The Crystal Structure of Strontium Diborate, SrO.2B2O3.

Optical spectroscopy of Li2B4O7, CaB4O7 and LiCaBO3 borate glasses doped with europium

“…The Sr-O distances in the SrB 4 O 7 crystal are in the region of 0.273÷0.339 nm [52]. The coordination number to oxygen for Sr atoms depends on the Sr-O distances and equals to four when the radius of the first coordination shell is less than 0.290 nm [52]. According to Refs.…”

“…Two types of BO 4 tetrahedra with similar B-O distances, which are characteristic for the crystal lattice of SrB 4 O 7 [52], have not been resolved in the intensity curve and the pair correlation function for the SrB 4 O 7 glass [32]. The Sr-O distances in the SrB 4 O 7 crystal are in the region of 0.273÷0.339 nm [52]. The coordination number to oxygen for Sr atoms depends on the Sr-O distances and equals to four when the radius of the first coordination shell is less than 0.290 nm [52].…”

“…For characterization of this compound, one can use the structural data [32,50] for the isomorphic SrB 4 O 7 glasses. According to the structural data available for those glasses [32,50] and the crystals with the same composition [52], the structure of the CaB 4 O 7 glasses may be supposed to consist of BO 4 tetrahedra, with the average B-O distance equal to about 0.140 nm. Two types of BO 4 tetrahedra with similar B-O distances, which are characteristic for the crystal lattice of SrB 4 O 7 [52], have not been resolved in the intensity curve and the pair correlation function for the SrB 4 O 7 glass [32].…”

“…According to Refs. [32,52], Sr(Ca) atoms should be stabilized in the SrB 4 O 7 (CaB 4 O 7 ) glass network at the sites with the coordination number N = 4 to oxygen, where the average distance Sr-O (Ca-O) is equal to about 0.262 nm [32].…”

Growth of transparent SrB₄O₇ crystal fiber by the μ-PD method

“…In addition, we considered the generation mechanism of voids in the SBO crystals by using the relation between the growth rate of SBO crystals and the diffusion rate of voids. Among these noble borate crystals, SrB4O7 (SBO) has attracted much attention as a nonlinear crystal in the DUV region because of its superior transparency in the vacuum UV region, high radiation damage threshold, and high nonlinearity [4][5][6]. This crystal belongs to the Pnm21 space group and has unit cell parameters a = 4.4255 Å, b = 10.709 Å, C = 4.231 Å, and Z = 2 [7].…”