材料期刊网，材料期刊，材料类期刊，材料期刊投稿

A 2D full cell thermo-electric model of 160kA drained cell was set up using finite element code to calculate its freeze profile, then the drained cell model was modified according to the freeze profile computed and its heat balance was calculated. Compared with that of a 160kA conventional Hall-Heroult cell (H-H cell), though the melts volume of the drained cell reduced greatly, the whole heat loss from it didn't drop down apparently, and an analysis was presented in the paper. On the other hand, the anode- cathode distance (ACD) of a drained cell was much less than that of a H-H cell, so the voltage drop on it and heat produced decreased too, steps should be taken to keep a workable heat balance on a drained cell.

关键词: drained cell , null , null

Electrical Properties of Li-doped P-type ZnO Ceramics

A.H. Salama

材料科学技术（英文）

Li-doped p-type ZnO ceramics were prepared by conventional methods according to the chemical formula Zn_1-x Li_xO₂ where x=0.5, 1.0, 1.5 and 2.0 mole fraction, respectively. The crystal structures of the prepared samples were studied by X-ray diffraction analysis. The dielectric properties (including dielectric constant ε'
and dielectric loss ε") and dc-electrical conductivity [σ(Ω^-1·cm^-1)] were investigated. The dielectric constant ε' was sharply decreased at the low frequency range and independent on frequency at high frequency range. Otherwise, the dielectric loss "00 varied with frequency and showed absorption peak located from 200 Hz to
4 kHz and moved to higher frequency as the concentration of Li⁺ doped increased. It was found that dc-electrical conductivity log¾ varied from -9 to-5 and the energy gap width were calculated by using Arrhenius equation. The p-type conductivity of Li-doped ZnO may be attributed to the formation of a LiZn-Li_i donor complex, which is limited by reducing the amount of Li_i.

关键词: P-type ZnO ceramics

大爆炸核合成相关的8Li(d, p)9Li反应截面测量

李志宏 , 柳卫平 , 白希祥 , 郭冰 , 连钢 , 颜胜权 , 王宝祥 , 陆昀 , 曾晟 , 苏俊

原子核物理评论 doi:10.3969/j.issn.1007-4627.2005.01.006

利用8Li次级束测量了质心系能量7.8 MeV 2H(8Li, 9Li)1H反应的角分布, 导出了8Li(d, p)9Li反应的天体物理S因子及9Li→8Li+n虚衰变的渐近归一化系数.

关键词: 8Li(d,p)9Li反应 , 角分布 , 天体物理S因子 , 渐近归一化系数

Li1+xV3-yMyO8(M=Mo,P)高温阴极放电性能的研究

曹笃盟 , 李志友 , 周科朝

稀有金属材料与工程

采用固相反应法制备了Li1+xV3-yMyO8(M=Mo,P;0≤y≤0.4),研究了不同Mo和P含量对Li1+xV3O8相的影响,并首次对其进行了高温阴极放电性能的研究.结果表明:Mo和P掺杂量分别为y≤0.2和y＜0.2时可获得纯Li1+xV3O8相;Mo掺杂使Li1+xV3O8峰值电压提高0.3 V,比容量提高25%,嵌入的Li+量最高可达x=3.8;P掺杂(y≤0.20)对Li1+xV3O8的峰值电压和比容量影响较小.化学嵌锂实验也证实掺杂后的材料具有更快的Li+嵌入速度.

关键词: Li1+xV3O8 , 热电池 , 掺杂 , 比容量

Subsolidus phase relations of the ZnO-Li(2)O-P(2)O(5) system

Journal of Alloys and Compounds

As a systematic search for suitable flux to grow zinc oxide single crystals, the subsolidus phase relations of the ternary system ZnO-Li(2)O-P(2)O(5) were investigated by means of X-ray diffraction (XRD). There are 6 binary compounds, 5 ternary compounds and 17 three-phase regions in this system. A new compound, Li(6)Zn(P(2)O(7))(2), is found in this system based on XRD experiments. The phase diagrams of the pseudo-binary systems Li(3)PO(4)-ZnO and LiZnPO(4)-ZnO are investigated. It shows that the compounds, Li(3)PO(4) and LiZnPO(4), are not suitable as flux for the growth of ZnO single crystals below 1250 degrees C. (C) 2009 Elsevier B.V. All rights reserved.

关键词: ZnO-Li(2)O-P(2)O(5) system;Zno semiconductor;X-ray diffraction;Phase;diagram;lithium zinc phosphate;oxide crystal-growth;flux research;single-crystals;zno crystals;alpha-liznpo4;gamma-li3po4;equilibria;polymorph;liznpo4

Li、N共掺杂实现P型ZnO的机理探讨

杨昊 , 范广涵 , 李军

材料科学与工程学报

采用基于密度泛函理论的第一性原理赝势法计算了本征ZnO、N掺杂、Li掺杂以及Li、N共掺杂ZnO的能带结构、电子态密度和差分电荷分布.计算结果表明:N掺杂的受主能级局域性较强,导致N溶解度较低,Li替位原子受主能级较浅,但是会受到Li间隙原子的补偿.Li、N共同掺入时,N_o-Li_(Zn)复合受主结构并不是ZnO的主要P型来源,N_o受主可以与间隙原子Li_i形成N_o-Li_i结构,该结构可促进N的掺入,并抑制Li_i施主的补偿效应,因而对实现ZnO的P型非常有利.

关键词: ZnO , 第一性原理 , 密度泛函理论 , 双受主共掺杂

Mg-x Li-Al 变形镁合金微观组织与拉伸性能

许天才 , 彭晓东 , 张玺 , 陈元芳 , 姜军伟 , 陈洁

功能材料 doi:10.3969/j.issn.1001-9731.2014.07.013

利用光学显微镜(OM)、扫描电子显微镜(SEM)、X 射线衍射仪(XRD)分析了 Li 元素对 Mg-x Li-3Al 合金组织的影响,并用电子万能试验机测试合金的拉伸性能.结果表明,Li 含量的变化可以明显改变合金的相组成.当 m (Li)＜5．7％(质量分数)时合金由单一α-Mg 相组成；Li 含量在5．7％~10．3％(质量分数)之间时,合金为α-Mg＋β-Li 双相；m (Li)＞10．3％(质量分数)时合金为单一β-Li 相.合金的塑性随 Li 含量的升高而增加,铸态 LA113合金的延伸率高达37．36％,但挤压态下合金强度随 Li 含量升高而降低,挤压态 LA53合金具有最佳抗拉强度,达到263．28 MPa.当 Li 含量升高,合金中的第二相粒子会出现 Al12 Mg17转变为 LiMgAl2.

关键词: 镁锂合金 , 铸态 , 挤压态 , 微观组织 , 拉伸性能

YAl2p/Mg-14Li-1Al复合材料时效行为

吴国清 , 张涛 , 沙维 , 王素洁 , 黄正

稀有金属材料与工程

采用搅拌铸造的方法制备了YAl2p/Mg-14Li-1Al复合材料,并使用硬度试验、差热分析和X射线衍射等方法对该材料的时效行为进行了研究.结果表明,基体合金及其复合材料硬度的变化均与θ-MgLi2Al相的析出和分解有关.复合材料的强化效果来自于YAl2颗粒的加入以及基体合金的析出行为.其中,加入YAl2颗粒所产生的强化效果是稳定的,而基体合金的析出强化则是不稳定的且依赖于它自身的时效行为.此外,YAl2颗粒的加入延缓了时效行为的发生.

关键词: 镁锂合金 , 复合材料 , 金属间化合物 , 时效行为 , 硬度

Li-N-H共掺法制备 p型 ZnO薄膜

卢洋藩 , 叶志镇 , 曾昱嘉 , 陈兰兰 , 朱丽萍 , 赵炳辉

无机材料学报 doi:10.3724/SP.J.1077.2006.01511

采用Li-N-H共掺技术在玻璃衬底上生长p型ZnO薄膜. XRD结果表明共掺ZnO薄膜具有高度cll轴取向, Hall测试表明薄膜的电阻率为25.2Ω·cm, Hall迁移率为0.5cm²/(V·s), 空穴浓度为4.92×10¹⁷/cm³. 此外, p-ZnO薄膜在可见光区域具有90%的高透射率.

关键词: p-ZnO , magnetron sputtering , codoping