonates
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Ba4M(CO3)(2)(BO3)(2) (M=Ba, Sr): two borate-carbonates synthesized by open high temperature solution method
TL;DR: In this article, two borate-carbnate structures were determined by single crystal X-ray diffraction and they both crystallize in same space group, Pnma.
References
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Journal ArticleDOI
Electronic Polarizabilities of Ions in Crystals
TL;DR: In this paper, a set of electronic polarizabilities has been obtained from a least-squares fit of experimental refraction data using simple additivity and a Lorentz factor of $\frac{4\ensuremath{\pi}}{3}$.
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The Refractive Indices of Calcite and Aragonite
TL;DR: In this paper, it was shown that double refraction can be explained by the atomic arrangements in the crystals of calcium carbonate, calcite and aragonite, and that the influence of the neighbouring doublets on an atom depends on the orientation of the electric field with reference to the crystal axes.