Modeling the viscosity of silicate melts containing Fe oxide: FeO/Fe2O3 containing system

In the present study, the viscosity experimental data for the Fe_tO-containing silicate melts under oxidation atmosphere, which Fe³⁺ and Fe²⁺ co-exist were critically evaluated and model parameters related to Fe₂O₃ were optimized to best reproduce all reliable experimental viscosity data. The charge compensation effect on the viscosity for the systems containing Fe₂O₃ was modeled with the Gibbs energies for LiFe, NaFe, KFe and CaFe₂ “associate species” formation. The viscosities of a wide compositional and temperature range of binary, ternary and multicomponent melts containing Fe₂O₃–FeO–SiO₂–Al₂O₃–CaO–MgO–Li₂O–Na₂O–K₂O–MnO–Ti₂O₃–TiO₂ were well reproduced by the present model within the scatter of experimental data.     

The phase relations in the FeO-MgO-Al2O3-SiO2 system: assessment of thermodynamic properties and phase equilibria at pressures up to 30 GPa

Thermodynamic parameters for minerals in the FeO-MgO-Al₂O₃-SiO₂ (FMAS) system have been assessed from phase equilibria at pressures up to 30 GPa. All solid solution phases except orthopyroxene have been described by the sublattice model. Calculated phase diagrams of end member systems, exchange reactions in the FMAS system, phase equilibria for fixed compositions at pressures up to 30 GPa are in a reasonable agreement with the experimental data. The most critical data in the MgO-Al₂O₃-SiO₂ (MAS) system were compositions of garnet in equilibrium with Mg-rich ilmenite at 1273 K. To reproduce the experimentally observed Fe-Mg partition between perovskite and magnesiowustite, it is necessary to take into account the presence of Fe³⁺ ions in perovskite. The phase diagram of the FMAS system for pyrolite composition has been calculated in the temperature range of 1500 to 2400 K at pressures between 12 to 32 GPa.     

Coupled experimental study and thermodynamic modeling of the MnO-Mn2O3-Ti2O3-TiO2 system

A coupled experimental study and thermodynamic modeling of the MnO-Mn₂O₃-Ti₂O₃-TiO₂ system at 1 bar total pressure is presented. Classical equilibration and quenching experiments followed by the phase analysis using electron probe microanalysis (EPMA) and X-ray diffraction (XRD) were employed to obtain equilibrium compositions of the liquid and solid solutions in air. The molten oxide phase was described by using the Modified Quasichemical Model which considers short-range ordering, and the Gibbs energies of the solid solutions (pseudobrookite, ilmenite and spinel) were described using the Compound Energy Formalism based on their crystal structures. A set of optimized model parameters of all phases was obtained, which reproduces all available and reliable thermodynamic data and phase diagrams within experimental error limits from 298 K (25 °C) to above the liquidus temperatures over the entire range of composition under oxygen partial pressures from metallic saturation to 1 bar. The complex phase relationships in the system have been elucidated and discrepancies among the experimental data have been resolved. The database of the model parameters can be accessed by FactSage software with the Gibbs energy minimization to calculate any phase diagrams and thermodynamic properties of the MnO-Mn₂O₃-Ti₂O₃-TiO₂ system.     

Modeling and compensation of the machine directional register in roll-to-roll printing

For mass manufacturing of printed electronics using roll-to-roll printing, high-resolution register control among multi-layers is required. A mathematical model of a machine directional (MD) register was derived, where the compensation method was proposed to cancel out the upstream disturbance of the MD register. The proposed MD register model and compensator could be used to improve the performance of the MD register controller in multi-layer roll-to-roll printed electronics. The proposed compensator was experimentally verified at various operating conditions. The results show that the proposed compensator improves the control performance of the MD register in overcoming upstream disturbances     

Calculation and correlation of the Na2SO4–NaCl–H2O2–H2O system at the temperature 288.15 K using the extended Pitzer model

The extended Pitzer model has been used for calculation and correlation of the ternary NaCl–H₂O₂–H₂O, Na₂SO₄–H₂O₂–H₂O and the quaternary Na₂SO₄–NaCl–H₂O₂–H₂O systems at the temperature of 288.15 K. The necessary thermodynamic functions (binary and ternary parameters of interaction and thermodynamic solubility products) have been derived from a least-squares optimization procedure with couples activity coefficient with solubility data and the theoretical solubility isotherms has been plotted. Good agreement with experimental solubility for ternary and quaternary mixtures indicates that the model can be successfully used to predict the component solubility of the electrolyte–nonelectrolytes–water systems containing peroxide. In addition, the Pitzer interaction parameters and the thermodynamic solubility product of 4Na₂SO₄⋅2H₂O₂⋅NaCl and Na₂SO₄⋅0.5H₂O₂⋅H₂O at 288.15 K are obtained.     

Microstructural,dielectric and piezoelectric properties of low-temperature sintering Pb(Co1/2W1/2)O3–Pb(Mn1/2Nb2/3)O3–Pb(Zr,Ti)O3 ceramics with the addition of Li2CO3 and Bi2O3

In this study, in order to develop the low-temperature sintering ceramics for multilayer piezoelectric devices, Pb(Co_1/2W_1/2)O₃–Pb(Mn_1/2Nb_2/3)O₃–Pb(Zr,Ti)O₃ (PCW–PMN–PZT) ceramics doped with Li₂CO₃, Bi₂O₃ and CuO as sintering aids were manufactured, and their microstructural, dielectric and piezoelectric properties were investigated. When the only CuO was added, specimens could not be sintered below 980 °C. However, when Li₂CO₃ and Bi₂O₃ with CuO were simultaneously added to the basic composition ceramics, specimens could be sintered below 980 °C. The addition of Li₂CO₃ and Bi₂O₃ were proved to lower sintering temperature of piezoelectric ceramics due to the effect of Li₂CO₃–Bi₂O₃ liquid phase. Piezoelectric properties of Li₂CO₃ and Bi₂O₃ added specimens showed higher values than those of the only CuO added specimens. At 0.2 wt% Li₂CO₃ and 0.3 wt% Bi₂O₃ added specimen sintered at 920 °C, the dielectric constant (ɛ_r) of 1457, electromechanical coupling factor (k_p) of 0.56 and mechanical quality factor (Q_m) of 1000 were shown, respectively. It is considered that these values are suitable for piezoelectric device application such as multilayer piezoelectric transformer and ultrasonic vibrator with pure Ag internal electrode.     

考虑硅衬底效应的基于TSV的3D IC电源分配网络建模

基于硅通孔TSV的3D-IC在电源分配网络PDN中引入了新的结构--TSV,另外,3D堆叠使得硅衬底效应成为不可忽略的因素,因此为3D-IC建立PDN模型必须要考虑TSV以及硅衬底效应。为基于TSV的3D-IC建立了一个考虑硅衬底效应的3D PDN模型,该模型由P/G TSV对模型和片上PDN模型组成。P/G TSV对模型是在已有模型基础上,引入bump和接触孔的RLGC集总模型而建立的,该模型可以更好地体现P/G TSV对的电学特性;片上PDN模型则是基于Pak J S提出的模型,通过共形映射法将硅衬底效应引入单元模块模型而建立的,该模型可以有效地反映硅衬底对PDN电学特性的影响。经实验表明,建立的3D PDN模型可以有效、快速地估算3D-IC PDN阻抗。     

BPA-NaOH-H2O体系电离及沉淀溶解平衡的建模及应用

研究了BPA-NaOH-H2O体系中电离及沉淀溶解平衡,首先按照是否有Na2BPA·6H2O(s)沉淀生成,将其分为Ⅰ、Ⅱ、Ⅲ和Ⅳ区,并据此建立了该体系的平衡模型,利用所建立的模型模拟了体系中各组分随加入NaOH量的变化分布情况,为研究该体系中各组分浓度的分布规律提供了理论依据.其次以特定BPA初始浓度(1.5 mol...     

Influences of substituting Na+ ions in Eu2+, Mn2+ doped Ba9Y2Si6O24 phosphors

Near-ultraviolet (NUV)-excitable phosphors composed of Ba_8.9-(1/2)pNa_pEu_0.1Y₂Si₆O₂₄ (p = 0–0.8) and Ba_8.7-qNa_0.4Eu_0.1Mn_qY₂Si₆O₂₄ (q = 0–0.4) were prepared via a solid-state reaction in a reducing atmosphere. The X-ray diffraction patterns of the obtained phosphors were examined to index the peak positions. After Na⁺ substitution for Ba²⁺ in the Ba_8.9Eu_0.1Y₂Si₆O₂₄ host lattice, the clear shift from green to yellow emission was observed. The Gaussian components of Ba_8.9-(1/2)pNa_pEu_0.1Y₂Si₆O₂₄ (p = 0, 0.4, and 0.8) phosphors were exploited by using the three different Eu²⁺ ion sites in the host lattice. The dependence of the luminescent intensity of the Mn²⁺ co-doped (q = 0–0.4) host lattices on the fixed Na⁺ and Eu²⁺ contents was also investigated. Co-doping Na⁺ with Mn²⁺ and Eu²⁺ emitters in the host structure enabled efficient energy transfer from Eu²⁺ to Mn²⁺. The mechanism underlying this energy transfer was also discussed. The Commission Internationale de I’Eclairage (CIE) coordinates near the yellow and red regions of the obtained phosphors were observed. Each of Ba_8.9Eu_0.1Y₂Si₆O₂₄, Ba_8.7Na_0.4Eu_0.1Y₂Si₆O₂₄, and Ba_8.6Na_0.4Eu_0.1Mn_0.1Y₂Si₆O₂₄ phosphors with a 405 nm LED chip was fabricated. The color rendering index (CRI, R_a) at correlated color temperature (CCT) with the CIE coordinates was exhibited for the LEDs. The thermal quenching and activation energy for the Ba_8.7Na_0.4Eu_0.1Y₂Si₆O₂₄ and Ba_8.6Na_0.4Eu_0.1Mn_0.1Y₂Si₆O₂₄ phosphors were measured.     

三维几何造型系统工程图模块的设计

二维CAD支撑软件系统模型巳经处于成熟的阶段，作为集标准化、智能化为一体的面向图形设计与绘图的集成系统，巳具有良好的互操作性和伸缩性，为了秉承扩张其优点，讨论分析了二维CAD支撑软件系统和三维几何造型系统体系结构和数据结构，并在二维CAD支撑软件系统模型和流程控制机制基础上设计了实现三维几何造型系统中的工程图模块。     

Fe_2O_3基陶瓷的气湿敏特性

论述了由不同制备工艺获得的Ｆｅ２Ｏ３陶瓷及各种添加剂下表面羟基和吸附氧的形成和性质，分析了表面羟基和吸附氧的酸碱性对气湿特性的影响。