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Dislocation‐induced local symmetry reduction in single‐crystal KNbO3 observed by Raman spectroscopy.

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Title: Dislocation‐induced local symmetry reduction in single‐crystal KNbO3 observed by Raman spectroscopy.
Authors: Drechsler, Felix1 (AUTHOR) Felix.Drechsler@physik.tu-freiberg.de, Himcinschi, Cameliu1 (AUTHOR), Preuß, Oliver2 (AUTHOR), Fang, Xufei3 (AUTHOR), Kortus, Jens1 (AUTHOR)
Source: Journal of the American Ceramic Society. Jun2025, Vol. 108 Issue 6, p1-10. 10p.
Subjects: Crystal symmetry, Dislocation structure, Electric conductivity, Single crystals, Superconductivity
Abstract: In recent years, dislocation‐tuned functionalized ceramics have become one of the focal points of modern materials research due to their outstanding properties. These range from improved electrical conductivity and ferroelectric properties to dislocation‐enhanced toughening and superconductivity, caused by local strain fields. The aim of this work is to investigate the dislocation‐induced structural changes in single‐crystal KNbO3 by micro‐Raman spectroscopy. Dislocation‐rich regions with tailored densities have been generated using the Brinell indenter scratching method. The influence of the dislocations on the single‐crystal structure can be observed in the Raman spectra. The activation of additional Raman modes is observed, which does not occur in regions of low dislocation density. This observation is confirmed by DFT calculations of vibrational modes and is attributed to a reduction in the crystal symmetry due to increased defect densities in plastically deformed KNbO3. In addition, an increase in compressive stress at higher dislocation densities can be demonstrated by a blueshift in Raman mode positions. [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: Dislocation‐induced local symmetry reduction in single‐crystal KNbO<subscript>3</subscript> observed by Raman spectroscopy.
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  Data: <searchLink fieldCode="AR" term="%22Drechsler%2C+Felix%22">Drechsler, Felix</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Felix.Drechsler@physik.tu-freiberg.de</i><br /><searchLink fieldCode="AR" term="%22Himcinschi%2C+Cameliu%22">Himcinschi, Cameliu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Preuß%2C+Oliver%22">Preuß, Oliver</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fang%2C+Xufei%22">Fang, Xufei</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kortus%2C+Jens%22">Kortus, Jens</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+the+American+Ceramic+Society%22">Journal of the American Ceramic Society</searchLink>. Jun2025, Vol. 108 Issue 6, p1-10. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Crystal+symmetry%22">Crystal symmetry</searchLink><br /><searchLink fieldCode="DE" term="%22Dislocation+structure%22">Dislocation structure</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+conductivity%22">Electric conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Single+crystals%22">Single crystals</searchLink><br /><searchLink fieldCode="DE" term="%22Superconductivity%22">Superconductivity</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: In recent years, dislocation‐tuned functionalized ceramics have become one of the focal points of modern materials research due to their outstanding properties. These range from improved electrical conductivity and ferroelectric properties to dislocation‐enhanced toughening and superconductivity, caused by local strain fields. The aim of this work is to investigate the dislocation‐induced structural changes in single‐crystal KNbO3 by micro‐Raman spectroscopy. Dislocation‐rich regions with tailored densities have been generated using the Brinell indenter scratching method. The influence of the dislocations on the single‐crystal structure can be observed in the Raman spectra. The activation of additional Raman modes is observed, which does not occur in regions of low dislocation density. This observation is confirmed by DFT calculations of vibrational modes and is attributed to a reduction in the crystal symmetry due to increased defect densities in plastically deformed KNbO3. In addition, an increase in compressive stress at higher dislocation densities can be demonstrated by a blueshift in Raman mode positions. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  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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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1111/jace.20221
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      – Code: eng
        Text: English
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        PageCount: 10
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    Subjects:
      – SubjectFull: Crystal symmetry
        Type: general
      – SubjectFull: Dislocation structure
        Type: general
      – SubjectFull: Electric conductivity
        Type: general
      – SubjectFull: Single crystals
        Type: general
      – SubjectFull: Superconductivity
        Type: general
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      – TitleFull: Dislocation‐induced local symmetry reduction in single‐crystal KNbO3 observed by Raman spectroscopy.
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            NameFull: Drechsler, Felix
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            NameFull: Himcinschi, Cameliu
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            NameFull: Preuß, Oliver
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            NameFull: Fang, Xufei
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            NameFull: Kortus, Jens
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            – D: 01
              M: 06
              Text: Jun2025
              Type: published
              Y: 2025
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