Rb2Na(NO3)3: A Congruently Melting UV-NLO Crystal with a Very Strong Second-Harmonic Generation Response

Abstract

Crystals of congruently melting noncentrosymmetric (NCS) mixed alkali metal nitrate, Rb 2 Na(NO 3 ) 3 , have been grown through solid state reactions. The material possesses layers with NaO 8 hexagonal bipyramids and NO 3 triangular units. Rb + cations are residing in the interlayer space. Each NaO 8 hexagonal bipyramid shares its corners and edges with two and three NO 3 units, respectively, in order to fulfill a highly dense stacking in the unit cell. The NaO 8 groups share their six oxygen atoms in equatorial positions with three different NO 3 groups to generate a NaO 6 -NO 3 layer with a parallel alignment. The optimized arrangement of the NO 3 groups and their high density in the structure together produce a strong second-harmonic generation (SHG) response. Powder SHG measurements indicate that Rb 2 Na(NO 3 ) 3 has a strong SHG efficiency of five times that of KH 2 PO 4 (KDP) and is type I phase-matchable. The calculated average nonlinear optical (NLO) susceptibility of Rb 2 Na(NO 3 ) 3 turns out to be the largest value among the NLO materials composed of only [NO 3 ]á nion. In addition, Rb 2 Na(NO 3 ) 3 exhibits a wide transparency region ranging from UV to near IR, which suggests that the compound is a promising NLO material.

Polar phase transitions in heteroepitaxial stabilized La0.5Y0.5AlO3thin films

“…31). In particular, it has been reported that for both symmetries, the expressions of the SH polar plots have the same form yet only with different values of the tensor elements 33. 35 Therefore we speculate that the anomaly behavior observed on the temperature dependent SH curve at Ta ~ 160 K is a hallmark of polarpolar phase transition between Pmc21 and Pmn21.…”

Inorganic planar π-conjugated groups in nonlinear optical crystals: review and outlook

“…18. 62 In this compound, the Na atom is coordinated with 10 oxygen atoms, which are further connected with five [NO 3 ] units to construct the FBUs. These 31 pm V −1 and 0.115 at 1064 nm, respectively.…”

An Overview on Recent Trends in Deep‐Ultraviolet (DUV) and Ultraviolet (UV) Nonlinear Optical Crystals

“…By using the hydrothermal method, Lixian Chang et al [56] synthesized a nitrate NLO crystal of Pb 16 (OH) 16 Congruently melting noncentro symmetry crystal with mixed alkali metal nitrate was grown by Guohong Zou et al [57] SXRD shows that the Rb 2 Na(NO 3 ) 3 56 crystal falls under the noncenrtrosymmetric Pmc2 1 space group. The grown crystal exhibits a layered structure which was made up of NO 3 trigonal plane and NaO 8 hexagonal bypyramids group.…”

“…Congruently melting noncentro symmetry crystal with mixed alkali metal nitrate was grown by Guohong Zou et al [57] . SXRD shows that the Rb 2 Na(NO 3 ) 3 56 crystal falls under the noncenrtrosymmetric Pmc2 1 space group.…”