Deposition and Dispersion of Nanoparticles in Glasses and Slags for Photonic Materials

研究了YF_3和BeF_2对氟铍酸铝玻璃真空紫外透射光谱和折射率的影响。当BeF_2含量为20 mol %时，MgF_2-CaF_2-SrF_2-AlF_3玻璃的紫外吸收边波长最短（约为147 nm），透射率最高（2 mm样品厚度时为60%）。利用扩展X射线吸收精细结构（EXAFS）方法对氧化物玻璃中Er^<3+>和Yb^<3+>的局域结构进行了研究，并对Er ^<3 +>和Yb^<3+>的局域结构进行了分析。我们将稀土离子在氧化物玻璃中的局域结构分为两种类型：前者为间隙型，后者为替代型。Er^<3 +>：I_<13/2> →^4I_<15/2>和Yb^<3+>的自发辐射几率之间的关系 ...更多信息 从这两种类型讨论了氧化物玻璃中的^2F_<5/2> →^2F_<7/2>跃迁及其局域结构，并研究了氧化物玻璃的力学和热学性质。为了预测玻璃的杨氏模量，得到了经验组成参数G_i和V_i，其中G_i为单组分氧化物的离解能，V_i为堆积密度参数。考虑到磷酸盐和碲酸盐玻璃的网络结构，对G_i进行了修正。结果表明，使用我们提出的参数的计算值与测量值在整个氧化物玻璃是很好的协议。根据德拜模型讨论了热容与化学组成的关系。我们发现，这里研究的所有样品的热容与德拜温度下的摩尔热容的比例具有类似的幅度和温度依赖性。在此基础上，我们提出了一个经验方程，该方程由组分和温度对热容的独立贡献组成。采用熔融淬火和后热处理方法制备了含金属铜纳米颗粒的磷酸盐玻璃。根据金属铜纳米粒子在磷酸盐玻璃中的分散性和粒径分布，绘制了金属铜纳米粒子分散玻璃的时间-温度-沉积（TTD）图。在低于玻璃化转变温度下，在50 BaO-50P_2O_5+6Cu_2O+6SnO+2Sb_2O_3（mol %）玻璃样品中沉积了大量单分散的金属铜纳米颗粒，其粒径分布较窄。为了控制金属铜纳米颗粒在玻璃中的尺寸、尺寸分布、浓度和分散性，我们从Cu^+离子与还原性氧化物SnO和Sb_2O_3之间的氧化还原反应以及Cu^+、Sn^<2+>和Sb^<3+>离子的分布方面讨论了它们的沉积和生长机理。少

The influence of YF_3 and BeF_2 on vacuum ultraviolet (VUV) transmission spectra and refractive indexes of aluminum fluoroberyllate glasses was investigated. The MgF_2-CaF_2-SrF_2-AlF_3 containing 20 mol % BeF_2 glass composition exhibited the shortest wavelength of UV absorption edge (〜147 nm), and the highest transmittance at 157 nm (60 % for 2 mm sample thickness). In order to predict for the refractive indexes of fluoride glasses, we presented compositional parameter of fluoride based on our measured data.Extended X-ray absorption fine structure (EXAFS) measurements have been performed on Er^<3+> and Yb^<3+> in oxide glasses in order to investigate the local structure surrounding Er^<3+> and Yb^<3+>. We classified the local structures surrounding rare earth ions in oxide glasses into two types : the former and the latter are interstitial and substitutive types, respectively. The relationship between the spontaneous emission probability for Er^<+3> : I_<13/2> →^4I_<15/2> and Yb^<3+> … More : ^2F_<5/2> →^2F_<7/2> transitions and their local structures in oxide glasses is discussed in terms of these two types.The mechanical and thermal properties of oxide glasses were investigated. To predict the Young's moduli of the oxide glasses, empirical compositional parameters G_i and V_i were obtained, where G_i is the dissociation energy and V_i the packing density parameters of single-component oxide. Taking the network structures of phosphate and tellurite glasses into account, the G_i were modified. The results revealed that the calculated values using our proposed parameter were in good agreement with measured values all through the oxide glasses. The relationship between heat capacity and chemical composition was discussed in terms of the Debye model. We found that heat capacities of all the samples studied here scaled with the molar heat capacity at the Debye temperature have a similar magnitude and temperature dependence. Based on this observation, we propose an empirical equation which is composed of separate contributions of the compositional and temperature dependence of the heat capacity.Phosphate glasses containing metallic copper nanoparticles were prepared by melt-quenching and post heat treatment method. The time-temperature-deposition (TTD) diagram for the glass dispersed with metallic copper nanoparticles was constructed based on the particle size and dispersion of metallic copper nanoparticles in phosphate glasses. A large amount of mono-dispersed metallic copper nanoparticles with a narrow size-distribution deposited in the 50BaO-50P_2O_5+6Cu_2O+6SnO+2Sb_2O_3 (mol %) glass samples heated below the glass transition temperature. In order to control the size, size-distribution, concentration, and dispersion of metallic copper nanoparticles in the glass, we discussed their deposition and growth mechanisms in terms of the redox reactions between Cu^+ ions and reducing oxides, i.e. SnO and Sb_2O_3, and the distribution of Cu^+, Sn^<2+>, and Sb^<3+> ions. Less