材料期刊网

pp和p碰撞中J/ψ的光生过程（英文）

朱佳庆 , 何俊伟 , 李云德

原子核物理评论

计算了pp和p碰撞中J/ψ的领头阶光生过程的产额。运用非相对论量子色动力学回顾了重夸克偶素产生的色单态机制与色八重态机制,并将它们分别用于处理直接光子过程和分解光子过程。通过与J/ψ产生的领头阶结果的对比可以看出,光生过程对J/ψ产额的修正在大横动量区域变得明显。

关键词: 光生过程 , 大横动量区域 , 重夸克偶素

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

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

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

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

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-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

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:10.3321/j.issn:1000-324X.2006.06.039

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c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 , 磁控溅射 , 共掺

Li-Fe-P-H2O系热力学分析

赵中伟 , 刘旭恒

中国有色金属学报

运用同系线性规律对Li-Fe-P-H2O系中缺少的LiFePO4和Li3PO4的△GΘ进行估算.结合已有的热力学数据,运用ψ-pH图的绘制原理,得到25℃时Li-Fe-P-H2O系在不同浓度下的ψ-pH图.结果表明,在水溶液中,LiFePO4具有较大的热力学稳定区域,这对湿法制备LiFePO4很有利.根据所绘制的热力学平衡图,详细讨论了各种LiFePO4软化学制备方法的可行性途径,并就液相法制备LiFePO4可能的技术途径和条件进行分析,为在水溶液中用软化学法制备LiFePO4提供理论依据.

关键词: Li-Fe-P-H2O系 , 磷酸铁锂 , 热力学

J4不锈钢及化学镀Ni-P和Ni-Cu-P镀层在液-固两相流中的冲刷腐蚀行为

方信贤白允强王章忠

金属学报 doi:10.3724/SP.J.1037.2009.00499

用质量损失法系统研究了不同温度(25和50℃)和不同冲刷速率(0.63-1.88 m/s)下,J4不锈钢、Ni-P和Ni-Cu-P合金镀层, 及对比材料316L不锈钢在液-固两相流(20% H₂SO₄+20 g/L Al₂O₃)中的冲刷腐蚀行为. 结果表明:不锈钢和镀层的抗冲刷腐蚀性能由高到低依次为镀态Ni-Cu-P, 镀态Ni-P,热处理态Ni-Cu-P, 316L, J4. 提高两相流介质温度均使它们的冲刷腐蚀速率增大. 316L不锈钢在25℃液-固两相流介质中的冲刷腐蚀速率分别为镀态Ni-Cu-P, 镀态Ni-P和热处理态Ni-Cu-P镀层的8.5倍, 8倍和2.6倍以上, 而在50℃下分别为392倍, 80倍和14.8倍以上; J4不锈钢在25和50℃液-固两相流介质中的冲刷腐蚀速率分别为316L不锈钢的28倍和13倍以上. 在25和50℃, J4不锈钢分别为选择性腐蚀和均匀腐蚀, 而316L不锈钢均为轻微选择性腐蚀, Ni-P和Ni-Cu-P合金镀层均为均匀腐蚀.

关键词: Ni-Cu-P , Ni–P , J4 stainless steel , 316L stainless steel , liquid–solid two–phase flow , erosion and corrosion