Synthesis, Structural Characterization and Properties of Two Strontium Borates Constructed from Oxo Boron Clusters

Synthesis, characterization and theoretical studies of nonlinear optical crystal Sr2B5O9(OH)·H2O

“…15 Other favorable features include the structural versatilities derived from the different combination types of the BO 3 and BO 4 groups, [16][17][18][19] as well as the UV transparency of the basic structural units (strontium polyhedra, borate groups and hydroxyl groups) that usually connected each other through small electrostatic interactions in strontium borates. To date, about a dozen strontium borates have been synthesized and structurally determined, [20][21][22][23][24][25][26][27][28][29] and of these, only several crystals are acentric, which satisfy the critical prerequisite requirements for the bulk NLO activity. a-SrB 4 O 7 has been explored to have a very high effective NLO coefficient; however, the birefringence of a-SrB 4 O 7 is too small to realize phase matching for SHG.…”

“…26 Crystal Sr 2 B 6 O 9 (OH) 4 is a new phase in the strontium borate system and exhibits an SHG response of approximately 1.5 times that of KDP. 27 Very recently, we reported the investigations of the new strontium borate, Sr 4 B 10 O 18 (OH) 2 Á2H 2 O (space group P1, No. 1), which exhibits a powder SHG response of approximately 2 times that of KDP.…”

“…28 A continuous effort made in the strontium borate system has led to the title compound, Sr 2 B 5 O 9 (OH)ÁH 2 O. The synthesis and crystal structure of Sr 2 B 5 O 9 (OH)ÁH 2 O were first reported by Barbier, 29 and recently, reexamined by Yang, et al 27 In this paper, we focus on the high yield synthesis and the comprehensive characterization of the linear-and nonlinearoptical properties that are important for the application as a UV NLO crystal. In addition, theoretical studies were carried out to deepen the understanding of the origins of the optical properties.…”

Sr2[B5O8(OH)]2 ⋅ [B(OH)3] ⋅ H2O: A Strontium Borate That Shows Deep‐Ultraviolet‐Transparent Nonlinear Optical Properties

“…[26] Several recent examples of strontium borates are Sr 3 B 6 O 11 (OH) 2 (P � 1), [27] Sr 3 B 14 O 24 (P2 1 /c), [28] Sr 4 B 10 O 18 (OH) 2 • 2H 2 O (P1), [29] Sr 2 B 5 O 9 (OH) • H 2 O (C2), [30] and Sr 2 [B 6 O 9 (OH) 4 ] (P2 1 ). [31] Different polyborate anions from [B 5 O 12 ] 9À to [B 14 O 30 ] 18À are observed in these strontium borates. The latter three are noncentrosymmetric, Sr 2 B 5 O 9 (OH) • H 2 O is a UV NLO material with the largest second-harmonic-generation (SHG) response (3×KH 2 PO 4 , KDP) in strontium borates.…”

“…SrB 4 O 7 shows wide transparency band, large NLO coefficients, high optical damage threshold and excellent mechanical strength [26] . Several recent examples of strontium borates are Sr 3 B 6 O 11 (OH) 2 ( P $${\bar{1}}$$ ), [27] Sr 3 B 14 O 24 ( P 2 1 / c ), [28] Sr 4 B 10 O 18 (OH) 2 ⋅ 2H 2 O ( P 1), [29] Sr 2 B 5 O 9 (OH) ⋅ H 2 O ( C 2), [30] and Sr 2 [B 6 O 9 (OH) 4 ] ( P 2 1 ) [31] . Different polyborate anions from [B 5 O 12 ] 9− to [B 14 O 30 ] 18− are observed in these strontium borates.…”