Инд. авторы: Bekker T.B., Vedenyapin V.N., Khamoyan A.G.
Заглавие: Birefringence of the new fluoride borates Ba2Na3[B3O6]2F and Ba7(BO3)4−yF2+3y in the Na, Ba, B//O, F quaternary reciprocal system
Библ. ссылка: Bekker T.B., Vedenyapin V.N., Khamoyan A.G. Birefringence of the new fluoride borates Ba2Na3[B3O6]2F and Ba7(BO3)4−yF2+3y in the Na, Ba, B//O, F quaternary reciprocal system // Materials Research Bulletin. - 2017. - Vol.91. - P.54-58. - ISSN 0025-5408. - EISSN 1873-4227.
Внешние системы: DOI: 10.1016/j.materresbull.2017.03.024; РИНЦ: 29489238; SCOPUS: 2-s2.0-85016154768; WoS: 000401388800009;
Реферат: eng: The birefringence of the new Ba2Na3[B3O6]2F (BNBF) (P63/m) and Ba7(BO3)4−yF2+3y (P63) phases has been investigated. Coefficients of the Sellmeier equations have been determined. Parallel [B3O6]3− rings in the Ba2Na3[B3O6]2F structure generate the major anisotropic polarizabilities and produce large birefringence Δn = 0.1097 − 0.0428 from 350 nm to 5 μm, comparable to that of commercial birefringent crystal α-BaB2O4. A new flux for growing a high quality BNBF crystal has been proposed. In the measured wavelength range from 266 nm to 1.7 μm noncentrosymmetric phase Ba7(BO3)4−yF2+3y (y = 0.49) exhibits low birefringence Δn = 0.0111 − 0.0037 which can be accounted for non-coplanar arrangement of the anionic groups in the structure. Low birefringence prevents the use of this crystal for nonlinear optical applications, since phase-matching conditions for second harmonic generation can not be reached. © 2017 Elsevier Ltd
Ключевые слова: Crystal growth from solution; Sodium fluoride; Sellmeier equation; Phase matching conditions; Nonlinear optical applications; Large birefringence; Growth from high-temperature solutions; Birefringent crystals; Sodium borate; Sodium; Phase matching; O rings; Nonlinear optics; Fluorine compounds; Crystal structure; Birefringence; Crystal growth from high-temperature solution; Birefringence; Barium-sodium fluoride borates; Non-centrosymmetric;
Издано: 2017
Физ. характеристика: с.54-58