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Gas-phase triggered phase evolution in pressure-less sintered LiF doped Mg-Al spinel.

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Title: Gas-phase triggered phase evolution in pressure-less sintered LiF doped Mg-Al spinel.
Authors: Müller, Mathis M.1 (AUTHOR) mathis_m_mueller@yahoo.de, Stricker, Kerstin1 (AUTHOR), Kleebe, Hans-Joachim1 (AUTHOR)
Source: Journal of the European Ceramic Society. Aug2021, Vol. 41 Issue 10, p5400-5404. 5p.
Subjects: Spinel, Gas phase reactions, Atmospheric pressure, Electron microscopy, X-ray microscopy
Abstract: • LiF is one of the most promising sintering aid to fully densify spinel ceramics. However, the phase evolution is not completely understood. • A number of interactions were postulated, including a wetting de-wetting mechanism and the formation of transient phases like LiAlO2 or MgF2. • The formation of LiAlO2 was shown for the first time by means of electron microscopy in combination with x-ray diffraction methods. • Moreover, the formation of a second generation of Mg-Al spinel was shown to be the result of a recombination of solid LiAlO2 and a gas phase. • Shown results will influence further efforts in this system since a gaseous phase hinders full densification and thus full transparency. Within the studies of the LiF-MgAl 2 O 4 system, a dissolution - reprecipitation process is postulated at high pressure synthesis, involving LiAlO 2 and MgF 2 as transient phases. Heating experiments at atmospheric pressure, combined with a dedicated sample geometry enabled the identification of LiAlO 2 and MgO via XRD and, for the first time, with electron microscopic examinations. Moreover, it is shown that a second generation of spinel precipitates as the result of a gas-phase reaction. The involvement of a gaseous phase is seen as the major reason, why it seems impossible to produce transparent spinel in a pressure-less sintering regime. [ABSTRACT FROM AUTHOR]
Copyright of Journal of the European Ceramic Society 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: 150230081
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Gas-phase triggered phase evolution in pressure-less sintered LiF doped Mg-Al spinel.
– Name: Author
  Label: Authors
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  Data: <searchLink fieldCode="AR" term="%22Müller%2C+Mathis+M%2E%22">Müller, Mathis M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> mathis_m_mueller@yahoo.de</i><br /><searchLink fieldCode="AR" term="%22Stricker%2C+Kerstin%22">Stricker, Kerstin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kleebe%2C+Hans-Joachim%22">Kleebe, Hans-Joachim</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+the+European+Ceramic+Society%22">Journal of the European Ceramic Society</searchLink>. Aug2021, Vol. 41 Issue 10, p5400-5404. 5p.
– Name: Subject
  Label: Subjects
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  Data: <searchLink fieldCode="DE" term="%22Spinel%22">Spinel</searchLink><br /><searchLink fieldCode="DE" term="%22Gas+phase+reactions%22">Gas phase reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Atmospheric+pressure%22">Atmospheric pressure</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+microscopy%22">Electron microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+microscopy%22">X-ray microscopy</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: • LiF is one of the most promising sintering aid to fully densify spinel ceramics. However, the phase evolution is not completely understood. • A number of interactions were postulated, including a wetting de-wetting mechanism and the formation of transient phases like LiAlO2 or MgF2. • The formation of LiAlO2 was shown for the first time by means of electron microscopy in combination with x-ray diffraction methods. • Moreover, the formation of a second generation of Mg-Al spinel was shown to be the result of a recombination of solid LiAlO2 and a gas phase. • Shown results will influence further efforts in this system since a gaseous phase hinders full densification and thus full transparency. Within the studies of the LiF-MgAl 2 O 4 system, a dissolution - reprecipitation process is postulated at high pressure synthesis, involving LiAlO 2 and MgF 2 as transient phases. Heating experiments at atmospheric pressure, combined with a dedicated sample geometry enabled the identification of LiAlO 2 and MgO via XRD and, for the first time, with electron microscopic examinations. Moreover, it is shown that a second generation of spinel precipitates as the result of a gas-phase reaction. The involvement of a gaseous phase is seen as the major reason, why it seems impossible to produce transparent spinel in a pressure-less sintering regime. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of the European Ceramic Society 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.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=150230081
RecordInfo BibRecord:
  BibEntity:
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      – Type: doi
        Value: 10.1016/j.jeurceramsoc.2021.03.059
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 5
        StartPage: 5400
    Subjects:
      – SubjectFull: Spinel
        Type: general
      – SubjectFull: Gas phase reactions
        Type: general
      – SubjectFull: Atmospheric pressure
        Type: general
      – SubjectFull: Electron microscopy
        Type: general
      – SubjectFull: X-ray microscopy
        Type: general
    Titles:
      – TitleFull: Gas-phase triggered phase evolution in pressure-less sintered LiF doped Mg-Al spinel.
        Type: main
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            NameFull: Müller, Mathis M.
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            NameFull: Stricker, Kerstin
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            NameFull: Kleebe, Hans-Joachim
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            – D: 15
              M: 08
              Text: Aug2021
              Type: published
              Y: 2021
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              Value: 41
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              Value: 10
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            – TitleFull: Journal of the European Ceramic Society
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