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Experimental studies of novel magnetic refrigerants by high field X-ray diffraction measurements

Experimental studies of novel magnetic refrigerants by high field X-ray diffraction measurements
高场X射线衍射测量新型磁性制冷剂的实验研究
批准号:
17560610
负责人:
KOYAMA Keiichi
金额:
$2.12万
依托单位:
依托单位国家:
日本
项目类别:
Grant-in-Aid for Scientific Research (C)
财政年份:
2005
资助国家:
日本
项目状态:
已结题
起止时间:
2005 至 2007

项目摘要

项目成果

KOYAMA Keiichi的其他基金

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中文摘要
翻译
在这项工作中,我通过高x射线衍射测量研究了新型磁性制冷剂。我已经澄清了一些主题如下:1。在大磁热材料MnFeP_0.5As_0.5上观察到场致磁性和结构转变。材料具有六角形结构,在磁场作用下参数a和c的变形量分别为0.5%和1.0%。大磁热材料Gd_5(GeFe)Si_2在强磁场作用下由单斜向正交结构转变。在大磁热材料Ni_<50>Mn_<36>Sn_<14>中观察到场致反马氏体相变,由正交结构向立方结构转变。铁磁性形状记忆合金Ni_<50>Mn_<36>Sn_<14>表现出较大的磁阻效应,并伴有场致反向马氏体相变。研究了磁性形状记忆合金Ni_<50>Mn_<36>Sn_<14>在强磁场下的磁性和热电性能。在高磁场作用下,在630 K高温下观察到MnBi的一阶变磁转变。MnBi在一阶磁转变温度下表现出较大的磁热效应。在高磁场作用下,MnBi的一阶磁转变温度以2 KT^<-1>.8的速率升高。DyB_2C_2在10 K以下发生了磁场和压力诱导的磁跃迁。
英文摘要
In this work, I have studied novel magnetic refrigerants by high X-ray diffraction measurements. I have clarified some topics as follows:1. I observed a field-induced magnetic and structural transition on large magnetocaloric material MnFeP_0.5As_0.5. The material has a hexagonal structure and shows that the parameters a and c deform by 0.5% and 1.0%, respectively, by magnetic field.2. Large magnetocaloric material Gd_5(GeFe)Si_2 shows a structural transformation from a monoclinic structure to an orthorhombic structure by high magnetic field.3. I observed a field-induced reverse martensitic transformation from an orthorhombic structure to a cubic structure in large magnetocaloric material Ni_<50>Mn_<36>Sn_<14>.4. The ferromagnetic shape memory alloy Ni_<50>Mn_<36>Sn_<14> shows a large magnetoresistance effect accompanied by the field-induced reverse martensitic transformation.5. I revealed the magnetic and thermoelectric properties of magnetic shape memory alloy Ni_<50>Mn_<36>Sn_<14> in high magnetic fields.6. I observed a metamagnetic (1st-order) transition of MnBi at high temperature of 630 K by high magnetic fields.7. MnBi shows a large magnetocaloric effect at the 1st-order magnetic transition temperature. By applying high magnetic field, the 1st-order magnetic transition temperature of MnBi increases at the rate of 2 KT^<-1>.8. Magnetic field and pressure induced magnetic transitions were observed in DyB_2C_2 below 10 K.
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DOI: --
发表时间: 2005
期刊:
影响因子: --
作者: [K. Koyama, S. Miura, H. Okada, and K. Watanabe]
通讯作者: and K. Watanabe
DOI: --
发表时间: 2006
期刊: Appl. Phys. Lett 88
影响因子: --
作者: [K. Koyama, K. Watanabe, T. Kanomata, R. Kainuma, K. Oikawa, and K. Ishida]
通讯作者: and K. Ishida
X-ray powder diffraction studies of Mn3Ga0.97A10.03C in magnetic fields
Mn3Ga0.97A10.03C在磁场中的X射线粉末衍射研究
DOI: --
发表时间: 2006
期刊: Materials Transaction 47
影响因子: --
作者: [K.Koyama, T.Kanomata, T.Watanabe, T.Suzuki, H.Nishihara, K.Watanabe]
通讯作者: K.Watanabe
High field X-ray diffraction studies on Gd_5(Ge<2-x>Fe_x)Si_2 (x=0.05 and 0.2)
Gd_5(Ge<2-x>Fe_x)Si_2 (x=0.05和0.2)的高场X射线衍射研究
DOI: --
发表时间: 2005
期刊: Mater. Trans. 46
影响因子: --
作者: [K.Koyama, T.Kanomata, T.Watanabe, T.Suzuki, H.Nishihara, K.Watanabe, K. Koyama, J.L. Her]
通讯作者: J.L. Her
59
    Magnetic field induced ferromagnetic stable phase including low melting point metal
    • 批准号:
      16K14374
    • 项目类别:
      Grant-in-Aid for Challenging Exploratory Research
    • 资助金额:
      $2.41万
    • 财政年份:
      2016
    • 负责人:
      KOYAMA Keiichi
    • 依托单位:
    The study on equilibrium phase diagram under magnetic fields and preparation of ferromagnetic materials by magnetic field-induced reaction effects
    • 批准号:
      16H04547
    • 项目类别:
      Grant-in-Aid for Scientific Research (B)
    • 资助金额:
      $11.4万
    • 财政年份:
      2016
    • 负责人:
      KOYAMA Keiichi
    • 依托单位:
    The study on phase diagram of magnetic materials and alloys under high magnetic fields for development of new functional materials
    • 批准号:
      22360285
    • 项目类别:
      Grant-in-Aid for Scientific Research (B)
    • 资助金额:
      $11.81万
    • 财政年份:
      2010
    • 负责人:
      KOYAMA Keiichi
    • 依托单位:
    Behavior and Function of Obligate and Facultative Microorganisms.
    • 批准号:
      63302050
    • 项目类别:
      Grant-in-Aid for Co-operative Research (A)
    • 资助金额:
      $9.02万
    • 财政年份:
      1988
    • 负责人:
      KOYAMA Keiichi
    • 依托单位:
    海外基金