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Phase stability and cation partitioning in compositionally complex rare earth aluminates and aluminate‐zirconate mixtures.

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Title: Phase stability and cation partitioning in compositionally complex rare earth aluminates and aluminate‐zirconate mixtures.
Authors: Yu, Yueh‐Cheng1 (AUTHOR), Nachlas, William O.2 (AUTHOR), Poerschke, David L.1 (AUTHOR) dpoersch@umn.edu
Source: Journal of the American Ceramic Society. Mar2024, Vol. 107 Issue 3, p1760-1775. 16p.
Subjects: Aluminates, Rare earth oxides, Mixtures, Cations, Phase partition, Zirconates
Abstract: Multicomponent oxides have received significant recent attention due to their potential for improved property tunability. In simple structures, compositionally complex oxides can be stabilized by increased configurational entropy and are sometimes called "high entropy" ceramics. In phases with multiple cation sublattices or complex stoichiometries, it is more difficult to achieve high configurational entropy. However, there is limited knowledge about the factors influencing stability and solubility limits in many systems. This study investigated the limits on the stability of rare earth (RE) aluminates containing mixtures of RE cations including Gd, La, Nd, Yb, and Y in cases where (i) a fixed RE:Al ratio attempts to constrain the material into a single‐phase aluminate or (ii) a two‐phase aluminate, and in equilibrium with RE zirconates that readily dissolve multiple RE3+. The results show that it is difficult to form single‐phase, equimolar mixed‐RE aluminates encompassing a range of RE3+ sizes. Instead, the RE3+ selectively partition into specific phases based on RE‐size trends in the constituent binary systems. The results are discussed in terms of the phase stability and cation partition trends and potential applications. [ABSTRACT FROM AUTHOR]
Copyright of Journal of the American Ceramic Society is the property of Wiley-Blackwell 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: Phase stability and cation partitioning in compositionally complex rare earth aluminates and aluminate‐zirconate mixtures.
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  Data: <searchLink fieldCode="AR" term="%22Yu%2C+Yueh‐Cheng%22">Yu, Yueh‐Cheng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nachlas%2C+William+O%2E%22">Nachlas, William O.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Poerschke%2C+David+L%2E%22">Poerschke, David L.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> dpoersch@umn.edu</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+the+American+Ceramic+Society%22">Journal of the American Ceramic Society</searchLink>. Mar2024, Vol. 107 Issue 3, p1760-1775. 16p.
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  Data: <searchLink fieldCode="DE" term="%22Aluminates%22">Aluminates</searchLink><br /><searchLink fieldCode="DE" term="%22Rare+earth+oxides%22">Rare earth oxides</searchLink><br /><searchLink fieldCode="DE" term="%22Mixtures%22">Mixtures</searchLink><br /><searchLink fieldCode="DE" term="%22Cations%22">Cations</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+partition%22">Phase partition</searchLink><br /><searchLink fieldCode="DE" term="%22Zirconates%22">Zirconates</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Multicomponent oxides have received significant recent attention due to their potential for improved property tunability. In simple structures, compositionally complex oxides can be stabilized by increased configurational entropy and are sometimes called "high entropy" ceramics. In phases with multiple cation sublattices or complex stoichiometries, it is more difficult to achieve high configurational entropy. However, there is limited knowledge about the factors influencing stability and solubility limits in many systems. This study investigated the limits on the stability of rare earth (RE) aluminates containing mixtures of RE cations including Gd, La, Nd, Yb, and Y in cases where (i) a fixed RE:Al ratio attempts to constrain the material into a single‐phase aluminate or (ii) a two‐phase aluminate, and in equilibrium with RE zirconates that readily dissolve multiple RE3+. The results show that it is difficult to form single‐phase, equimolar mixed‐RE aluminates encompassing a range of RE3+ sizes. Instead, the RE3+ selectively partition into specific phases based on RE‐size trends in the constituent binary systems. The results are discussed in terms of the phase stability and cation partition trends and potential applications. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of the American Ceramic Society is the property of Wiley-Blackwell 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: 10.1111/jace.19375
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 16
        StartPage: 1760
    Subjects:
      – SubjectFull: Aluminates
        Type: general
      – SubjectFull: Rare earth oxides
        Type: general
      – SubjectFull: Mixtures
        Type: general
      – SubjectFull: Cations
        Type: general
      – SubjectFull: Phase partition
        Type: general
      – SubjectFull: Zirconates
        Type: general
    Titles:
      – TitleFull: Phase stability and cation partitioning in compositionally complex rare earth aluminates and aluminate‐zirconate mixtures.
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            NameFull: Yu, Yueh‐Cheng
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            NameFull: Nachlas, William O.
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            NameFull: Poerschke, David L.
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          Dates:
            – D: 01
              M: 03
              Text: Mar2024
              Type: published
              Y: 2024
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              Value: 107
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            – TitleFull: Journal of the American Ceramic Society
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