Second harmonic generation in boracites

Abstract

The M 3 B 7 O 13 X (M = Mg, Ni, Cd; X = Cl, Br, I) boracites were synthesized and characterized by x-ray diffraction and second harmonic generation. Their nonlinear optical susceptibility was estimated using the Phillips-Van Vechten-Levine model. The results demonstrate that the nature of the halogen has an insignificant effect on the second-order nonlinear response of the boracites.

Where the extraordinaries meet: a cascade of isosymmetrical superionic phase transitions and negative thermal expansion in a novel silver salt-inclusion borate halide

“…Such architectures are considered to be host–guest, templated, or salt-inclusion structures 10 with rather smeared borderlines. The most thoroughly studied borate-halide families are synthetic analogs of hilgardite (M II 2 B 5 O 9 X), 11 boracite (M II 3 B 7 O 10 X), 12 and anti -perovskite-derived (M I 3 B 6 O 10 X 13 ), where M = alkali cation and X = halide anion. The latter family has been studied by Pan et al , and several alternative structures, including a centrosymmetric and two acentric ones, were discovered.…”

New Facile Method for the Preparation of M3B7O13I Boracites (M = Mn, Fe, Co, Ni, Cd)

“…The unusual physical and chemical properties, such as ferroelectric, magnetic, dynamical, and structural properties of boracites, M 3 B 7 O 13 X (M = divalent metals Mg, Cr, Mn, Fe, Co, Ni, Cu, Zn, Cd; X = usually Cl, Br, I), which represents a family of more than 25 isomorphous compounds, have been the focus of research for many years . Usually, boracites have been prepared by four basic techniques, which include vapor-transport-type methods, , sintering-flux-type methods, , sol–gel processes, and hydrothermal methods . In the vapor-transport method, for example, HX and MX 2 acted as the gas-transport agent, as indicated by the represented reactions listed below: MO + 2 HX ( g ) = MX 2 ( g ) + normalH 2 normalO ( g ) 6 MX 2 ( g ) + 7 normalB 2 normalO 3 + 5 normalH 2 normalO ( g ) = 2 normalM 3 normalB 7 normalO 13 normalX + 10 HX ( g ) whereas in a typical sintering-flux method boric acid acted as the flux: 3 CoCl 2 · 6 normalH 2 normalO + 7 …”

“…Usually, boracites have been prepared by four basic techniques, which include vapor-transport-type methods, , sintering-flux-type methods, , sol–gel processes, and hydrothermal methods . In the vapor-transport method, for example, HX and MX 2 acted as the gas-transport agent, as indicated by the represented reactions listed below: MO + 2 HX ( g ) = MX 2 ( g ) + normalH 2 normalO ( g ) 6 MX 2 ( g ) + 7 normalB 2 normalO 3 + 5 normalH 2 normalO ( g ) = 2 normalM 3 normalB 7 normalO 13 normalX + 10 HX ( g ) whereas in a typical sintering-flux method boric acid acted as the flux: 3 CoCl 2 · 6 normalH 2 normalO + 7 normalH 3 BO 3 = Co 3 normalB ...…”