8 May 2013 Structural field of K2Al2B2O7-family crystals
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The known crystal structures of borate compounds with general composition AI 2MIII 2B2O7 (AI: Na, K, Cs, Rb) have been considered. The structures in space groups P63/m, P-31c, P321 and P21/c have been found depending on cation combination. Criterion k = (r(MIII)+r(B)+2r(O))/r(AI) has been formulated and it controls the formation of trigonal K2Al2B2O7 (KABO) type structure. The existence of noncentrosymmetric KABO-type borates is possible over the range of k = 2.7 – 2.06. This range is promising for searching new borate crystals and solid solutions with pronounced nonlinear optical properties.
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Victor V. Atuchin, Victor V. Atuchin, Bair G. Bazarov, Bair G. Bazarov, Victoria G. Grossman, Victoria G. Grossman, Maxim S. Molokeev, Maxim S. Molokeev, Zhibzema G. Bazarova, Zhibzema G. Bazarova, "Structural field of K2Al2B2O7-family crystals", Proc. SPIE 8772, Nonlinear Optics and Applications VII, 87721O (8 May 2013); doi: 10.1117/12.2017099; https://doi.org/10.1117/12.2017099


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