Effect of Cr^(3+) substitution on magnetic and electrical properties of (Ni_(0.3)Cu_(0.7)) Fe_(2)O_(4) spinel ferrites

• K. Bashir ^[1] ; M.-ul-Islam ^[1] ; M. Ajmal ^[1] ; M. Hussain ^[1] ; M. Waqas Nafees ^[1] ; A. Iftikhar ^[1] ; I.H. Gul ^[2] ; S. Naseem ^[3] ; K. Mehmood ^[4]
  1. [1] Bahauddin Zakariya University

     Bahauddin Zakariya University

     Pakistán

     
  2. [2] School of Chemical and Materials Engineering, NUST, Islamabad
  3. [3] Center of Excellence in Solid State Physics, Punjab University, Lahore
  4. [4] Department of Mechanical Engineering, CEME, NUST, Islamabad

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• Localización: Revista Mexicana de Física, ISSN-e 0035-001X, Vol. 66, Nº. 5, 2020, págs. 573-579
• Idioma: inglés
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• Resumen

  • Chromium substituted copper base spinel ferrites (Ni_(0.3)Cu_(0.7))Cr_(X)Fe_(2−X)O_(4) were prepared by Sol-gel method. Structural, magnetic and electrical properties were studied by utilizing an X-ray diffractometer, vibrating-sample magnetometer, and precision LCR-meter using labtracer software. The X-ray diffraction analysis confirmed the formation of single phase fcc structure of the samples. The lattice constant and crystallite size decreased from 8.37-8.23 Å and 53.09-35.36 nm, respectively with increasing content of Cr^(3+) ions. From Magnetization Vs Applied field loops it was observed that the saturation magnetization decreased and coercivity increased with increasing content of Cr^(3+) ions. Dc resistivity increased with increase of Cr^(3+) concentration and decreased with increase in temperature which shows the semiconducting behavior of ferrites. The dielectric constant, dielectric loss, and tangent loss decreased with increase of Cr^(3+) concentration. The dielectric constant follows bilayer Maxwell Wagner model and Koop’s phenomenological theory while ac conductivity increased with increasing frequency following Jonscher’s power law.