Bi2O3-B2O3-ZnO系玻璃着色的光谱吸收特性研究

以Bi2 O3-B2 O3-ZnO为基础玻璃,分别采用不同金属氧化物对其着色,研究着色剂种类、着色剂引入量以及玻璃粉粒径对玻璃粉热辐射吸收光谱性能的影响.结果表明:Co2 O3在600～690 nm和大于1120 nm波长范围的玻璃粉具有最高的吸收率;CuO和MnO分别在690～1120 nm和480～590 nm区间的吸收率高于其它着色剂,对氧化钴该波长的低吸收率具有互补性;采用复合着色剂玻璃的光谱吸收率不具有质量加和特性;玻璃粉的光谱吸收率随玻璃粉粒径的增大而明显增大.研究旨在为热辐射加热封接工艺封接玻璃的开发提供依据.     

Bi2O3-B2O3-SiO2玻璃的热性质

研究了Bi2O3-B2O3-SiO2系玻璃的成玻性能、转变温度(Tg)和热膨胀系数(CTE)，确定了该系统易熔封接玻璃的玻化范围以及玻璃的转变温度和玻璃的热膨胀系数与玻璃组成的关系。     

Bi2O3–B2O3二元系统玻璃的网络结构形成与光学性能研究

采用高温熔融–退火法制备了一系列Bi2O3–B2O3二元系统玻璃,系统研究了不同Bi/B摩尔比下B2O3和Bi2O3在玻璃网络结构中的竞争机制,重点探讨了组成对铋酸盐玻璃光学和结构性能的影响。通过吸收光谱和Raman光谱分析了Bi2O3–B2O3二元系统玻璃的网络形成机理,测试了玻璃的密度和线性折射率。结果表明:Bi3+和B3+均为玻璃网络形成体,Raman光谱以600cm–1为中心,其附近的Raman信号强度发生的有规律性变化:低能量区的Raman峰与玻璃中引入的铋离子有关,而高能区的Raman峰与玻璃中的硼氧结构体有关。     

P2O5对Bi2O3-B2O3-ZnO体系玻璃结构及热性能的影响

采用传统的熔融冷却的方法制备了(40-x)Bi2O3-30B2O3-30ZnO-xP2O5(0≤x≤15mo1％)体系玻璃.使用红外光谱、拉曼光谱、DSC和热膨胀仪研究了封接玻璃的结构和热性能.红外光谱及拉曼光谱结果表明,P2O5作为网络形成体,以[PO4]进入到玻璃的网络结构中,玻璃的网络结构性增强.玻璃结构中[BO3]三角体结构单元相对含量有增多趋势,[BO4]四面体、[BiO3]三角体、[BiO6]八面体结构单元相对含量减少.随着P2 O5含量的增加,玻璃化转变温度和玻璃的初始析晶温度升高;玻璃的密度减小.Bi2O3-B2O3-ZnO-P2O5体系封接玻璃热膨胀系数减小,从8.289×10-6℃-1减小到6.354×10-6℃-1.玻璃的软化点逐渐增大,从416℃升高到524℃.     

含Y2O3的ZnO-Bi2O3-B2O3系统玻璃热学与电学性能研究

用红外光谱仪、拉曼光谱仪和差热分析仪研究了用“熔化-急冷”制得的用于SOFC封装的含Y2O3的ZnO-Bi2O3-B2O3系统玻璃的结构和转变温度(Tg);用X射线衍射仪、热膨胀系数仪和高阻计研究了由“模压成型-热处理”制得的该玻璃制品的微晶化、热膨胀系数(α)和体积电阻率(p)情况.结果表明:Y2O3≤0.5～1.0wt.％时,Y2O3能促进[BO3]向[BO4]转变,使α降低;Y2O3≥0.5～1.0wt.％时,玻璃中Bi-O键增多,又使α降低趋势趋缓;随Y2O3增加,其作用可能由破坏网络结构逐渐向增强网络结构转变,致T8先降后升;添加Y2O3延缓了玻璃的析晶;微晶化能提高α和ρ;添加Y2O3虽致α和ρ下降,但其值仍在SOFC封接玻璃的要求范围内.     

Bi_2O_3–ZnO–B_2O_3三元系统玻璃结构与性能

采用X射线吸收精细结构和红外吸收光谱分别对铋锌硼玻璃中铋离子邻近结构和硼氧网络结构进行研究,分析其结构变化对玻璃转变温度Tg和热膨胀系数α的影响。结果表明:1)铋离子以三配位([BiO3])和六配位([BiO6])两种配位状态存在;随Bi2O3含量增加,三配位铋离子的配位数上升,六配位铋离子配位数下降,同时铋离子总配位数上升。2)随Bi2O3含量增加,硼氧网络中硼氧四面体含量下降,硼氧三角体含量上升,硼氧四面体网络解聚形成硼氧三角体网络。3)上述结构因素是造成玻璃转变温度Tg下降和热膨胀系数α上升的主要原因。     

Bi2O3-B2O3-Ga2O3玻璃的光学折射率和带隙研究

采用传统熔融淬冷法制备了5组高Bi2O3含量的Bi2O3-B2O3-Ga2O3系统玻璃样品.测试了玻璃样品的密度,折射率和吸收光谱.利用经典的Tauc方程计算了样品的间接允许光学带隙Eopgi,直接允许光学带隙Eopgd和Urbach能量ΔE.根据Duffy等人提出的经验推导公式计算了样品的能量带隙Eg.研究了Ga2O3含量对玻璃样品的密度、折射率、摩尔折射度Rm、金属标准值Mm、光学带隙、能量带隙和Urbach能量的影响,并分析了它们之间的关系.结果表明:随着Ga2O3含量的增加,玻璃样品的密度和折射率逐渐增大,但Ga3+对玻璃折射率的影响要小于B3+;玻璃样品的紫外吸收增强,光学带隙和能量带隙逐渐减小,光学带隙和能量带隙的比值约为1:1.1;Urbach能量逐渐减小,即玻璃中带裂变和缺陷形成的趋势越小.     

Bi_2O_3-B_2O_3-BaO玻璃的结构与热学性能研究

通过调整ω(Bi_2O_3)/ω(BaO)比例关系,研究了Bi_2O_3-B_2O_3-BaO低熔点玻璃体系结构和性能,通过DTA测定了玻璃软化温度和转变温度,热膨胀测试仪测试玻璃膨胀系数,红外光谱仪和X射线衍射仪分别研究玻璃结构和玻璃化程度。结果表明:玻璃的软化温度和转变温度都随着BaO质量分数的增加而增加,两者均处于较低的温度变化区间;玻璃的热膨胀系数随着BaO质量分数的增加而升高,XRD表明,玻璃的玻璃化程度良好,没有析晶。     

Bi2O3-B2O3-BaO系玻璃的光学折射率与带隙

研究了Bi2O3-B2O3-BaO三元系统的玻璃形成区,给出了该三元系统玻璃形成范围.采用熔融淬冷法制备了60Bi2O3-(40-x)B2O3-xBaO(x=5,10,15,20)和65Bi2O3-25B2O3-10BaO(以摩尔计)的5组高Bi2O3含量的Bi2O3-B2O3-BaO玻璃样品.测试了玻璃样品的折射率和吸收光谱,根据经典的Tauc方程计算了间接允许光学带隙和直接允许光学带隙,计算了样品的能量带隙,并估算了它们之间的关系.研究结果表明;随着BaO含量的增加,玻璃样品折射率逐渐增大,但Ba2 对玻璃折射率的影响要远小于Bi3 ;玻璃样品的紫外吸收增强,光学带隙和能量带隙逐渐减小,光学带隙和能量带隙的比值约为1:1.2.     

硅酸铋体系玻璃的制备和发光性能研究

采用高温熔融法成功制备了组分为x Bi2O3-(100-x)Si O2(x=30~60 mol%)的Bi2O3-Si O2体系透明玻璃,并利用X射线衍射、拉曼光谱(Raman Spectra)、近红外发射光谱和紫外-可见光-近红外透射谱分析了该玻璃体系的网络结构发光特性。系统研究了该玻璃体系的铋硅比、不同熔制温度对其光学特性的影响。     

Dielectric Properties of Glasses in the Systems Bi2O3-CdO-SiO2, Bi2O3-CdO-B2O3, and Bi2O3-CdO-GeO2 and Their Relation to the Structure of Glass

Areas of glass formation and regions of “neo-ceramic” glasses in the systems Biz03-CdO-Si02, Bi203-Cd0-B203, and Bi203-Cd0-GeO2 are demarcated. Properties of glasses in the neoceramic regions were determined before and after nucleation and heat treatment. There are no maxima or minima in the dielectric properties versus composition curves. The dielectric constants increase after nucleation and heat treatment. The dissipation factors show a remarkable change toward higher values. Transparent glasses with Bi₂O₃. CdO as the predominant constituents have unusual dielectric constants ranging from 30 to 42 and dissipation factors ranging from 3 to 50 × 10⁻⁴., Since these glasses contain only from 0.5 to 2.0 wt% SiO₂ or B₂O₃ or 5 wt% GeO₂, the conventional concept of glass structure composed of a random spacial network of SiO₄ tetrahedra, whose interstices are filled with network modifiers, cannot be sustained in this case. It is suggested that the dominant cations Bi^{3 +} and Cd²⁺ form the network and that the interstices are occupied by Si4 + cations. The function of the Si⁴⁺ ion apparently is to distort the highly polarizable Bi3 + ion enough to form a random network. It appears to be possible that Bi³⁺ and Cd²⁺ can form the network in sixfold coordination. The dielectric losses observed are explained in terms of the relative instability of the structure.     

ZnO对Bi2 O3-B2 O3-ZnO低熔点玻璃结构与性能的影响

通过FTIR、Raman、27 Al NMR、XRD、DSC等测试方法,研究了ZnO含量对Bi2 O3-B2 O3-ZnO-SiO2-Al2 O3系统低熔点玻璃结构及热性能的影响.结果表明:当ZnO含量小于12wt％时,Zn2+与自由氧结合形成[ZnO4]四面体,增强网络结构,玻璃化转变温度增大,热膨胀系数减小;当ZnO含量大于12wt％时,锌氧多面体由四配位[ZnO4]转变为六配位[ZnO6],破坏网络结构,玻璃化转变温度减小,热膨胀系数增大;ZnO含量的提高和热处理温度的升高对玻璃析晶能力没有明显的促进作用.     

Tailoring the efficient laser-absorption-melting behavior of Bi2O3-B2O3-ZnO-Nd2O3 glass for the OLED encapsulation

The efficient 810 nm laser energy conversion of glass frit had been proven to be the key to the long-term hermetic encapsulation of Organic Light Emitting Display (OLED). A direct laser energy conversion laser-assisted Bi₂O₃-B₂O₃-ZnO-Nd₂O₃ sealing glass material without extra laser absorbent such as carbon black, was designed and systematically investigated. The addition of Nd₂O₃, as glass modifiers with higher cationic field strength, could be conducive to enhancing the polymerization of glass network structure, manifesting that the glass-transition temperature Tg, onset-crystallization temperature Tc and thermal stability ΔT (ΔT = Tc-Tg) increased, while thermal expansion coefficient CTE dropped to 9.72×10⁻⁶/°C and advantageously matched with the glass substrate (8±1×10⁻⁶/°C). More importantly, the absorption rate of BBZ-Nd glass was more than 50 % between 800∼810 nm owing to the 4f-4f electron transition of Nd³⁺ ions, and yet the reflectivity and transmittance of the wavelength at 800–810 nm were lower. As optimal compositions, the addition of 3.0 wt% Nd₂O₃ in Bi₂O₃-B₂O₃-ZnO-Nd₂O₃ glass frit with higher absorption coefficients (80 %) led to instantaneous bonding encapsulation between glass substrates without interfacial cracks or pores with the 808 nm wavelength of the laser at 20 W and 2.4 mm/s.     

Sm2O3掺杂的Bi2O3-ZnO-Nb2O5基陶瓷的烧结特性与介电性能

用传统的固相法合成了Sm2O3掺杂的Bi2O3-ZnO-Nb2O5(BZN)基陶瓷(Bi1.5-xSmxZn0.5)(Zn0.5Nb1.5)O7(0≤x≤0.6,BSZN),通过XRD、AV2782阻抗分析仪等测试手段对其烧结行为、相结构及介电性能进行了系统研究.结果表明纯BZN陶瓷的结构为立方焦绿石单相;当Sm2O3掺杂量较少(0＜x≤0.5)时,样品的相结构仍然保持立方焦绿石单相;随着Sm2O3掺杂量的进一步增加(x≥0.6),样品出现其它相.同时,试样的介电性能随结构的变化而呈现有规律的变化.     

Emission Analysis of Pr3 +& Tm3 +: B2O3-BaO-LiF/AlF3 Glasses

We report here on the preparation and emission properties of Pr³⁺(4f²) and Tm³⁺ (4f¹²) ions doped in newly developed to transparent glassy matrices of BBLi (= B₂O₃-BaO-LiF) BBAl (= B₂O₃-BaO-AlF₃). Under an UV source (355 nm), both the Tm³⁺: BBLi and Tm^{3 +}: BBAl glasses have shown bright blue emission at 452 nm. With regard to both the Pr³⁺: BBL and Pr³⁺: BBAl glasses red emission have been noticed upon excitation with blue excitation wavelength (445 nm).These results have also been obtained from the measurement of their emission spectra. For such emission bands, decay curves have been recorded to obtain their lifetimes. We have prepared optical glasses with good transparency and stability. From the measurement of XRD spectra, amorphous nature of these glasses have been confirmed. Between the two glasses studied, glass containing Li has demonstrated an extended UV transmission and also it has revealed an improved NIR transmission ability compared to the other glass with LiF.     

Structure-Property Correlation in BaO-TiO2-B2O3 Glasses: Glass Stability,Optical, Hydrophobic,and Dielectric Properties

Glasses in the x(BaO-TiO₂)-B₂O₃ (x = 0.25, 0.5, 0.75, and 1 mol.) system were fabricated via the conventional melt-quenching technique. Thermal stability and glass-forming ability as determined by differential thermal analysis (DTA) were found to increase with increasing BaO–TiO₂ (BT) content. However, there was no noticeable change in the glass transition temperature (T_g). This was attributed to the active participation of TiO₂ in the network formation especially at higher BT contents via the conversion of the TiO₆ structural units into TiO₄ units, which increased the connectivity and resulted in an increase in crystallization temperature. Dielectric and optical properties at room temperature were studied for all the glasses under investigation. Interestingly, these glasses were found to be hydrophobic. The results obtained were correlated with different structural units and their connectivity in the glasses.     

Responsibility of Bi2O3 Content in Photon,Alpha, Proton,Fast and Thermal Neutron Shielding Capacity and Elastic Moduli of ZnO/B2O3/Bi2O3 Glasses

The effect of Bi₂O₃ content on photon, alpha particle, proton, fast and thermal neutron shielding capacity, and elastic moduli of 10ZnO-(90-x)B₂O₃-xBi₂O₃ (ZBB-glasses): x?=?25–50 mol% has been investigated. The mass density and Bi-content of the ZBB-glasses had the greatest impact on the values of mass and linear attenuation coefficients. The mass and linear attenuation coefficients values were followed the trend (ZBB25)_MAC,LAC?<?(ZBB30) _MAC,LAC?<?(ZBB35) _MAC,LAC?<?(ZBB40) _MAC,LAC?<?(ZBB45) _MAC,LAC?<?(ZBB50) _MAC,LAC. The mean free path (MFP) and half value layer (HVL) were having the same trend and opposite to which obtained in mass and linear attenuation coefficients. All the ZBB-glasses showed almost similar charged particle shielding capacity. However, ZBB50 had a comparable charged particle absorption efficiency. There was a 57% growth in fast neutron removal cross section as Bi₂O₃ molar concentration increased to 50% in the ZBB-glass matrix. ZBB50 possesses the highest fast neutron removal cross section among the ZBB-glasses. In terms of thermal neutron absorbing capacity, the presence of B in the glass matrix ensures that the ZBB-glasses are good thermal neutron absorption. ZBB25 has the highest thermal neutron absorption capacity among the investigated glasses. Generally, ZBB-glasses can be adopted for photon, thermal neutron, proton, and alpha particle shielding purposes. In addition, elastic (shear, longitudinal, and Young’s) moduli and Poisson’s ratio are changed significantly with the increase of Bi₂O₃ content mol% in ZBB-glasses.

     

Enhanced energy storage properties of Ba0.4Sr0.6TiO3 lead-free ceramics with Bi2O3-B2O3-SiO2 glass addition

In this study, we present an effective strategy to enhance the energy storage properties of Ba_0.4Sr_0.6TiO₃ (BST) lead-free ceramics by the addition of Bi₂O₃-B₂O₃-SiO₂ (BBS) glass, which were prepared by the conventional solid state sintering method. The phase structure, microstructure and energy storage properties were investigated in detail. It can be found that the Ba_0.4Sr_0.6TiO₃-x wt%(Bi₂O₃-B₂O₃-SiO₂) (BST- x wt%BBS, 0 ≤ x ≤ 12) ceramics possess large maximum polarization (P_max), low remanent polarization (P_r) and slim polarization electric field (P-E) hysteresis loops. The breakdown strength (BDS), recoverable energy storage density (W_rec) and energy storage efficiency (η) are enhanced obviously with the addition of BBS glass. The BST-9 wt%BBS ceramic is found to exhibit excellent energy storage properties with a W_rec of 1.98 J/cm³ and a η of 90.57% at 279 kV/cm. These results indicate that the BST-x wt%BBS ceramics might be good candidates for high energy storage applications.     

FTIR Spectral Characterization,Mechanical and Electrical Properties of P2O5-Li2O-CuO Glass-Ceramics

Silicon - In the present investigation, X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy were employed to study the crystallization of...