材料期刊网

SYNTHESIS OF ULTRAFINE PLZT POWDER BY A SIMPLE CO- PRECIPITATION METHOD

H. Ying1) , X. D. Sun1) , Q. B. Yang1) , J. B. Li2) , Y. M. Wang2) , Z. Zhang3) and J. You3)1) School of Materials and Metallurgy , Northeastern University , Shenyang 110006 , China2) Departm ent of Materials , School of Mechanical Engineering , Shenyang University , Shenyang110044 , China3) Liaoning Analyzing and Testing Research Center , Shenyang 110015 , China

金属学报(英文版)

Starting from cheap inorganic salts , ultrafine P L Z T po w ders were synthesized by a co pre cipitation m ethod . The results show that the precursor precipitate obtained by the co precipita tion method transfor ms co m pletely to P L Z T phase by calcining at 420 ℃ for 4 hours , about300 ℃low er than the nor m al transform ation te m perature of P L Z T obtained by m ixed oxidemethod . The effect of residual N H4 N O3 in the precursor precipitate on transfor m ation te m perature of the P L Z Tpow der w as investigated . The residual N H4 N O3 in the precursor po w der can reduce further the P L Z Ttransfor m ation tem perature to about 300 ℃, but a sm alla mount of Zr O2 and Pb Ti O3 re m ained . By a proper control of the synthesizing route , a P L Z T po w der with a pri m ary particle size of 10 n m and an agglom eration size of 0 3 μm hasbeen produced .

关键词: P L Z T , null , null

Li2 CO3对烧结焊剂SJ601吸潮性和脱渣性影响

张绍棋 , 闫焉服 , 王广欣 , 顾天亮

材料热处理学报 doi:10.13289/j.issn.1009-6264.2016-X339

通过在自制的烧结焊剂S J601中添加Li2CO3,用304不锈钢埋弧对接,研究并分析了Li2CO3对SJ601的吸潮性和脱渣性的影响及机理.结果表明:在S J601中添加适量的Li2CO3能减少烧结焊剂的表面气孔,有利于提高SJ601的抗潮能力,当Li2CO3质量分数超过4％时,将不利于提高S J601的抗潮能力,添加Li2CO3有利于提高SJ601的脱渣性,当Li2CO3质量分数超过8％时,熔渣表面会形成波浪状结构,明显提高了SJ601的脱渣性.

关键词: 烧结剂 , SJ601 , 焊接 , 吸潮性 , 脱渣性

新型三元锂离子正极材料Li2 Ru1/3 Co1/3 M1/3 O3的合成及其电化学性能?

朱圆金枝 , 钱斌 , 须静怡 , 孔凡军 , 孙蕾 , 韩志达 , 张平 , 杨刚 , 江学范

功能材料 doi:10.3969/j.issn.1001-9731.2014.增刊(Ⅱ).025

利用高温固相反应法制备了新型三元锂离子电池正极材料 Li2 Ru1/3 Co1/3 M1/3 O3(M＝Mn、Ni、Fe)。通过 X 射线衍射技术和电化学性能测试对Li2 Ru1/3 Co1/3 M1/3 O3的微观结构及其电化学性能进行了表征。研究结果表明,Li2 Ru1/3 Co1/3 Ni1/3 O3和Li2 Ru1/3 Co1/3 Fe1/3 O3为六方层状结构,空间群为 R-3M,而 Li2 Ru1/3 Co1/3 Mn1/3 O3保持了单斜结构；电化学性能测试表明 Li2 Ru1/3 Co1/3 Mn1/3 O3的电化学性能优于掺杂Fe和Ni 的三元材料,该材料具有良好的循环性能,在电流密度为16 mA/g 情况下,首次充电容量达到190 mAh/g,首次放电容量为171 mAh/g,50次循环后容量保持率为98％。

关键词: 锂电池 , Li2Ru1/3Co1/3M1/3O3正极材料 , 结构 , 电化学性能

Li2 O-ZnO-SiO2系微晶玻璃的结晶行为与热膨胀变化规律

杨舟 , 卢安贤 , 刘树江 , 肖卓豪

材料导报

以Li2O-ZnO-SiO2系统为基础玻璃组成,通过DTA、XRD、SEM及热膨胀系数等测试手段分别对不含Al2O3和含5wt%Al2O3的微晶玻璃的结晶行为、结构和热膨胀变化规律进行了研究探讨.结果表明,高热膨胀相方石英微晶体较快生长的温度为750℃左右,Al2O3部分取代SiO2后对方石英的析出有阻碍作用,同时导致低热膨胀锂辉石微晶体的生成.

关键词: 玻璃 , 微晶玻璃 , 晶化行为 , 热膨胀系数

晶核剂对Li2 O-Al2 O3-SiO2系统微晶玻璃结构和性能的影响

刘树江 , 卢安贤 , 肖卓豪 , 杨舟

材料导报

通过传统熔体冷却法制得了以P2O5和TiO2为晶核剂的Li2O-Al2O3-SiO2系统基础玻璃,并经过热处理制得了微晶玻璃.利用红外光谱分析、X射线衍射分析和扫描电子显微镜等对晶化试样的物相和显微结构进行了研究,着重探索了不同晶核剂对玻璃析晶、微晶玻璃结构、微晶玻璃力学和热学性能的影响.结果表明:TiO2更有利于玻璃析晶,但以P2O5为晶核剂的微晶玻璃具有更好的力学和热学性能.

关键词: Li2O-Al2O3-SiO2 , 微晶玻璃 , 晶核剂 , β-石英固溶体

Preparation of Li-B alloy and study of its microstructure and discharge characteristics

Zhijian LIU , Zhiyou LI , Wei DUAN , Xuanhui QU , Baiyun HUANG , Siqi ZHANG

材料科学技术（英文）

A LI-B alloy has been prepared using a pretreated amorphous B powder and pure Li ingot as starting materials by continually slow addition of B powder and intensified stirring in the process of melting. The microstructure and the discharge characteristic of the materials have been investigated. Results show that the problem of temperature control in synthesis would be modified by means of continual addition of B powder, the Li7B6 would be more finery distributed in the metal Li by means of intensified stirring. The discharge characteristic of the Li-B alloy using amorphous B as starting materials is almost the same with that of using crystalline B.

关键词:

溶胶-凝胶法制备Li2O-ZnO-B2O3-SiO2系低温玻璃料

高元 , 侯永改 , 李文凤 , 李广锋 , 丁志静 , 黄庆飞

硅酸盐通报

以有机锌盐、有机锂盐、正硅酸乙酯、硼酸为原料,乙醇为溶剂,采用溶胶-凝胶法成功制备出Li2O-ZnO-B2O3-SiO2系微晶玻璃料,通过TG-DTA、FTIR、XRD等材料测试方法对Li2O-ZnO-B2O3-SiO2系玻璃料进行分析.结果表明:最佳pH值是4.5,反应温度是40℃,最佳配比Li2O∶ ZnO∶B2O3:SiO2=15∶ 15∶ 10∶ 60;干凝胶开始析出晶体的温度为480℃;当热处理温度为660℃时,能够生成稳定的SiO2晶体,样品晶粒粒径为55.1 nm.

关键词: 溶胶-凝胶法 , Li2O-ZnO-B2O3-SiO2系玻璃 , 晶粒尺寸

Phase relations of the system Li(2)O-Gd(2)O(3)-B(2)O(3) and the structure of a new ternary compound

Journal of Alloys and Compounds

The subsolidus phase relations of the system Gd(2)O(3)-Li(2)O-B(2)O(3) are investigated by means of X-ray diffraction (XRD) analyses. There are eight binary compounds and two ternary compounds in this system. The phase diagram comprises thirteen three-phase regions. The ternary compound Li(6)Gd(BO(3))(3) is refined from the powder XRD data by the Rietveld method. It has a monoclinic structure with cell parameters a=7.2277(2) Angstrom, b=16.5057(5) Angstrom, c=6.6933(2) Angstrom, beta=105.3737(10)degrees and space group P2(1)/c. The rationality of the Li(6)Gd(BO(3))(3) structure is examined by the Brown theory and IR spectra. (C) 2002 Elsevier Science B.V. All rights reserved.

关键词: oxide materials;rare earth compounds;X-ray diffraction;phase diagram

Li_2B_4O_7晶体的比热、导温和导热性能

徐一斌 , 奚同庚 , 倪鹤林 , 段炼 , 李明华 , 蔡忠龙 , 费扬

材料研究学报

用DSC和激光热导仪分别测定了Li2B4O7(LBO)晶体350—970K范围内的比热和630—970K范围内不同主晶轴方向的导温系数.并由此得出了导热系数和声子平均自由程.

关键词: Li_2B_4O_7晶体 , specific heat , thermal diffusivity , thermal conductivity , phonon mean

Li2MnSiO4/C复合材料的制备与性能表征

张倩倩 , 庄全超 , 徐守冬 , 邱祥云 , 崔永丽 , 史月丽

硅酸盐通报

本文分别以柠檬酸(C6H8O7·H2O)和蔗糖(C12 H22 O11)为碳源,采用溶胶凝胶法合成了Li2 MnSiO4/C材料.X射线衍射(XRD)结果显示合成出的Li2 MnSiO4/C材料均属于正交晶系Pmn21空间群.扫描电子显微镜(SEM)结果表明合成出的Li2 MnSiO4/C1(以C6H8O7·H2O为碳源)材料粒径均在500 nm左右,Li2MnSiO4/C2(以C12 H22O11为碳源)材料粒径在1μn左右.充放电测试结果显示,Li2MnSiO4/C2较Li2 MnSiO4/C1有较高的首次不可逆容量；两种电极材料经几周循环后均具有稳定的循环性能,所制得的Li2 MnSiO4/C1较Li2 MnSiO4/C2具有高的循环容量.

关键词: 锂离子电池 , Li2 MnSiO4/C , 碳源 , 包覆 , 电化学性能