View in EDS

Cation substitution–induced structural disorder in titanate pyrochlores: A multi-spectroscopic study.

Saved in:
Bibliographic Details
Title: Cation substitution–induced structural disorder in titanate pyrochlores: A multi-spectroscopic study.
Authors: Esfahani, Maryam Hasanzadeh1 (AUTHOR), Naji, Hojjat2 (AUTHOR), Greedan, John3 (AUTHOR), Behzad, Mahdi1 (AUTHOR) mahdibehzad@gmail.com
Source: Ceramics International. Jul2026, Vol. 52 Issue 17, p31928-31935. 8p.
Subjects: Pyrochlore, Crystal lattices, Spectrum analysis, Rare earth oxides, X-ray diffraction, Raman spectroscopy, Metal ions, Crystal structure
Abstract: Rare-earth titanate pyrochlores are known for their structural sensitivity to A-site cation composition, where even subtle changes in stoichiometry can influence lattice parameters and local structural ordering. In this work, we investigated the effect of slight compositional variation in Dy x Sm 2-x Ti 2 O 7 (x = 0.6–1.4) pyrochlores to assess how small changes in A-site occupancy affect the overall crystal structure. High-purity ceramics were synthesized via a modified solid-state reaction route. The structural and microstructural characteristics were examined using X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, and scanning electron microscopy (SEM). XRD analysis confirmed the formation of the pyrochlore phase across the studied composition range, accompanied by systematic but subtle shifts in diffraction peak positions and a gradual decrease in lattice parameters with increasing Dy3+ content, consistent with lattice contraction induced by ionic size mismatch. In contrast, Raman and FT-IR spectra exhibited only minor variations, indicating that local vibrational features were less sensitive to such slight compositional changes. SEM observations revealed modest microstructural evolution with composition. Overall, the results demonstrated that even small variations in A-site cation composition could measurably influence the crystal lattice of pyrochlore titanates, primarily reflected in long-range structural parameters rather than pronounced changes in local vibrational spectra. [ABSTRACT FROM AUTHOR]
Copyright of Ceramics International 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
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 194635185
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Cation substitution–induced structural disorder in titanate pyrochlores: A multi-spectroscopic study.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Esfahani%2C+Maryam+Hasanzadeh%22">Esfahani, Maryam Hasanzadeh</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Naji%2C+Hojjat%22">Naji, Hojjat</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Greedan%2C+John%22">Greedan, John</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Behzad%2C+Mahdi%22">Behzad, Mahdi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> mahdibehzad@gmail.com</i>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Ceramics+International%22">Ceramics International</searchLink>. Jul2026, Vol. 52 Issue 17, p31928-31935. 8p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Pyrochlore%22">Pyrochlore</searchLink><br /><searchLink fieldCode="DE" term="%22Crystal+lattices%22">Crystal lattices</searchLink><br /><searchLink fieldCode="DE" term="%22Spectrum+analysis%22">Spectrum analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Rare+earth+oxides%22">Rare earth oxides</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+diffraction%22">X-ray diffraction</searchLink><br /><searchLink fieldCode="DE" term="%22Raman+spectroscopy%22">Raman spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Metal+ions%22">Metal ions</searchLink><br /><searchLink fieldCode="DE" term="%22Crystal+structure%22">Crystal structure</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Rare-earth titanate pyrochlores are known for their structural sensitivity to A-site cation composition, where even subtle changes in stoichiometry can influence lattice parameters and local structural ordering. In this work, we investigated the effect of slight compositional variation in Dy x Sm 2-x Ti 2 O 7 (x = 0.6–1.4) pyrochlores to assess how small changes in A-site occupancy affect the overall crystal structure. High-purity ceramics were synthesized via a modified solid-state reaction route. The structural and microstructural characteristics were examined using X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, and scanning electron microscopy (SEM). XRD analysis confirmed the formation of the pyrochlore phase across the studied composition range, accompanied by systematic but subtle shifts in diffraction peak positions and a gradual decrease in lattice parameters with increasing Dy3+ content, consistent with lattice contraction induced by ionic size mismatch. In contrast, Raman and FT-IR spectra exhibited only minor variations, indicating that local vibrational features were less sensitive to such slight compositional changes. SEM observations revealed modest microstructural evolution with composition. Overall, the results demonstrated that even small variations in A-site cation composition could measurably influence the crystal lattice of pyrochlore titanates, primarily reflected in long-range structural parameters rather than pronounced changes in local vibrational spectra. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Ceramics International 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=194635185
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.ceramint.2026.05.235
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 8
        StartPage: 31928
    Subjects:
      – SubjectFull: Pyrochlore
        Type: general
      – SubjectFull: Crystal lattices
        Type: general
      – SubjectFull: Spectrum analysis
        Type: general
      – SubjectFull: Rare earth oxides
        Type: general
      – SubjectFull: X-ray diffraction
        Type: general
      – SubjectFull: Raman spectroscopy
        Type: general
      – SubjectFull: Metal ions
        Type: general
      – SubjectFull: Crystal structure
        Type: general
    Titles:
      – TitleFull: Cation substitution–induced structural disorder in titanate pyrochlores: A multi-spectroscopic study.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Esfahani, Maryam Hasanzadeh
      – PersonEntity:
          Name:
            NameFull: Naji, Hojjat
      – PersonEntity:
          Name:
            NameFull: Greedan, John
      – PersonEntity:
          Name:
            NameFull: Behzad, Mahdi
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 05
              M: 07
              Text: Jul2026
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-print
              Value: 02728842
          Numbering:
            – Type: volume
              Value: 52
            – Type: issue
              Value: 17
          Titles:
            – TitleFull: Ceramics International
              Type: main
ResultId 1