Journal of Superconductivity and Novel Magnetism

, Volume 32, Issue 11, pp 3655–3669 | Cite as

Effect Cr3+ Ion Substitution on the Structural, Magnetic, and Dielectric Behavior of Co–Cu Ferrite

  • Chandan C. Naik
  • A. V. SalkerEmail author
Original Paper


Cr3+ substituted cobalt–copper ferrites with chemical composition Co0.9Cu0.1Fe2−xCrxO4 (where x = 0.00, 0.03, 0.06, 0.09, 0.12, and 0.15) were prepared by sol–gel mediated auto combustion route utilizing malic acid as a complexing agent. The effect of incorporation of Cr3+ ions in low concentration on the structural, magnetic, dielectric, and electrical features of the Co–Cu ferrite compounds was investigated. The crystalline nature and variation in crystallite size with substituent content were identified from X-ray diffraction. Cr3+ substitution for Fe in the Co–Cu ferrite leads to a monotonic decrease in the saturation magnetization at 300 K as well as at 50 K, which could be credited to the decrease in strength of superexchange interaction on the substitution of Fe3+ ions by weakly magnetic Cr3+ ions in the octahedral site. Substitution of small fractions Cr3+ ions for some of the Fe in cobalt–copper ferrites decreased the Curie temperature. A decreasing pattern in DC resistivity with an increase in temperature was observed ensuring the semiconducting character of the ferrites under test. Dielectric properties such as dielectric constant (ε′) and dielectric loss (tan δ) of prepared materials were investigated.


Cr3+ substitution Magnetic studies Mӧssbauer spectroscopy Co–Cu ferrite Dielectric studies 



The authors gratefully acknowledge Dr. V Sathe and Dr. V R Reddy, UGC-DAE consortium for scientific research, Indore, Madhya Pradesh, India, for providing Raman and Mӧssbauer facility. The authors are also thankful to UGC-BSR program, New Delhi, for providing UGC-BSR fellowship.

Supplementary material

10948_2019_5153_MOESM1_ESM.docx (15 kb)
ESM 1 (DOCX 14 kb)


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Authors and Affiliations

  1. 1.Department of ChemistryGoa UniversityTaleigãoIndia

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