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对焦硅酸钆-焦硅酸铈(Gd_2Si_2O7-Ce_2Si_2O7,GPS-CPS)体系的相关系和光学性能随组分的变化进行了研究,采用固相烧结法制备了系列(Gd1-xCex)_2Si_2O7(x=0%~100%)多晶样品,通过X射线衍射谱确定样品的结构,通过真空紫外激发发射谱、X射线激发发射谱和荧光衰减谱对样品的光学性能表征。结果表明:纯GPS固相合成的反应路径为Gd_2O3、SiO2→GSAP(磷灰石相)→GPS(高温正交相)。随着Ce浓度的增加,GPS:Ce多晶样品呈现正交→三斜→单斜的变化特点:Ce掺杂量在8.00%~10.00%范围时,样品为两相区,正交、三斜相共存。同时,GPS:0.50%Ce样品发光效率最高。GPS:Ce样品的发光过程存在Gd3+→Ce3+的能量传递,导致Ce3+发光中慢分量的出现,且随着Ce浓度的增加,传递效率逐渐降低。
Abstract：The solid-solution behavior and luminescence properties of gadolinium pyrosilicate-cerium pyrosilicate(Gd_2Si_2O7-Ce_2Si_2O7,GPS-CPS) system were investigated.A series of cerium doped gadolinium pyrosilicate powders(Gd1-xCex)_2Si_2O7(x=0%~100%) were obtained by a solid-state synthesis method.The structure of the samples obtained was determined by X-ray diffraction(XRD).The scintillation and optical properties of GPS:Ce compounds were characterized via vacuum ultraviolet excitation and emission spectra,X-ray excitation luminescence spectra and fluorescence decay curves.The reaction paths of pure GPS at different Ce3+ concentrations are Gd_2O3,SiO2→GSAP(apatite)→GPS(high-temperature orthorhombic).The structure of GPS-CPS system changes when Ce3+ concentration increases as the following order,i.e.,orthorhombic-triclinic-monoclinic.The two-phase(i.e.,orthorhombic and triclinic) region appears in Ce3+ concentration range from 8.00%to 10.00%.The radio-luminescence intensity of GPS:0.50%Ce is the maximum value in the Ce3+ concentration range of 0.05%-10.00%.The slow lifetime is attributed to the energy transfer from Gd3+to Ce3+ in GPS:Ce luminescence process.Meanwhile,the energy transfer rate decreases as the cerium doping concentration increases.
[1]KAWAMURA S,KANEKO J H,HIGUCHI M,et al.Floating zone growth and scintillation characteristics of cerium-doped gadolinium pyrosilicate single crystals[J].IEEE Trans Nucl Sci,2007,54(4):1383-1386.
[2]KAWAMURA S,KANEKO J H,HIGUCHI M,et al.Investigation of Ce-doped Gd_2Si_2O_7 as a scintillator materiat[J].Nucl Instrum Methods Phys Res Sect A,2007,583(2):356-359.
[3]TSUBOTA Y,KANEKO J H,HIGUCHi M,et al.High-temperature scintillation properties of orthorhombic Gd_2Si_2O_7 aiming at well logging[J].Appl Phys Exp,2015,8(6):062602(1-4).
[4]FENG H,DING D Z,LI H Y,et al.Cerium concentration and temperature dependence of the luminescence of Lu_2Si_2O_7:Ce scintillator[J].J Alloy Compd,2011,509(9):3855-3858.
[5]TOROPOV N A,GALAKHOV F Y,KONOVALOVA S F.Silicates of the rare earth elements[J].Bull Acad Sci USSR,Div Chem Sci,1961,10(4):497-501.
[6]KAWAMURA S,HIGUCHI M,KANEKO J H,et al.Phase Relations around the pyrosilicate phase in the Gd_2O_3-Ce_2O_3-SiO_2 system[J].Cryst Growth Des,2009,9(3):1470-1473..
[7]FELSCHE J.The Crystal Chemistry of the Rare-earth Silicates[M].Berlin Heidelberg:Springer,1973,13:99-197.
[8]KAWAMURA S,KANEKO I H,HIGUCHI M,et al.Scintillation characteristics of Ce:Gd_2Si_2O_7(Ce 2.5mol%-30 mol%)single crystals prepared by the floating zone method[J].IEEE Trans Nucl Sci,2009,56(1):328-330.
[9]SHINDE S,PITALE S,SINGH S G,et al.Structural and luminescence properties of Gd_2Si_2O_7:Ce prepared by solution combustion followed by heat treatment[J].J Alloy Compd,2015,630:68-73.
[10]MAIERA N,RIXECKERB G,NICKEL K G.Properties and crystallization of rare-earth Si-Al-O-N glasses containing mixed trivalent modifiers[J].J Am Ceram Soc,2005,88(4):875-881.
[11]MAIERA N,RIXECKERB G,NICKEL K G.Formation and stability of Gd,Y,Yb and Lu disilicates and their solid solutions[J].J Solids State Chem,2006,179(6):1630-1635.
[12]FENG H,XU W,REN G,et al.Optical,scintillation properties and defect study of Gd_2Si_2O_7:Ce single crystal grown by floating zone method[J].Phys B,2013,411:114-117.
[13]SUZUKI H,TOMBRELLO T A,MELCHER C L,et al.The role of gadolinium in the scintillation processes of cerium-doped gadolinium oxyorthosilicate[J].Nucl Instru Meth Phys A,1994,346(3):510-521.
基本信息:
DOI：10.14062/j.issn.0454-5648.2017.01.09
中图分类号:TQ422
引用信息:
[1]万欢欢,冯鹤,肖丰,等.Gd_2Si_2O_7-Ce_2Si_2O_7体系的相关系及其发光性能[J].硅酸盐学报,2017,45(01):64-69.DOI:10.14062/j.issn.0454-5648.2017.01.09.
基金信息:
国家自然科学基金青年基金(5140218);; 上海大学创新基金;; 上海市高校青年教师资助计划项目
2016-12-12
2016-12-12
2016-12-12