Pb2Cd(SeO3)2X2 (X = Cl and Br): two halogenated selenites with phase matchable second harmonic generation. Issue 11 (25th September 2019)

• Record Type: Journal Article
• Authors: Gong, Ya-Ping; Hu, Chun-Li; Ma, Yun-Xiang; Mao, Jiang-Gao; Kong, Fang
• Is Part Of: Inorganic chemistry frontiers. Volume 6:Issue 11(2019)
• Page Start: 3133
• Page End: 3139
• Publication Date: 2019-09-25
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c9qi00936a
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : The second harmonic generation (SHG) efficiencies of Pb2 Cd(SeO3 )2 X2 (X = Cl and Br) are higher than that of commercial KDP (KH2 PO4 ) and their laser damage thresholds are 30 times more than that of AGS (AgGaS2 ). Abstract : Two new halogenated selenites, namely, Pb2 Cd(SeO3 )2 X2 (X = Cl and Br), were synthesized via mild hydrothermal reactions. The isomorphic compounds crystallized in a noncentrosymmetric (NCS) and chiral space group. Their three-dimensional (3D) structures were formed by alternating undulated [Pb2 (SeO3 )X]∞ + cationic layers and flattened [Cd(SeO3 )X]∞ − anionic layers. Thermal analyses revealed that the compounds can remain stable up to 500 °C. The SHG efficiencies of Pb2 Cd(SeO3 )2 X2 (X = Cl and Br) are much higher than those of commercial KDP (KH2 PO4 ), and they are phase-matchable. UV-vis-NIR diffuse reflectance spectra revealed that the two compounds exhibited wide optical band gaps. The laser damage thresholds of Pb2 Cd(SeO3 )2 X2 (X = Cl and Br) were measured to be about 38.5 and 35.7 times higher than that of AGS (AgGaS2 ). Their calculated birefringences were large enough to accomplish phase matching in SHG progression. The SHG density analyses disclosed that the lone pair electrons of the SeO3 and PbO n X m units made major contributions to their nonlinear efficiencies.