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Influence of Ni–Cr substitution on structural, magnetic, and optical properties of nanoferrites.

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Title: Influence of Ni–Cr substitution on structural, magnetic, and optical properties of nanoferrites.
Authors: Beniwal, Ravikant1 (AUTHOR), Anchal1 (AUTHOR), Choudhary, Shobha Ram1 (AUTHOR), Yadav, Pooja1 (AUTHOR), Choudhary, Yashpal1 (AUTHOR), Rundla, Avinash2 (AUTHOR), Singh, Kedar2 (AUTHOR), Alvi, P. A.1 (AUTHOR), Choudhary, B. L.1 (AUTHOR) blcphysics@gmail.com
Source: Materials Research Innovations. Jun2026, Vol. 30 Issue 4, p429-450. 22p.
Subjects: Magnetic properties, Optical properties, Magnetism, Magnetic nanoparticles, Ferromagnetism, Crystal structure
Abstract: Polycrystalline NixCr1-xFe2O4 (x = 0.1–0.9) nanoferrites were synthesised via the sol – gel method. The XRD and Rietveld refinement confirmed a stable single-phase cubic spinel structure. FTIR and Raman spectroscopy further validated the spinel phase and revealed local structural distortions associated with cation redistribution. Magnetic measurements demonstrated that size reduction and cation substitution strongly influence spin interactions, leading to tunable transitions between ferromagnetic and superparamagnetic regimes. The intermediate composition Cr0.7Ni0.3Fe2O4 exhibited pronounced low-temperature ferromagnetism, while showing superparamagnetic-like behaviour near room temperature an attribute useful for temperature-responsive magnetic devices. Optical analysis using UV – Vis spectroscopy showed strong UV absorption and adjustable band gaps (1.57–1.66 eV), governed by particle size and cation arrangement. Overall, the study establishes clear structure – property relationships in Ni – Cr ferrite nanoparticles, demonstrating how controlled substitution and nanostructuring can be used to engineer materials tailored for magnetic storage, spintronic technologies, and photocatalytic systems. [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.)
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  Data: Influence of Ni–Cr substitution on structural, magnetic, and optical properties of nanoferrites.
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  Data: <searchLink fieldCode="AR" term="%22Beniwal%2C+Ravikant%22">Beniwal, Ravikant</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Anchal%22">Anchal</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Choudhary%2C+Shobha+Ram%22">Choudhary, Shobha Ram</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yadav%2C+Pooja%22">Yadav, Pooja</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="%22Rundla%2C+Avinash%22">Rundla, Avinash</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Singh%2C+Kedar%22">Singh, Kedar</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Alvi%2C+P%2E+A%2E%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>
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  Data: <searchLink fieldCode="JN" term="%22Materials+Research+Innovations%22">Materials Research Innovations</searchLink>. Jun2026, Vol. 30 Issue 4, p429-450. 22p.
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  Data: <searchLink fieldCode="DE" term="%22Magnetic+properties%22">Magnetic properties</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+properties%22">Optical properties</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetism%22">Magnetism</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+nanoparticles%22">Magnetic nanoparticles</searchLink><br /><searchLink fieldCode="DE" term="%22Ferromagnetism%22">Ferromagnetism</searchLink><br /><searchLink fieldCode="DE" term="%22Crystal+structure%22">Crystal structure</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Polycrystalline NixCr1-xFe2O4 (x = 0.1–0.9) nanoferrites were synthesised via the sol – gel method. The XRD and Rietveld refinement confirmed a stable single-phase cubic spinel structure. FTIR and Raman spectroscopy further validated the spinel phase and revealed local structural distortions associated with cation redistribution. Magnetic measurements demonstrated that size reduction and cation substitution strongly influence spin interactions, leading to tunable transitions between ferromagnetic and superparamagnetic regimes. The intermediate composition Cr0.7Ni0.3Fe2O4 exhibited pronounced low-temperature ferromagnetism, while showing superparamagnetic-like behaviour near room temperature an attribute useful for temperature-responsive magnetic devices. Optical analysis using UV – Vis spectroscopy showed strong UV absorption and adjustable band gaps (1.57–1.66 eV), governed by particle size and cation arrangement. Overall, the study establishes clear structure – property relationships in Ni – Cr ferrite nanoparticles, demonstrating how controlled substitution and nanostructuring can be used to engineer materials tailored for magnetic storage, spintronic technologies, and photocatalytic systems. [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.)
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        Value: 10.1080/14328917.2025.2610211
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        Text: English
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        PageCount: 22
        StartPage: 429
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      – SubjectFull: Magnetic properties
        Type: general
      – SubjectFull: Optical properties
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      – SubjectFull: Magnetism
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      – SubjectFull: Magnetic nanoparticles
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      – SubjectFull: Ferromagnetism
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      – SubjectFull: Crystal structure
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      – TitleFull: Influence of Ni–Cr substitution on structural, magnetic, and optical properties of nanoferrites.
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            – D: 01
              M: 06
              Text: Jun2026
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              Y: 2026
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