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CaS:TmF₃粉末蓝色发光材料的制备

孙甲明 , 钟国柱 , 范希武 , 郑陈玮 , Gerd．O．Mueller , ReginaMuller－Mach

本文研究了S＋H₂，S；H₂S＋H₂；H₂S，S＋H₂S和S＋H₂S十H2等不同气氛下用CaCO₃硫化法制备的CaS粉末中的CaSO₄和CaO杂质相的含量与反应气氛和反应方法的关系．X射线衍射分析表明，CaSO₄和CaO杂质相的含量与反应气氛有密切的联系．CaS粉末中F^＋中心（带两个正电荷的S空位俘获一个电子）的数量与反应原材料和CaSO₄和CaO杂质相的含量有关．光致发光的激发光谱表明，在CaS：TmF₃发光粉末中存在由Tm^3＋离子发光中心向F^＋中心的能量传递，CaS粉末大量的F^＋中心的存在不利于CaS：TmF₃蓝色发光效率的提高．通过对不同气氛下制备的CaS粉末F^＋中心、CaSO₄和CaO杂质相的含量进行分析和比较，找到了制备适用于CaS：TmF₃发光材料的CaS粉末的最佳方法．

关键词: CaS , null , null , null

用Fourier分解法测量材料表面的Mueller矩阵

吴云智 , 魏庆农 , 汪世美 , 冯巍巍

量子电子学报 doi:10.3969/j.issn.1007-5461.2007.06.011

测量系统采用双旋转延迟器结构,通过两个1/4波片的周期变化,对入射光、散射光的偏振态进行调制.由探测光强的25个Fourier分解系数可以计算得到样品的Mueller矩阵.为了检测测量系统的准确性,将测量的16个自由空间Mueller矩阵分量和理想情况下的自由空间Mueller矩阵分量进行比较,并给出了每个矩阵分量的标准误差.最后,通过测量聚四氟乙烯样品板的Mueller矩阵,定量地分析样品的退偏效应.

关键词: 光学偏振 , Mueller矩阵 , Fourier分解 , 聚四氟乙烯

Phase relations in the system La2O3-B2O3-P2O5

Journal of Alloys and Compounds

The subsolidus phase relations in the system La2O3-B2O3-P2O5 were investigated. The system can be divided into 12 three-phase regions. There are nine binary compounds and one ternary compound in this system. The ternary compound La7O6(BO3)(PO4)(2) has a monoclinic structure, space groups P2(1)/n, with lattice constants a = 7.0172 Angstrom, b = 17.9125 Angstrom, c = 12.6500 Angstrom, beta = 97.516 degrees, V = 1576.39 Angstrom(3), and Z = 4.

关键词: La2O3-B-3-B2O3-P2O5 system;phase relations;ternary compounds

Magnetic properties and exchange bias in Mn(2)O(3)/Mn(3)O(4) nanoclusters

Journal of Applied Physics

Mn(2)O(3)/Mn(3)O(4) nanoclusters were prepared by air oxidation of Mn(3)O(4) nanoparticles. The nanoparticles located at the surface of the Mn(2)O(3)/Mn(3)O(4) nanoclusters are oxidized to Mn(3)O(4) to form the special structure of the Mn(2)O(3)/Mn(3)O(4) nanoclusters. An exchange bias was observed in the Mn(2)O(3)/Mn(3)O(4) nanoclusters, which was induced by exchange coupling between ferromagnetic Mn(3)O(4) and antiferromagnetic Mn(3)O(4) phases. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3055349]

关键词: mn3o4;nanoparticles;anisotropy;particles;nanorods;mn2o3

Gibbs Free Energy of Formation of 3Y_2O_3·5Al_2O_3

XU Xiuguang WANG Changzhen TU Ganfeng Northeast University of Technology , Shenyang , China.

材料科学技术（英文）

Thermodynamic properties of 3Y_2O_3·5Al_2O_3 double compound have been determined with CaF_2 single crystal electrolyte galvanic cell at 1049 K to 1230 K.The galvanic cell used can be expressed as: Pt,O_2(g)丨Y_2O_3(s),YOF_((s))丨CaF_2丨YOF_((s)), 3Y_2O_3·5Al_2O_(3(s))丨Al_2O_(3(s))丨O_2(g),Pt, of which the cell reaction is; 3Y_2O_(3(s))+SAl_2O_(3(s))=3Y_2O_3·SAl_2O_(3(s)) The following result is obtained: A_fG°(3Y_2O_3·5Al_2O_3)=-939500+765.90T±710J/mol where,△fG°(3Y_2O_3·5Al_2O_3)is the free energy of formation of 3Y_2O_3·5Al_2O_3 from Y_2O_3 and Al_2O_3.

关键词: rare earth , null , null

Na_2O-Ga_2O_3系相平衡研究

王新华 , 古山贞夫 , 福泽章

金属学报

用示差热分析(DTA)和X射线衍射(XRD)方法测定Na_2O—Ga_2O_3(>50mol％Ga_2O_3)系相平衡图结果表明,该二元系中有Na_2OGa_2O_3,2Na_2O 3Ga_2O_3,Na_2O 3Ga_2O_3和Na_2O 5Ga_2O_3四个中间化合物2Na_2O 3Ga_2O_3在温度高于976±8℃时分解为Na_2O Ga_2O_3和Na_2O 3Ga_2O_3 Na_2O Ga_2O_3,Na_2O 3Ga_2O_3和Na_2O 5Ga_2O_3均为异分熔化化合物,其熔化分解温度分别为1382±1℃,1285±5℃和1417±4℃给出了新发现的化合物2Na_2O·3Ga_2O_3和Na_2O_3 Ga_2O_3的X射线衍射特征数据

关键词: Na_2O , Ga_2O_3 , Na_2O·Ga_2O_3 , 2Na_2O·3Ga_2O_3 , Na_2O·3Ga_2O_3 , Na_2O·5Ga_2O_3 , phase relation , phase diagram , null , null , null , null

Electrical Relaxation in Mixed Alkali Bi2O3-K2O-Li2O-Fe2O3 Glasses

E.E.Shaisha , Sh.F.El-Desouki , I.Shaltout , A.A.Bahgat

材料科学技术（英文）

A new glass system (Bi2O3)50(Fe2O3)10(Li2O)x(K2O)40-x, where x changes in steps of 5 mole fraction between 0 and 40, was selected to study the electrical relaxation and the mixed alkali effect (MAE) phenomena. Measurements of ac conductivity σac, dielectric permittivity ε' and loss factor tan± in the frequency range of 0.12~102 kHz and in the temperature range of 300~650 K were carried out. The temperature dependence of the ac conductivity shows a slow increasing rate at low temperature and high frequency and a rapid increase at high temperature and low frequency. At constant temperature, the ac conductivity is found to be proportional to ωs, where s is the frequency exponent, which is less than 1. Analysis of the conductivity data and the frequency exponent shows that the overlapping large polaron tunnelling (OLPT) model of ions is the most favorable mechanism for the ac conduction in the present glass system. The ac response, the dc conductivity and dielectric relaxation have the same activation energy and they originate from the same basic transport mechanism. The results of the dielectric permittivity show no maximum peak in the temperature and frequency range studied. This absence of maximum peak is an indication of non-ferroelectric behavior of all the studied samples. The MAE has been detected in the ac conductivity, which is the same as the classical MAE in the dc conductivity. The electrical parameters such as dielectric permittivity ε' and real dielectric modulus M' show a typical minimum deviation from linearity by about two orders of magnitude. The loss factor tanδ and the imaginary dielectric modulus M" are insignificantly dependent on composition even at the same transition temperature Tg.

关键词: Dielectric permittivity , null , null , null

Li2O-Na2O-K2O-CaO-MgO-Al2O3-SiO2系统乳浊釉的研究

滕元成

硅酸盐通报 doi:10.3969/j.issn.1001-1625.2002.06.002

对Li2O-Na2O-K2O-CaO-MgO-Al2O3-SiO2系统釉进行了较全面的正交试验研究,找到了影响该系统釉乳浊及釉面质量的主次因素,获得了性能良好的乳浊釉及其较优乳浊釉配方.

关键词: Li2O , 正交试验 , 乳浊釉

Na2O-Al2O3-B2O3玻璃的热学性质和红外光谱

殷海荣 , 武丽华 , 陈福 , 安百江

硅酸盐通报 doi:10.3969/j.issn.1001-1625.2006.04.035

制备了Na2O-Al2O3-B2O3系统低熔点玻璃,确定了Na2O-Al2O3-B2O3系统玻璃成玻范围,研究了玻璃的转变温度(Tg)、热膨胀系数(α)和玻璃的红外光谱,表明这种玻璃的熔化温度低、转变温度也较低、玻璃的热膨胀系数较大,在近红外区有一水分的吸收带,在中红外区有B-O、Al-O的特征吸收带,以及玻璃的Tg、α与玻璃组成的关系.

关键词: 硼酸盐玻璃 , 低熔点玻璃 , 热性质 , 红外光谱