Investigation of GeSe2-In2Se3-AgI Chalcogenide Glasses

采用传统熔融-淬冷法制备了一系列新型(100-x)(4GeSe2-In2Se3)-xAgI(x=20,30,40 mol％)硫系玻璃样品.利用X射线衍射分析、差热分析、可见-近红外吸收光谱、红外透过光谱、喇曼分析等技术手段研究了该玻璃系统的组成、结构、热稳定性和光学特性等.利用Tauc方程计算出了样品的间接带隙;测试了部分样品在不同升温速率下的差示扫描量热曲线,并采用Kissinger法计算了玻璃样品的析晶活化能.X射线衍射数据表明,该玻璃体系在较宽的组分范围内有良好的非晶特性,成玻范围较宽;差热分析和析晶动力学研究表明,玻璃样品70(4GeSe2 -In2Se3) -30 AgI具有较好的热稳定性(△T-114℃)和较高的活化能(Ea=320.4 kJ/mol).随着AgI含量的增加,玻璃的短波吸收限蓝移,并且光学带隙有增大的趋势.此外,红外透过光谱分析表明该玻璃体系具有良好的红外透过性能,其红外截止波长不会随着AgI含量的增加而发生明显变化,皆为16μm左右.     

新型GeSe2-In2Se3-AgI玻璃性能研究

采用传统熔融-淬冷法制备了一系列新型(100-x) (4GeSe₂-In₂Se₃) -xAgI(x=20,30,40 mol%)硫系玻璃样品.利用X射线衍射分析、差热分析、可见-近红外吸收光谱、红外透过光谱、喇曼分析等技术手段研究了该玻璃系统的组成、结构、热稳定性和光学特性等.利用Tauc方程计算出了样品的间接带隙;测试了部分样品在不同升温速率下的差示扫描量热曲线,并采用Kissinger法计算了玻璃样品的析晶活化能.X射线衍射数据表明,该玻璃体系在较宽的组分范围内有良好的非晶特性,成玻范围较宽;差热分析和析晶动力学研究表明,玻璃样品70(4GeSe₂-In₂Se₃)-30AgI具有较好的热稳定性(ΔT=114℃)和较高的活化能(E_a=320.4 kJ/mol).随着AgI含量的增加,玻璃的短波吸收限蓝移,并且光学带隙有增大的趋势.此外,红外透过光谱分析表明该玻璃体系具有良好的红外透过性能,其红外截止波长不会随着AgI含量的增加而发生明显变化,皆为16μm左右.     

PbI2对远红外Te基硫系玻璃光学性能的影响

用传统的熔融淬冷法制备了一系列新型Ge-Te-PbI₂硫系玻璃,并且讨论了玻璃的形成区域. 利用X射线衍射(XRD)、差热分析(DTA)、可见/近红外吸收光谱、红外透过光谱等技术,研究重金属卤化物PbI₂对Ge-Te硫系玻璃组成、结构和性能的影响. 利用Tauc方程计算了样品的直接和间接光学带隙,根据金属标准和能量带隙理论讨论了玻璃光学带隙与组分变化的关系. 结果表明:PbI₂的引入,提高了Te玻璃的形成能力,而且玻璃的热稳定性良好;随着PbI₂含量的增加,玻璃的密度和折射率均增大,光学带隙减小,短波吸收截止边发生红移,玻璃的红外截止波长基本不变,达到了25 μm. 该系列玻璃可用于制备远红外长波波导器件. 关键词： Te基玻璃 2')" href="#">PbI₂ 光学带隙 红外光谱     

远红外Ge-Te-AgI硫卤玻璃光学性能

用传统熔融淬冷法制备了一系列(100－x)(GeTe4.3)－xAgI (x=5,10,20,30)硫卤玻璃.并通过阿基米德法、XRD衍射、差热分析、可见/近红外吸收光谱、红外透射光谱等手段研究了该硫卤玻璃的热稳定性和光学特性.研究表明随着AgI含量的增加,玻璃的密度从5.591 g·cm－3递增到6.314 g·cm－3|折射率从3.73上升到5.70|XRD衍射数据表明该玻璃体系在较宽的组分范围内没有微晶析出,说明成玻范围较宽|差热分析表明当x=5时玻璃有着最高的转变温度206 ℃|AgI含量增多时短波截止限发生红移,红外截止波长基本不变（均超过25 μm）,表明此硫卤玻璃材料在远红外领域有很大的潜在应用前景.     

Se改良的远红外Te基硫系玻璃

将成玻性良好的Se逐步掺入到远红外Ge-As-Te玻璃中,观察其物理、光学特性的渐变过程.采用传统熔融淬冷法制备Ge_(10)As_(40)Te_(50-x)Se_x(x=0,10,20,30,40,50)系列玻璃,用X射线衍射仪、Raman光谱仪、热膨胀仪测试玻璃的内部微观结构和物化性质;用傅里叶红外光谱仪、分光光度计测试玻璃的可见/近红外与红外透射光谱等频谱性质;利用经典Tauc方程估算玻璃样品的直接和间接带隙.测试结果表明:Se含量的增加能有效提高玻璃的热稳定性,最高玻璃转化温度可达到233℃;可见/近红外短波截止边发生蓝移,光学带隙增大,透过范围广且透过性良好,红外透过率最高可达到56%,红外截止边仍然保持在20μm,当Se含量配比在低于2 mol的情况下,其热稳定性改善明显但光谱变化最小.最后,讨论了一种加还原剂Mg对该类玻璃进行提纯的方案,实验表明提纯后玻璃的透过谱线均匀平滑且无明显杂质峰.     

远红外Ge-Ga-Te-Ag硫系玻璃性能研究（英文）

采用传统的熔融-淬冷法制备了一系列的(Ge_(15)Ga_(10)Te_(75))_(100-x)(Ag)_x硫系玻璃样品.通过X射线衍射、差式扫描量热法、傅里叶红外光谱仪等测试了玻璃样品的热学及光学性能.结果表明该玻璃具有良好的非晶态特性和热稳定性,玻璃开始析晶温度和玻璃转变温度的差值都超过了100℃.随着Ag含量的增加,玻璃的吸收截止边产生了红移.通过提纯,Ge-Ga-Te-Ag玻璃在1.8~20μm有着较宽且平坦的红外光学窗口.Ge-Ga-Te-Ag玻璃组分的优良性质使其在红外领域具有广阔的应用前景.     

新型远红外Ge-Ga-Te-KBr硫系玻璃性能研究

用传统的熔融淬冷法制备了远红外Te基硫系玻璃(Ge15Ga10Te75)100-x(KBr)x(x=2、4、6、8mol%).利用X射线衍射仪、差示扫描量热仪等设备测试玻璃的结构和物化性质,分析了引入KBr对Te玻璃的结构、化学和物理热稳定性等方面的影响;利用分光光度计、红外光谱仪等光学方法研究了该类Te玻璃的光谱性质,分析了KBr对该类玻璃的短波吸收和红外透过光谱的影响;利用Tauc方程估算了玻璃样品直接和间接的光学带隙.实验结果表明:随着KBr含量的增加,玻璃的短波截止边发生红移,而红外截止边基本没有发生变化,该组玻璃始终保持较宽的红外透过范围.     

氟锆酸盐光纤玻璃中的析晶和分相现象

氟化物光纤玻璃中的夹杂物,分相颗粒和微晶颗粒等缺陷,造成光纤的散射损失,影响了实际制备工作.本文利用大视场光学显微镜,X射线衍射,透射电子显微镜和差热分析,研究了ZBLA氟化物玻璃中的分相和析晶现象,观察到了以成核生长机理进行的分相颗粒,析晶颗粒的成分是β-BaF_2·ZrF_4和α-BaF_2·2ZrF_4,通过DTA分析确定了这些相的析晶活化能.     

TeO2-Nb2O5-BaCl2玻璃的结构及光学性能研究

用传统熔融法制备了一种新型的氧氯碲酸盐玻璃:（90-x）TeO₂-10Nb₂O₅-xBaCl₂（x=10,20,30）,用密度比重天平、显微拉曼光谱仪、红外-可见-紫外分光光度计和棱镜耦合仪研究了组分变化对玻璃密度、结构、光学性质、折射率和色散的影响.研究结果表明:随玻璃中BaCl₂含量增加,玻璃密度出现了先增大后减小的现象;玻璃结构中双三角锥体[TeO₄]量减少,三角棱锥体[TeO₃]量增加;玻璃的折射率逐渐减小.新型的氧氯碲酸盐玻璃具有较高的线性折射率n_max=2.02259,非线性折射率N₂=6.8×10^-12esu与三阶非线性极化率χ^（3）=3.7×10^-13esu.制备的新型碲酸盐玻璃在可见和中红外光谱区具有高透过,在近紫外光谱区具有明显的吸收截止波长,且随BaCl₂含量增加吸收截止波长发生了明显的蓝移现象.利用经典的Tauc方程计算了玻璃样品的直接跃迁光学带隙和间接跃迁光学带隙,玻璃的光学带隙随BaCl₂含量增加而增大.     

新型远红外Ge-Te-I硫系玻璃性能研究

采用传统的熔融-淬冷法制备了系列Ge20Te80－xIx(x=2,4,6,8 mol%) 玻璃样品.利用X射线衍射仪、扫描电子显微镜、差热分析仪等设备系统测试了玻璃结构和物化性质,分析了卤素I对玻璃形成及稳定性的影响|利用分光光度计、红外光谱仪等研究了玻璃光谱性质,分析了I对玻璃的短波吸收及红外透过光谱的影响|利用Tauc方程计算了样品的直接和间接光学带隙.实验结果表明:I的引入,降低了Te的金属性,提高了Te基硫系玻璃的成玻能力|随着卤素I含量的增加,玻璃的密度减小,摩尔体积增大,且短波吸收截止边发生红移,光学带隙减小|I的引入提高了玻璃的热稳定性,其中玻璃组分为Ge20Te72I8样品热稳定性最好,其特征温度（ΔT）达到121℃|各Ge-Te-I玻璃样品均具有良好的红外透过性能,其红外透过范围为1.8~25 μm.     

GeS2-In2S3硫系玻璃的物化性质与晶化行为研究

认识玻璃组成-性能-结构之间关系是玻璃科学中经久不衰的研究课题之一. 在制得(100-x) GeS₂-xIn₂S₃ (x=10, 15, 20, 25或30 mol%) 系列玻璃和玻璃陶瓷样品的基础上, 利用可见-近红外透过光谱, DSC, XRD和Raman光谱等测试技术表征了随组份变化的光学带隙, 玻璃转变温度以及晶化行为等, 并结合GeS₂-Ga₂S₃玻璃研究结果探讨了Ga, In 元素及其形成的网络结构对玻璃性质的影响.研究发现, 在硫系玻璃中In比Ga对光学带隙和玻璃转变温度等性质的影响要大. 它们所形成玻璃的晶化行为也截然不同, 但与其各自的材料相图有着密切的联系. 利用偏振拉曼光谱获得玻璃网络中的基本结构单元信息.最后, 结合材料相图, 玻璃随组成变化的物化性质和晶化行为以及基本网络结构单元的认识, 探讨了玻璃的化学拓扑与网络拓扑之间的联系, 为今后研究提供一种新的研究思路.     

Optical absorption spectrum of Cu2O-CaO-P2O5 glasses

Homogeneous CaO-P₂O₅ and Cu₂O-CaO-P₂O₅ glasses were prepared using a melt-quenched method under controlled conditions. The binary glasses were found to be colourless and transparent while the ternary glasses changed from light green to dark green as the Cu₂O content increased. From the absorption edge studies, the values of the optical band gap, E_opt and Urbach energy, ΔE were evaluated. The position of the absorption edge and hence the optical band gap were found to depend on the glass composition. Analysis of the optical band gap shows that for the binary glasses, the value increases as the content of CaO decreases, while for the ternary glasses, the value of the optical band gap increases as the content of the Cu₂O decreases. The density of the glasses was also measured and was found to increase with the increase in CaO and Cu₂O contents.     

具有高机械强度的掺Er3+∶TeO2-Nb2O5玻璃的光谱性质研究

熔制了掺铒碲铌玻璃样品(100-XTeO2-XNb2O5(X=5,10,15,20 mol%),测试了其密度、折射率、转变温度、析晶温度、维氏机械强度、吸收光谱、荧光光谱、荧光寿命等参量。利用Judd-Ofelt和McCumber理论分别计算了铒离子强度参量Ωt (t=2, 4, 6)和受激发射截面σemi的大小,研究了掺铒碲铌玻璃样品光谱参量对Nb2O5成分的依赖性,并与典型的碲锌钠玻璃（75TeO2-20ZnO-5Na2O）在热学、机械强度、光谱性质和放大品行四个方面进行了比较.     

Optical properties of Sm-doped CaF2 bismuth borate glasses

Sm³⁺-doped calcium fluoride bismuth borate glasses were prepared and characterized optically and the oscillator strengths and Judd–Ofelt parameters for the glass containing 1.5 mol% of Sm₂O₃ were calculated. Density and optical absorption, transmission and the emission spectra were measured. The values of Judd–Ofelt parameters suggested an increase in the degree of asymmetry the local ligand field at Sm³⁺ sites. The optical band gap energy, band tailing parameter and Urbach's energy were calculated for all glass samples. It was found that with increasing the concentration of Sm₂O₃ content the values of the optical band gap energy decrease whereas Urbach's energy increases. Absorption and excitation spectra indicate that commercial UV and blue laser diodes, blue and bluish-green LEDs and Ar⁺ optical laser are powerful excitation sources for Sm³⁺ visible fluorescence in the glass.     

Effect of Bi2O3 content on physical and optical properties of 15Li2O-15K2O-xBi2O3-(65−x) B2O3: 5V2O5 glass system

Multi-component bismuth borate glasses doped with vanadium ions 15Li₂O-15K₂O-xBi₂O₃-(65−x) B₂O₃: 5V₂O_5, (x=3, 5, 7, 10, 12 and 15) have been prepared using conventional melt quench technique. Characterization of the prepared glasses has been done using X-ray diffraction, differential scanning calorimetry and density measurements. The effect of Bi₂O₃ content on the optical properties of the present glass system is studied from the optical absorption spectra recorded in the wavelength range 200-800 nm. The fundamental absorption edge has been identified from the optical absorption spectra. The values of optical band gap for indirect allowed transitions have been determined using available theories. The origin of the Urbach energy is associated with the phonon-assisted indirect transitions. The density and molar volume studies indicate that Bi₂O₃ in these glasses is acting partly as network modifier and partly as network former. The variations in the optical band gap energies, density and molar volume with Bi₂O₃ content have been discussed in terms of changes in the glass structure. Values of the theoretical optical basicity, average crosslink density and the average electronic polarizability are also reported.     

Effect of neutron-irradiation on optical properties of SiO2-Na2O-MgO-Al2O3 glasses

Silica based glasses are used as nuclear shielding materials. The effect of radiation on these glasses varies as per the constituents used in these glasses. Glasses of different composition of SiO₂-Na₂OMgO-Al₂O₃ were made by melt casting techniques. These glasses were irradiated with neutrons of different fluences. Optical absorption measurements of neutron-irradiated silica based glasses were performed at room temperature (RT) to detect and characterize the induced radiation damage in these materials. The absorption band found for neutron-irradiated glasses are induced by hole type color centers related to non-bridging oxygen ions (NBO) located in different surroundings of glass matrix. Decrease in the transmittance indicates the formation of color-center defects. Values for band gap energy and the width of the energy tail above the mobility gap have been measured before and after irradiation. The band gap energy has been found to decrease with increasing fluence while the Urbach energy shows an increase. The effects of the composition of the glasses on these parameters have been discussed in detail in this paper.      

Optical and acoustic properties of TeO2/WO3 glasses with small amount of additive ZrO2

The optical and acoustic properties of tellurite glasses in the system TeO₂/ZrO₂/WO₃ have been investigated. The refractive index at different wavelengths and the optical spectra of the glasses have been measured. From the refractive index and absorption edge studies for prepared glasses, the optical parameter viz; optical band gap (E_opt), Urbach energy, (ΔE), dispersion energy, E_d, and the average oscillator energy, E₀, have been calculated. Sound velocities were measured by pulse echo technique. From these velocities and densities values, various elastic moduli were calculated. The variations in the refractive index, optical energy gap and elastic moduli with WO₃ content have been discussed in terms of the glass structure. Quantitatively, we used the bond compression model for analyzing the room temperature elastic moduli data. By calculating the number of bonds per unit volume, the average stretching force constant, and the average ring size we can extract valuable information about the structure of the present glasses.