Herein,two new acentric borogermanates,namely,Ca_(2)GeB_(2)O_(7) and Ca_(1.78)Cd_(0.22)GeB_(2)O_(7),were obtained by combining BO4 with a GeO4 tetrahedron.The structures of the isomeric Ca_(2)GeB_(2)O_(7) and Ca_(1.78...Herein,two new acentric borogermanates,namely,Ca_(2)GeB_(2)O_(7) and Ca_(1.78)Cd_(0.22)GeB_(2)O_(7),were obtained by combining BO4 with a GeO4 tetrahedron.The structures of the isomeric Ca_(2)GeB_(2)O_(7) and Ca_(1.78)Cd_(0.22)GeB_(2)O_(7) feature two-dimensional(2D)[GeB2O7]layers parallel to the ab plane in which a GeO4 tetrahedron corner is shared with four[B2O7]units;the divalent cations are filled in between layers.Ca_(2)GeB_(2)O_(7) and Ca_(1.78)Cd_(0.22)GeB_(2)O_(7) display second-harmonic generation(SHG)intensity around 0.4 and 0.6 times that of KH2PO4(KDP),respectively.Ca_(2)GeB_(2)O_(7) possesses a short UV absorption edge(about 194 nm).Thermal stability measurements show that Ca_(2)GeB_(2)O_(7) melts congruently at high temperatures,whereas Ca_(1.78)Cd_(0.22)GeB_(2)O_(7) melts incongruently and becomes amorphous at high temperatures.Moreover,measurements of the optical properties as well as theoretical calculations of these two compounds were conducted.展开更多
基金supported by the National Natural Science Foundation of China(No.21875248,91622112,and 21701173)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB20000000)the 100 Talents Project of Fujian Province.
文摘Herein,two new acentric borogermanates,namely,Ca_(2)GeB_(2)O_(7) and Ca_(1.78)Cd_(0.22)GeB_(2)O_(7),were obtained by combining BO4 with a GeO4 tetrahedron.The structures of the isomeric Ca_(2)GeB_(2)O_(7) and Ca_(1.78)Cd_(0.22)GeB_(2)O_(7) feature two-dimensional(2D)[GeB2O7]layers parallel to the ab plane in which a GeO4 tetrahedron corner is shared with four[B2O7]units;the divalent cations are filled in between layers.Ca_(2)GeB_(2)O_(7) and Ca_(1.78)Cd_(0.22)GeB_(2)O_(7) display second-harmonic generation(SHG)intensity around 0.4 and 0.6 times that of KH2PO4(KDP),respectively.Ca_(2)GeB_(2)O_(7) possesses a short UV absorption edge(about 194 nm).Thermal stability measurements show that Ca_(2)GeB_(2)O_(7) melts congruently at high temperatures,whereas Ca_(1.78)Cd_(0.22)GeB_(2)O_(7) melts incongruently and becomes amorphous at high temperatures.Moreover,measurements of the optical properties as well as theoretical calculations of these two compounds were conducted.
