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ATL>Valency changes of ytterbium in YbMnGe and in the YbMnSi1−xGex pseudo-ternary system.

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Title: ATL>Valency changes of ytterbium in YbMnGe and in the YbMnSi1−xGex pseudo-ternary system.
Authors: Fornasini, M.L., Merlo, F. cfmet@chimica.unige.it, Palenzona, A., Pani, M.
Source: Journal of Alloys & Compounds. Mar2002, Vol. 335 Issue 1/2, p120. 6p.
Subjects: Crystallography, Ytterbium, X-ray diffraction
Abstract: X-Ray diffraction on powders and single crystals has been used to study some phases in the YbMnSi1−xGex system. YbMnGe is dimorphic: the high-temperature form, stable above 1423 K, crystallizes in the hexagonal ZrNiAl-type structure, while the low-temperature form, stable below 1073 K, is orthorhombic with TiNiSi-type. The structural transition is accompanied, and probably caused, by a valence change of the ytterbium atoms, from trivalency (in the HT form) to divalency (in the LT form). The corresponding large volume increase is the cause of the observed explosive nature of the transition. The same valence transition, even if at lower temperatures, occurs also in some phases on the germanium side of the YbMnSi1−xGex system (for x=0.8, 0.9, 0.95, 0.975), but both HT and LT forms are TiNiSi-type, showing sharply different cell volumes. No transition was observed in YbMnSi and YbMnSi0.5Ge0.5, which crystallize in the TiNiSi structure and probably contain trivalent ytterbium atoms. [Copyright &y& Elsevier]
Copyright of Journal of Alloys & Compounds is the property of Elsevier B.V. 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.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 7757687
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
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  Data: ATL>Valency changes of ytterbium in YbMnGe and in the YbMnSi<subscript>1−x</subscript>Ge<subscript>x</subscript> pseudo-ternary system.
– Name: Author
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  Data: <searchLink fieldCode="AR" term="%22Fornasini%2C+M%2EL%2E%22">Fornasini, M.L.</searchLink><br /><searchLink fieldCode="AR" term="%22Merlo%2C+F%2E%22">Merlo, F.</searchLink><i> cfmet@chimica.unige.it</i><br /><searchLink fieldCode="AR" term="%22Palenzona%2C+A%2E%22">Palenzona, A.</searchLink><br /><searchLink fieldCode="AR" term="%22Pani%2C+M%2E%22">Pani, M.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Alloys+%26+Compounds%22">Journal of Alloys & Compounds</searchLink>. Mar2002, Vol. 335 Issue 1/2, p120. 6p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Crystallography%22">Crystallography</searchLink><br /><searchLink fieldCode="DE" term="%22Ytterbium%22">Ytterbium</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+diffraction%22">X-ray diffraction</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: X-Ray diffraction on powders and single crystals has been used to study some phases in the YbMnSi1−xGex system. YbMnGe is dimorphic: the high-temperature form, stable above 1423 K, crystallizes in the hexagonal ZrNiAl-type structure, while the low-temperature form, stable below 1073 K, is orthorhombic with TiNiSi-type. The structural transition is accompanied, and probably caused, by a valence change of the ytterbium atoms, from trivalency (in the HT form) to divalency (in the LT form). The corresponding large volume increase is the cause of the observed explosive nature of the transition. The same valence transition, even if at lower temperatures, occurs also in some phases on the germanium side of the YbMnSi1−xGex system (for x=0.8, 0.9, 0.95, 0.975), but both HT and LT forms are TiNiSi-type, showing sharply different cell volumes. No transition was observed in YbMnSi and YbMnSi0.5Ge0.5, which crystallize in the TiNiSi structure and probably contain trivalent ytterbium atoms. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Alloys & Compounds is the property of Elsevier B.V. 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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      – Type: doi
        Value: 10.1016/S0925-8388(01)01825-4
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 6
        StartPage: 120
    Subjects:
      – SubjectFull: Crystallography
        Type: general
      – SubjectFull: Ytterbium
        Type: general
      – SubjectFull: X-ray diffraction
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    Titles:
      – TitleFull: ATL>Valency changes of ytterbium in YbMnGe and in the YbMnSi1−xGex pseudo-ternary system.
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            NameFull: Fornasini, M.L.
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            NameFull: Merlo, F.
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            NameFull: Palenzona, A.
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            NameFull: Pani, M.
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            – D: 14
              M: 03
              Text: Mar2002
              Type: published
              Y: 2002
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              Value: 335
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              Value: 1/2
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            – TitleFull: Journal of Alloys & Compounds
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