View in EDS HTML Full Text PDF Full Text

Engineering superparamagnetic quantum-sized Ca2+-doped CoFe₂O₄ nanomaterials.

Saved in:
Bibliographic Details
Title: Engineering superparamagnetic quantum-sized Ca2+-doped CoFe₂O₄ nanomaterials.
Authors: Anchal1 (AUTHOR), Sarita1 (AUTHOR), Choudhary, Yashpal1 (AUTHOR), Jakhar, Narendra2 (AUTHOR), Alvi, P. A1 (AUTHOR), Choudhary, B. L.1 (AUTHOR) blcphysics@gmail.com
Source: Materials Research Innovations. Nov2025, Vol. 29 Issue 7, p512-534. 23p.
Subjects: Superparamagnetic materials, Nanoparticles, Sol-gel processes, Cobalt oxides, X-ray diffraction, Magnetic measurements, Calcium compounds, Quantum dots
Abstract: This study reports the synthesis of superparamagnetic CaxCo1-xFe2O4 nanoparticles (x = 0.1, 0.3, 0.5) via the sol-gel method using citric acid as a chelating agent. XRD and Rietveld refinement confirmed a cubic crystal structure (Fd-3m), with crystallite size decreasing from 5.8 to 5 nm as Ca2+ concentration increased, placing them in the quantum dot regime. Williamson-Hall analysis assessed micro-strain, while FESEM revealed predominantly spherical nanoparticles. Raman and FTIR spectra confirmed key vibrational modes and characteristic bonds. UV–Vis. spectroscopy showed a decreasing optical bandgap and increasing Urbach energy with higher Ca2+ levels, supported by PL analysis. XPS provided insight into elemental oxidation states. Magnetic measurements via VSM exhibited low remanence and coercivity, along with a squareness ratio exceeding 0.5, confirming their superparamagnetic behavior. ${\rm{C}}{{\rm{a}}_{\rm{x}}}{\rm{C}}{{\rm{o}}_{1 - {\rm{x}}}}{\rm{F}}{{\rm{e}}_2}{{\rm{O}}_4}$ C a x C o 1 − x F e 2 O 4 [ABSTRACT FROM AUTHOR]
Copyright of Materials Research Innovations is the property of Taylor & Francis Ltd 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
Full text is not displayed to guests.
FullText Links:
  – Type: pdflink
Text:
  Availability: 1
Header DbId: egs
DbLabel: Engineering Source
An: 188875713
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Engineering superparamagnetic quantum-sized Ca<superscript>2+</superscript>-doped CoFe₂O₄ nanomaterials.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Anchal%22">Anchal</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sarita%22">Sarita</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Choudhary%2C+Yashpal%22">Choudhary, Yashpal</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jakhar%2C+Narendra%22">Jakhar, Narendra</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Alvi%2C+P%2E+A%22">Alvi, P. A</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Choudhary%2C+B%2E+L%2E%22">Choudhary, B. L.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> blcphysics@gmail.com</i>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Materials+Research+Innovations%22">Materials Research Innovations</searchLink>. Nov2025, Vol. 29 Issue 7, p512-534. 23p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Superparamagnetic+materials%22">Superparamagnetic materials</searchLink><br /><searchLink fieldCode="DE" term="%22Nanoparticles%22">Nanoparticles</searchLink><br /><searchLink fieldCode="DE" term="%22Sol-gel+processes%22">Sol-gel processes</searchLink><br /><searchLink fieldCode="DE" term="%22Cobalt+oxides%22">Cobalt oxides</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+diffraction%22">X-ray diffraction</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+measurements%22">Magnetic measurements</searchLink><br /><searchLink fieldCode="DE" term="%22Calcium+compounds%22">Calcium compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Quantum+dots%22">Quantum dots</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This study reports the synthesis of superparamagnetic CaxCo1-xFe2O4 nanoparticles (x = 0.1, 0.3, 0.5) via the sol-gel method using citric acid as a chelating agent. XRD and Rietveld refinement confirmed a cubic crystal structure (Fd-3m), with crystallite size decreasing from 5.8 to 5 nm as Ca2+ concentration increased, placing them in the quantum dot regime. Williamson-Hall analysis assessed micro-strain, while FESEM revealed predominantly spherical nanoparticles. Raman and FTIR spectra confirmed key vibrational modes and characteristic bonds. UV–Vis. spectroscopy showed a decreasing optical bandgap and increasing Urbach energy with higher Ca2+ levels, supported by PL analysis. XPS provided insight into elemental oxidation states. Magnetic measurements via VSM exhibited low remanence and coercivity, along with a squareness ratio exceeding 0.5, confirming their superparamagnetic behavior. ${\rm{C}}{{\rm{a}}_{\rm{x}}}{\rm{C}}{{\rm{o}}_{1 - {\rm{x}}}}{\rm{F}}{{\rm{e}}_2}{{\rm{O}}_4}$ C a x C o 1 − x F e 2 O 4 [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Materials Research Innovations is the property of Taylor & Francis Ltd 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=188875713
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1080/14328917.2025.2507047
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 23
        StartPage: 512
    Subjects:
      – SubjectFull: Superparamagnetic materials
        Type: general
      – SubjectFull: Nanoparticles
        Type: general
      – SubjectFull: Sol-gel processes
        Type: general
      – SubjectFull: Cobalt oxides
        Type: general
      – SubjectFull: X-ray diffraction
        Type: general
      – SubjectFull: Magnetic measurements
        Type: general
      – SubjectFull: Calcium compounds
        Type: general
      – SubjectFull: Quantum dots
        Type: general
    Titles:
      – TitleFull: Engineering superparamagnetic quantum-sized Ca2+-doped CoFe₂O₄ nanomaterials.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Anchal
      – PersonEntity:
          Name:
            NameFull: Sarita
      – PersonEntity:
          Name:
            NameFull: Choudhary, Yashpal
      – PersonEntity:
          Name:
            NameFull: Jakhar, Narendra
      – PersonEntity:
          Name:
            NameFull: Alvi, P. A
      – PersonEntity:
          Name:
            NameFull: Choudhary, B. L.
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 11
              Text: Nov2025
              Type: published
              Y: 2025
          Identifiers:
            – Type: issn-print
              Value: 14328917
          Numbering:
            – Type: volume
              Value: 29
            – Type: issue
              Value: 7
          Titles:
            – TitleFull: Materials Research Innovations
              Type: main
ResultId 1