The phase diagram of BaB_2O_4-Na_2B_2O_4-K_2B_2O_4 ternary system has been studied by combination of experimental measurement with theoretical calculation.On the basis of selfconsistent thermodynamic analysis of three...The phase diagram of BaB_2O_4-Na_2B_2O_4-K_2B_2O_4 ternary system has been studied by combination of experimental measurement with theoretical calculation.On the basis of selfconsistent thermodynamic analysis of three sub-binary phase diagrams,the optimized the- rmodynamic data of these sub-binary systems are extrapolated to ternary system by asymmet- rical Toop approach,and the BaB_2O_4-Na_2B_2O_4-K_2B_2O_4 ternary phase diagram is calculated. In comparison with a measured typical vertical section,the calculated ternary phase diagram is quite satisfactory.展开更多
Hydrothermal treatment of calcium oxide and boric acid mixtures at temperaturesbetween 234 ℃ and 300 ℃ has produced a colorless, transparent, orthorhombic compound Ca2B6O11 · H2O. Of the seven known members of ...Hydrothermal treatment of calcium oxide and boric acid mixtures at temperaturesbetween 234 ℃ and 300 ℃ has produced a colorless, transparent, orthorhombic compound Ca2B6O11 · H2O. Of the seven known members of the series of hydrated dicalcium hexaborate containing boron-oxygen six-membered ring anionic group (B3O8)7, only the title compound has been found to have the nonlinear optical effect. The second harmanic generation (SHG) effect of its crystal is larger than that of KH2PO4 (KDP). The reflection spectrum has shown that this compound has no absorption in the experimental wavelength range (800-240 nm). Its crystal structure is favorable for generating the nonlinear optical effect.展开更多
Polycrystal Li_(2)B_(4)O_(7)(LBO)doped with Cu and In was prepared and then sintered at different temperatures.X-ray diffraction(XRD)was applied to get the parameters of the LBO structure,thermoluminescence(TL)and opt...Polycrystal Li_(2)B_(4)O_(7)(LBO)doped with Cu and In was prepared and then sintered at different temperatures.X-ray diffraction(XRD)was applied to get the parameters of the LBO structure,thermoluminescence(TL)and optically stimulated luminescence(OSL)were measured,and a second-order exponential decay model was fitted to the OSL decay curves.The results indicate that the original number of OSL traps that have captured electrons is linearly related with the sum of TL decay during the OSL process.Mean decay constant of OSL is related to the sintered temperature.The possible reason is that the sintered temperature affects the crystal sizes of the polycrystal,and consequently affects the stimulating light’s intensity and the photoionization cross-section of the electrons,which have been captured by the traps.展开更多
基金Project supported by the National Natural science Foundation of China.
文摘The phase diagram of BaB_2O_4-Na_2B_2O_4-K_2B_2O_4 ternary system has been studied by combination of experimental measurement with theoretical calculation.On the basis of selfconsistent thermodynamic analysis of three sub-binary phase diagrams,the optimized the- rmodynamic data of these sub-binary systems are extrapolated to ternary system by asymmet- rical Toop approach,and the BaB_2O_4-Na_2B_2O_4-K_2B_2O_4 ternary phase diagram is calculated. In comparison with a measured typical vertical section,the calculated ternary phase diagram is quite satisfactory.
文摘Hydrothermal treatment of calcium oxide and boric acid mixtures at temperaturesbetween 234 ℃ and 300 ℃ has produced a colorless, transparent, orthorhombic compound Ca2B6O11 · H2O. Of the seven known members of the series of hydrated dicalcium hexaborate containing boron-oxygen six-membered ring anionic group (B3O8)7, only the title compound has been found to have the nonlinear optical effect. The second harmanic generation (SHG) effect of its crystal is larger than that of KH2PO4 (KDP). The reflection spectrum has shown that this compound has no absorption in the experimental wavelength range (800-240 nm). Its crystal structure is favorable for generating the nonlinear optical effect.
文摘Polycrystal Li_(2)B_(4)O_(7)(LBO)doped with Cu and In was prepared and then sintered at different temperatures.X-ray diffraction(XRD)was applied to get the parameters of the LBO structure,thermoluminescence(TL)and optically stimulated luminescence(OSL)were measured,and a second-order exponential decay model was fitted to the OSL decay curves.The results indicate that the original number of OSL traps that have captured electrons is linearly related with the sum of TL decay during the OSL process.Mean decay constant of OSL is related to the sintered temperature.The possible reason is that the sintered temperature affects the crystal sizes of the polycrystal,and consequently affects the stimulating light’s intensity and the photoionization cross-section of the electrons,which have been captured by the traps.