Borophosphates are of current interest and great importance as ultraviolet(UV)and deep-UV optical functional materials.However,most of the borophosphates exclusively contain tetrahedral coordination of B and P atoms,i...Borophosphates are of current interest and great importance as ultraviolet(UV)and deep-UV optical functional materials.However,most of the borophosphates exclusively contain tetrahedral coordination of B and P atoms,i.e.BO4 and PO_(4).Few compounds contain mixed-coordinated groups,i.e.BO4,BO3 and PO_(4).A new strategy of large B/P ratios has been suggested to effectively synthesize three mixed-coordinated borophosphates,K_(3)B_(4)PO_(10) and K_(2)MB_(4)PO_(10)(M=Rb/Cs).Their structures all show 2D 21[B_(4)PO_(10)]^(3-)sheets,which are separated by the alkali metal cations.The thermal behavior measurements indicate that K_(3)B_(4)PO_(10) and K_(2)MB_(4)PO_(10)(M=Rb/Cs)melt congruently and a crystal of K_(3)B_(4)PO_(10) with a size up to 4×2×1 mm^(3) has been grown.Property measurements show that they all possess deep-ultraviolet(UV)cut-off edges and a relatively large birefringence and are potential deep-UV birefringent crystals.In particular,the measured birefringence of K_(3)B_(4)PO_(10) is about 0.0445@532 nm,which is the largest in borophosphates with reported birefringence.This study indicates that B-rich borophosphates are promising systems to synthesize materials with large birefringence.展开更多
基金supported by the National Natural Science Foundation of China(grant No.51972230,22071179,61835014,51890864,and 51890865)Natural Science Foundation of Tianjin(19JCZDJC38200)+1 种基金National Key R&D Program(grant no.2016YFB0402103)Tianjin Science and Technology Plan Program(grant no.19ZYPTJC00070).
文摘Borophosphates are of current interest and great importance as ultraviolet(UV)and deep-UV optical functional materials.However,most of the borophosphates exclusively contain tetrahedral coordination of B and P atoms,i.e.BO4 and PO_(4).Few compounds contain mixed-coordinated groups,i.e.BO4,BO3 and PO_(4).A new strategy of large B/P ratios has been suggested to effectively synthesize three mixed-coordinated borophosphates,K_(3)B_(4)PO_(10) and K_(2)MB_(4)PO_(10)(M=Rb/Cs).Their structures all show 2D 21[B_(4)PO_(10)]^(3-)sheets,which are separated by the alkali metal cations.The thermal behavior measurements indicate that K_(3)B_(4)PO_(10) and K_(2)MB_(4)PO_(10)(M=Rb/Cs)melt congruently and a crystal of K_(3)B_(4)PO_(10) with a size up to 4×2×1 mm^(3) has been grown.Property measurements show that they all possess deep-ultraviolet(UV)cut-off edges and a relatively large birefringence and are potential deep-UV birefringent crystals.In particular,the measured birefringence of K_(3)B_(4)PO_(10) is about 0.0445@532 nm,which is the largest in borophosphates with reported birefringence.This study indicates that B-rich borophosphates are promising systems to synthesize materials with large birefringence.
