您的位置: 专家智库 > >

国家自然科学基金(10574049)

作品数:12 被引量:15H指数:3
相关作者:王永强刘莉袁松柳李建青陈子鹏更多>>
相关机构:华中科技大学武汉理工大学广东技术师范学院更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划更多>>
相关领域:一般工业技术电气工程理学金属学及工艺更多>>

文献类型

  • 10篇中文期刊文章

领域

  • 7篇一般工业技术
  • 4篇电气工程
  • 2篇金属学及工艺
  • 2篇理学
  • 1篇天文地球
  • 1篇电子电信

主题

  • 4篇LA
  • 4篇MN
  • 3篇CA
  • 3篇X
  • 3篇MNO
  • 2篇输运
  • 2篇PHASE_...
  • 2篇PT
  • 2篇ZNO
  • 2篇ALLOYS
  • 2篇MAGNET...
  • 2篇MGO
  • 2篇磁电
  • 2篇磁电阻
  • 2篇磁化
  • 2篇磁化强度
  • 1篇低压压敏电阻
  • 1篇电输运
  • 1篇电子输运
  • 1篇电阻

机构

  • 3篇华中科技大学
  • 2篇广东技术师范...
  • 1篇中南民族大学
  • 1篇武汉理工大学
  • 1篇洪湖市第二中...

作者

  • 2篇袁松柳
  • 2篇刘莉
  • 2篇任光明
  • 2篇王永强
  • 1篇田召明
  • 1篇缪菊红
  • 1篇尹诗岩
  • 1篇李云龙
  • 1篇宋运兴
  • 1篇徐萍
  • 1篇马争争
  • 1篇周远明
  • 1篇袁力
  • 1篇陈子鹏
  • 1篇李建青
  • 1篇孙奉娄
  • 1篇李派
  • 1篇何伟

传媒

  • 2篇Journa...
  • 1篇科学通报
  • 1篇武汉理工大学...
  • 1篇无机材料学报
  • 1篇Journa...
  • 1篇中南民族大学...
  • 1篇Rare M...
  • 1篇Scienc...
  • 1篇长江大学学报...

年份

  • 1篇2010
  • 1篇2009
  • 2篇2008
  • 6篇2007
12 条 记 录,以下是 1-10
排序方式:
Electrical Transport and Magnetic Properties of La_(0.67)Ca_(0.33)Mn_(1-x)Cr_xO_3 and La_(0.67+x)Ca_(0.33-x)Mn_(1-x)Cr_xO_3(0.04≤x≤0.08)
2008年
A comparative study for two different series, La0.67Ca0.33Mn1-xCrxO3 and La0.67+xCa0.33-x Mn1-xCrxO3 is performed with x changing from 0.04 to 0.08 through measurements of zero-field resistivity (p), magnetoresistance (MR) and ac susceptibility (Z) as functions of temperature (T). For the second group, a single insulator-metal transition was characterized by the resistivity maximum appears in p vs. T curve. For the first group, besides the resistivity peak appearing at higher temperatures, the sample shows evidence for the existence of another peak appearing at lower temperatures. Compared to the first group, the second group shows a significant enhancement in MR effect, while the measurement ofΧ-T dependence does not display obvious differences for the two series. Different behaviors observed in the two series are discussed by considering possible exchange interaction between Mn^3- ion and Cr^3- ion.
XIAO XunYUAN SongliuYIN ShiyanCHEN LingREN GuangmingMIAO JuhongYU Gongqi
La_(0.67)Sr_(0.33)MnO_3/MgO颗粒系统的电输运和磁电阻
2009年
用溶胶凝胶法制备La0.67Sr0.33MnO3(LSMO)粉末,并引入第二相MgO在不同的烧结温度下制备了(1-x)LSMO/xMgO铁磁颗粒系统.对样品的结构、电输运性质和磁电阻进行了系统的研究.结果表明:随MgO含量的增加,样品的电阻率增加、绝缘体金属转变向低温移动、低温电阻极小值现象变得更加明显以及样品的磁电阻增强,但当MgO含量增加到0.07以后,样品的绝缘体金属转变温度又重新增加,其磁电阻也几乎不变.运用颗粒之间的磁耦合关系和自旋极化隧穿机理,对实验结果进行了讨论.
任光明孙奉娄
关键词:磁电阻
La_(0.67)Ca_(0.33)MnO_3/MgO复合体系的磁化行为被引量:1
2008年
用溶胶凝胶自蔓延燃烧法和水浴包覆法制备了(1-x)La_(0.67)Ca_(0.33)MnO_3/MgO复合体系,系统研究了该体系的结构、电输运和磁化行为。在磁化强度随温度降低的变化关系中,观察到2个磁转变。对不同MgO含量的复合样品,观察到的第1个磁转变温度都相同,和纯LCMO的居里温度Tc相对应;观察到的第2个磁转变温度和测得的阻温关系中的Tp对应,随MgO含量的增加向低温移动。最后运用铁磁颗粒系统中颗粒之间的磁藕合关系对实验结果进行了讨论。
任光明何伟
关键词:磁化强度
Mn和Co掺杂ZnO块材样品的磁性被引量:1
2007年
采用固相反应法制备了名义组分为Zn_(0.95)Co_(0.05O)和Zn_(0.92)Co_(0.05)Mn_(0.03O)的块材样品.X射线衍射结果显示,除ZnO纤锌矿结构的主相外,掺杂样品中还存在立方相Co3O4.磁测量表明,ZnO中单独掺杂Co元素显示出微弱的铁磁性行为,Mn的引入极大地增强了样品的铁磁性,但两个样品在低温下(<50K)表现出截然不同的磁化行为.同时,反铁磁相Co3O4的存在极大地抑制了样品中的铁磁性耦合作用.
王永强袁松柳宋运兴刘莉田召明李派周远明李云龙尹诗岩
关键词:磁化强度
(1-x)La_(2/3)Ca_(1/3)MnO_3/xSb_2O_5复合体系的电子输运和磁电阻行为被引量:4
2007年
用两步法制备了(1-x)La2/3Ca1/3MnO3/xSb2O5复合样品.零场下电阻温度关系测量表明,对x<3%范围,随Sb2O5含量增加,复合样品电阻率增大,绝缘体-金属转变温度降低;而对x>3%范围,随Sb2O5含量增加,复合样品电阻率减小,绝缘体-金属转变温度提高.磁电阻测量表明,少量Sb2O5同La2/3Ca1/3MnO3复合,可明显增强磁电阻效应.
袁力缪菊红王永强刘莉袁松柳
关键词:磁电阻
Effects of Pr on the structure and magnetic properties of FePt alloys被引量:3
2007年
The effects of Pr on the structure and magnetic properties of PrxFe60.5-xPt39.5 alloys (x = 0, 0.5, 1.0, and 1.5) were investigated. X-ray diffraction data indicated that the phase transition temperature of FePt based alloys from disordered face-centered-cubic to ordered face-centered-tetragonal cubic decreases with the increase in Pr concentration. Pr plays the role of a grain refiner and it can enhance the exchange coupling between soft magnetic phase and hard magnetic phase. The results indicate that the replacement of Fe by Pr can significantly improve the remanence and coercivity of the Fe60.5Pt39.5 alloy. These results can be explained on the basis of phase transformation and microstructure. Both the remanence ratio and coercivity of the FePt based alloy as a function of the Pr content are increased by the optimum addition of 0.5 at.% Pr.
CHENG GangGU ZhengfeiZGOU HuaiyingCHENG JunYUAN Songliu
Phase Transformation and Magnetic Properties of Nd_xFe_(60.5-x)Pt_(39.5)(x=0, 0.5, 1.0, 1.5) Alloys被引量:1
2007年
The effect of Nd addition on the structure, phase transformation and magnetic properties of FePt based alloys was investigated. The results indicated that the transition temperature from ordered FCT to disordered FCC phase decreased with increasing Nd concentration, but for alloys quenched rapidly from the γ phase region into ice-water, it increased with increasing Nd. The Nd element not only effectively reduced the grain size of the ordered phase but also decreased the degree of the ordered phase and refined the grains of the FCC matrix phase. The remanence ratio and coereivity of the FePt based alloy as a function of the Nd content had maximum values, respectively.
成钢顾正飞周怀营王仲民袁松柳
高温高压下Co掺杂ZnO的压敏特性被引量:2
2010年
利用CS-m-D六面顶压机,对钴掺杂氧化锌Zn1-xCoxO(x=0,0.02,0.05,0.1)纳米粉末样品,在温度为600℃和压力为常压、4 GPa、6 GPa的条件下进行高温高压处理。通过对样品的X射线衍射分析和伏安特性测量,结果表明,高温高压能够有效促进材料晶粒成长,并有效提高样品的压敏特性。同时,实验显示,不同组分的Zn1-xCoxO样品中,x=0.05的样品具有较好的压敏特性。另外,通过分析指出,高温高压下掺杂样品产生的晶界偏析也是提高样品非线性的原因之一。
马争争李建青陈子鹏徐萍
关键词:ZNO低压压敏电阻钴掺杂高温高压
Magnetism in Mn and Co doped ZnO bulk samples被引量:4
2007年
Bulk samples with nominal composition Zn0.95Co0.05O and Zn0.92Co0.05Mn0.03O were fabricated by a solid-state reaction method at 600℃.X-ray diffraction experiment showed that the peaks of secondary phase Co3O4 with a cubic structure were visible in both samples,besides the main peaks of wurtzite structure as ZnO.Magnetization measurement indicated that doping Co alone can induce ferromag- netism in ZnO itself,while the introduction of Mn significantly enhances ferromagnetism.However, both samples showed different magnetic behavior at temperatures below 50 K.It was also noted that ferromagnetic coupling interaction was weakened due to the presence of antiferromagnetic Co3O4.
WANG YongQiang YUAN SongLiu SONG YunXing LIU Li TIAN ZhaoMing LI Pai ZHOU YuanMing LI YunLong YIN ShiYan
关键词:
Electrical and Magnetic Properties of Bilayer Manganites La_(1.4)Sr_(1.6)Mn_(1.96)TE_(0.04)O_7 (TE=Mn, Fe, Ti, Nb)
2007年
The electrical and magnetic properties of bilayer manganites La1.4Sr1.6Mn1.96TE0.04O7(TE = Mn, Fe, Ti, Nb) were investigated. Doping caused obvious changes in electrical and magnetic behaviors such as decrease of insulator-metal transition and magnetic transition temperatures, increase of peak resistivity, and different magnetoresistance effect. These changes had a significant degree of correlation with the valence of doped ions. From Fe, Ti to Nb doping, the effect was doubly stronger. The results could be well understood by considering the different destructions on double-exchange interaction and different influences on lattice distortion caused by Fe, Ti and Nb doping. The temperature dependence of magnetization measured at high field showed that the influence of doping was greatest near three-dimensional magnetic transition temperature of parent phase.
余功奇袁松柳任光明缪菊红肖循王永强
关键词:DOUBLE-EXCHANGEMAGNETORESISTANCE
共1页<1>
聚类工具0