Rb₇SrY₂(B₅O₁₀)₃: A Rare-Earth Pentaborate with Moderate Second-Harmonic Response and Interesting Phase-Matching Behavior

Abstract

Phase-matchable (PM) capacity is an indispensable factor in evaluating the applicable prospect of a new nonlinear optical crystal. Obtaining an accurate and credible PM curve by the Kurtz−Perry method using a small single crystal is indeed crucial. Here, we reported a new borate NLO crystal Rb 7 SrY 2 (B 5 O 10 ) 3 (I) and studied the influence of the arrangement of micro-[B 5 O 10 ] groups on its birefringence. Interestingly, the synthesized polycrystalline powder and grinded single crystal display divergent PM and non-PM behavior, respectively. Combining theoretical calculations and analysis, I is demonstrated to be non-phase matchable for the secondharmonic generation (SHG) process of a 1064 nm laser.

Large Magnetocaloric Effect in Li3K9Gd3(BO3)7 Crystal Featuring Sandwich-Like Three-Dimensional Framework

“…The out-of-plane degenerate bending vibration of [BO 3 ] 3– groups is clearly identified by the peak at around 779 cm –1 . These results are consistent with other compounds containing [BO 3 ] 3– , − which further prove the correctness of Li 3 K 9 Gd 3 (BO 3 ) 7 single crystal structure determination.…”

Borates: A Rich Source for Optical Materials

“…A series of mixed-metal rare earth borates with the general formula of A 7 MRE 2 (B 5 O 10 ) 3 were continually reported by many groups, − in which A represents mono-alkali metal or mixed alkali metals, M site can be alkaline-earth metal or divalent post-transition metal (like Zn, Cd, Pb, etc . ), and RE refers rare-earth metal.…”

“…For those mixed alkali and alkaline-earth metal members consisting of the RE atoms with closed-shell electronic configurations or half-occupied 4 f orbitals, i.e. , Y, Sc, La, Gd, and Lu, they can be transparent down to 190 nm. − , Their SHG responses range from 0.4 to 2.1 × KDP under 1064 nm, which is tuned by different A-, M-, and RE-sites anions, but such NLO effects are not competitive compared with those of other rare earth NLO materials. − It should be noted that more borates can be obtained by chemical substitution and co-substitution strategy based on the template of A 7 MRE 2 (B 5 O 10 ) 3 , which provides a good model to study the effects of A-site metal cation on structure and property. At present, large single crystals of this family have not been grown, as such birefringence, SHG coefficients, and laser damage threshold have not been measured or determined experimentally.…”

Nonlinear-Optical Crystal Rb3YB6O12 with Condensed B5O10 Blocks That Exhibits an Intriguing Structural Arrangement and a Short Ultraviolet Absorption Edge

“…Notably, the borate family K 7 MRE 2 B 15 O 30 (M = alkaline earth and Zn, Cd, and Pb; RE = rare earth and Bi) with versatile chemical compositions and a large NLO effect have been found by the Pan group since 2017. , Soon afterward, the NLO borate materials containing B 5 O 10 groups received more attention. For example, the compounds Rb 7 SrY 2 (B 5 O 10 ) 3 and Rb 7 SrGd 2 (B 5 O 10 ) 3 with interesting NLO and magnetic properties were synthesized. In 2019, the scandium-based borates K 6 ACaSc 2 (B 5 O 10 ) 3 (A = Li, Na, and Li 0.7 Na 0.3 ) with short UV cutoff edges were discovered by the Mao group.…”