以高纯a-Al_2O_3粉与AlN粉为原料,采用无压烧结,通过气氛渗透,在烧制过程中掺入等量碳的方法制备AlON:C透明陶瓷,研究AlON:C透明陶瓷的光释光性能。结果发现:AlON:C透明陶瓷光释光衰变曲线都随着时间呈指数变化衰减,前期衰减快,后期衰...以高纯a-Al_2O_3粉与AlN粉为原料,采用无压烧结,通过气氛渗透,在烧制过程中掺入等量碳的方法制备AlON:C透明陶瓷,研究AlON:C透明陶瓷的光释光性能。结果发现:AlON:C透明陶瓷光释光衰变曲线都随着时间呈指数变化衰减,前期衰减快,后期衰减速率变慢;470 nm蓝光不能清空光释光信号,光释光有信号堆积现象。β射线辐照下,AlON:C陶瓷的光释光剂量响应曲线呈线性、亚线性,并有趋向饱和的特点;AlON:C透明陶瓷对b射线的光释光响应曲线在50 m Gy^50 Gy与50~100 Gy吸收剂量范围内呈非常良好的线性关系;在50~500 m Gy吸收剂量范围内,β与γ射线光释光响应线性良好,γ射线辐照下的光释光强度约为β射线辐照下的光释光强度的76%。展开更多
Novel nanometer-sized ScAlMgO4:Eu3+ phosphors were successfully synthesized by the citric acid complexation method.The mean particle size of the obtained powders was within the range of 100～150 nm according to the SE...Novel nanometer-sized ScAlMgO4:Eu3+ phosphors were successfully synthesized by the citric acid complexation method.The mean particle size of the obtained powders was within the range of 100～150 nm according to the SEM patterns.In ScAlMgO4:Eu3+ showed strong characteristic red emission,of which the maximum emission peak was located at 629 nm for ultraviolet(UV) excitation.The dependence of photoluminescence intensity on Eu3+ concentration was also studied in detail,and the emission intensity of Sc1-xEuxAlMgO4 was about 10% at optimized Eu3+ concentration.Furthermore,the luminescence decay measurements showed that the lifetimes of Eu3+ were in the range of millisecond.The obtained ScAlMgO4:Eu3+ phosphors with nanometer size and excellent luminescence efficiency would be potential red phosphors in plasma display panels.展开更多
Crystals of scandium magnesium aluminate,ScAlMgO4,were grown from the melt prepared from stoichiometric quantities of Sc2O3,Al2O3 and MgO. Single-crystal X-ray diffraction indicates that ScAlMgO4 crystallizes in the s...Crystals of scandium magnesium aluminate,ScAlMgO4,were grown from the melt prepared from stoichiometric quantities of Sc2O3,Al2O3 and MgO. Single-crystal X-ray diffraction indicates that ScAlMgO4 crystallizes in the space group R3 m with a = b = 3.2506(9) ,c = 25.152(8) ,V = 230.16(11) 3,Z = 3,F(000) = 234,μ = 2.424 cm-1,the final R = 0.0381 and wR = 0.1061 for 1874 observed reflections with Ⅰ > 2σ(Ⅰ). In ScAlMgO4,all Sc atoms are coordinated octahedrally,whereas Al or Mg atoms are forming a tetrahedron,or in a triangular bipyramid if one distant O atom is included. The structure of ScAlMgO4 is characterized by {[AlMgO4]3-} ∞2 layers parallel to the ab plane,and they are further connected into a 3-dimen-sional framework by Sc atoms via O(1) atoms between the layers.展开更多
文摘以高纯a-Al_2O_3粉与AlN粉为原料,采用无压烧结,通过气氛渗透,在烧制过程中掺入等量碳的方法制备AlON:C透明陶瓷,研究AlON:C透明陶瓷的光释光性能。结果发现:AlON:C透明陶瓷光释光衰变曲线都随着时间呈指数变化衰减,前期衰减快,后期衰减速率变慢;470 nm蓝光不能清空光释光信号,光释光有信号堆积现象。β射线辐照下,AlON:C陶瓷的光释光剂量响应曲线呈线性、亚线性,并有趋向饱和的特点;AlON:C透明陶瓷对b射线的光释光响应曲线在50 m Gy^50 Gy与50~100 Gy吸收剂量范围内呈非常良好的线性关系;在50~500 m Gy吸收剂量范围内,β与γ射线光释光响应线性良好,γ射线辐照下的光释光强度约为β射线辐照下的光释光强度的76%。
基金supported by the Natual Science Foundation of Fujian Province (2006H0041)
文摘Novel nanometer-sized ScAlMgO4:Eu3+ phosphors were successfully synthesized by the citric acid complexation method.The mean particle size of the obtained powders was within the range of 100～150 nm according to the SEM patterns.In ScAlMgO4:Eu3+ showed strong characteristic red emission,of which the maximum emission peak was located at 629 nm for ultraviolet(UV) excitation.The dependence of photoluminescence intensity on Eu3+ concentration was also studied in detail,and the emission intensity of Sc1-xEuxAlMgO4 was about 10% at optimized Eu3+ concentration.Furthermore,the luminescence decay measurements showed that the lifetimes of Eu3+ were in the range of millisecond.The obtained ScAlMgO4:Eu3+ phosphors with nanometer size and excellent luminescence efficiency would be potential red phosphors in plasma display panels.
基金supported by the Natual Science Foundation of Fujian Province (2006H0041)
文摘Crystals of scandium magnesium aluminate,ScAlMgO4,were grown from the melt prepared from stoichiometric quantities of Sc2O3,Al2O3 and MgO. Single-crystal X-ray diffraction indicates that ScAlMgO4 crystallizes in the space group R3 m with a = b = 3.2506(9) ,c = 25.152(8) ,V = 230.16(11) 3,Z = 3,F(000) = 234,μ = 2.424 cm-1,the final R = 0.0381 and wR = 0.1061 for 1874 observed reflections with Ⅰ > 2σ(Ⅰ). In ScAlMgO4,all Sc atoms are coordinated octahedrally,whereas Al or Mg atoms are forming a tetrahedron,or in a triangular bipyramid if one distant O atom is included. The structure of ScAlMgO4 is characterized by {[AlMgO4]3-} ∞2 layers parallel to the ab plane,and they are further connected into a 3-dimen-sional framework by Sc atoms via O(1) atoms between the layers.
