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Giant Negative Thermal Expansion in Bonded MnCoGe-Based Compounds with Ni2ln-Type Hexagonal Structure.

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Title: Giant Negative Thermal Expansion in Bonded MnCoGe-Based Compounds with Ni2ln-Type Hexagonal Structure.
Authors: Ying-Ying Zhao1, Feng-Xia Hu1 fxh@)iphy.ac.cn, Li-Fu Bao1, Jing Wang1 wangjing@iphy.ac.cn, Hui Wu2,3, Qing-Zhen Huang2, Rong-Rong Wu1, Yao Liu1, Fei-Ran Shen1, Hao Kuang1, Ming Zhang1, Wen-Liang Zuo1, Xin-Qi Zheng1, Ji-Rong Sun1, Bao-Gen Shen1
Source: Journal of the American Chemical Society. 2/11/2015, Vol. 137 Issue 5, p1746-1749. 4p.
Subjects: Thermal expansion, Manganese compounds, Martensitic structure, Martensitic transformations, High resolution spectroscopy, Neutron diffraction, Magnetocaloric effects
Abstract: MnCoGe-based compounds undergo a giant negative thermal expansion (NTE) during the martensitic structural transition from Ni2In-type hexagonal to TiNiSi-type orthorhombic structure. High-resolution neutron diffraction experiments revealed that the expansion of unit cell volume can be as large as ΔV/V ~ 3.9%. The optimized compositions with concurrent magnetic and structural transitions have been studied for magnetocaloric effect. However, these materials have not been considered as NTE materials partially due to the limited temperature window of phase transition. The as-prepared MnCoGe-based compounds are quite brittle and naturally collapse into powders. By using a few percents (3-4%) of epoxy to bond the powders, we introduced residual stress in the bonded samples and thus realized the broadening of structural transition by utilizing the specific characteristics of lattice softening enforced by the stress. As a result, giant NTE (not only the linear NTE coefficient α but also the operation-temperature window) has been achieved. For example, the average .. as much as -51.5 x 10(-6)/K with an operating temperature window as wide as 210 K from 122 to 332 K has been observed in a bonded MnCo0.98Cr0.02Ge compound. Moreover, in the region between 250 and 305 K near room temperature, the α value (-119 x 10-6/K) remains nearly independent of temperature. Such an excellent performance exceeds that of most other materials reported previously, suggesting it can potentially be used as a NTE material, particularly for compensating the materials with large positive thermal expansions. [ABSTRACT FROM AUTHOR]
Copyright of Journal of the American Chemical Society is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Giant Negative Thermal Expansion in Bonded MnCoGe-Based Compounds with Ni<subscript>2</subscript>ln-Type Hexagonal Structure.
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  Data: <searchLink fieldCode="AR" term="%22Ying-Ying+Zhao%22">Ying-Ying Zhao</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Feng-Xia+Hu%22">Feng-Xia Hu</searchLink><relatesTo>1</relatesTo><i> fxh@)iphy.ac.cn</i><br /><searchLink fieldCode="AR" term="%22Li-Fu+Bao%22">Li-Fu Bao</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Jing+Wang%22">Jing Wang</searchLink><relatesTo>1</relatesTo><i> wangjing@iphy.ac.cn</i><br /><searchLink fieldCode="AR" term="%22Hui+Wu%22">Hui Wu</searchLink><relatesTo>2,3</relatesTo><br /><searchLink fieldCode="AR" term="%22Qing-Zhen+Huang%22">Qing-Zhen Huang</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Rong-Rong+Wu%22">Rong-Rong Wu</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Yao+Liu%22">Yao Liu</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Fei-Ran+Shen%22">Fei-Ran Shen</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Hao+Kuang%22">Hao Kuang</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ming+Zhang%22">Ming Zhang</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Wen-Liang+Zuo%22">Wen-Liang Zuo</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Xin-Qi+Zheng%22">Xin-Qi Zheng</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ji-Rong+Sun%22">Ji-Rong Sun</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Bao-Gen+Shen%22">Bao-Gen Shen</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+the+American+Chemical+Society%22">Journal of the American Chemical Society</searchLink>. 2/11/2015, Vol. 137 Issue 5, p1746-1749. 4p.
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  Data: <searchLink fieldCode="DE" term="%22Thermal+expansion%22">Thermal expansion</searchLink><br /><searchLink fieldCode="DE" term="%22Manganese+compounds%22">Manganese compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Martensitic+structure%22">Martensitic structure</searchLink><br /><searchLink fieldCode="DE" term="%22Martensitic+transformations%22">Martensitic transformations</searchLink><br /><searchLink fieldCode="DE" term="%22High+resolution+spectroscopy%22">High resolution spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Neutron+diffraction%22">Neutron diffraction</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetocaloric+effects%22">Magnetocaloric effects</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: MnCoGe-based compounds undergo a giant negative thermal expansion (NTE) during the martensitic structural transition from Ni2In-type hexagonal to TiNiSi-type orthorhombic structure. High-resolution neutron diffraction experiments revealed that the expansion of unit cell volume can be as large as ΔV/V ~ 3.9%. The optimized compositions with concurrent magnetic and structural transitions have been studied for magnetocaloric effect. However, these materials have not been considered as NTE materials partially due to the limited temperature window of phase transition. The as-prepared MnCoGe-based compounds are quite brittle and naturally collapse into powders. By using a few percents (3-4%) of epoxy to bond the powders, we introduced residual stress in the bonded samples and thus realized the broadening of structural transition by utilizing the specific characteristics of lattice softening enforced by the stress. As a result, giant NTE (not only the linear NTE coefficient α but also the operation-temperature window) has been achieved. For example, the average .. as much as -51.5 x 10(-6)/K with an operating temperature window as wide as 210 K from 122 to 332 K has been observed in a bonded MnCo0.98Cr0.02Ge compound. Moreover, in the region between 250 and 305 K near room temperature, the α value (-119 x 10-6/K) remains nearly independent of temperature. Such an excellent performance exceeds that of most other materials reported previously, suggesting it can potentially be used as a NTE material, particularly for compensating the materials with large positive thermal expansions. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of the American Chemical Society is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1021/ja510693a
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 4
        StartPage: 1746
    Subjects:
      – SubjectFull: Thermal expansion
        Type: general
      – SubjectFull: Manganese compounds
        Type: general
      – SubjectFull: Martensitic structure
        Type: general
      – SubjectFull: Martensitic transformations
        Type: general
      – SubjectFull: High resolution spectroscopy
        Type: general
      – SubjectFull: Neutron diffraction
        Type: general
      – SubjectFull: Magnetocaloric effects
        Type: general
    Titles:
      – TitleFull: Giant Negative Thermal Expansion in Bonded MnCoGe-Based Compounds with Ni2ln-Type Hexagonal Structure.
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            – D: 11
              M: 02
              Text: 2/11/2015
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              Y: 2015
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