Impact of Lanthanum-Doping on the Physical and Electrical Properties of Cobalt Ferrites

• Published in: Journal of superconductivity and novel magnetism Vol. 34; no. 7; pp. 1855 - 1864
• Main Authors: Aslam, Asma, Razzaq, Abdul, Naz, S., Amin, Nasir, Arshad, Muhammad Imran, Nabi, M. Ajaz Un, Nawaz, Abid, Mahmood, Khalid, Bibi, Aisha, Iqbal, Faisal, Shakil, M., Farooq, Zahid, Iqbal, Muhammad Zahir, Haider, Syed Shabhi, Rehman, Atta ur
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.07.2021
• Subjects: Characterization and Evaluation of Materials; Condensed Matter Physics; Magnetic Materials; Magnetism; Original Paper; Physics; Physics and Astronomy; Strongly Correlated Systems; Superconductivity; Ferrites; X-ray diffraction; Raman; Resistivity
• ISSN: 1557-1939; 1557-1947
• DOI: 10.1007/s10948-021-05802-4

Cobalt ferrites have attracted extraordinary attention due to their high coercivity, chemical stability, and mechanical hardness. Lanthanum doped-cobalt ferrites having chemical formula CoLa x Fe 2-x O 4 with composition x = (0.00, 0.015, 0.045, 0.060) were synthesized by chemical co-precipitation method. The prepared samples were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, and current-voltage (I-V) technique. The structure of the crystal was analyzed by X-ray diffraction. The crystallite size of nanoparticles was examined in the range of 21–25 nm, and a fluctuating trend was found with the inclusion of La 3+ cations. The X-ray diffraction patterns verify the contraction of lattice constant and unit cell volume with the substitution of La 3+ cations except for the concentration of x = 0.060. Lattice constant was in the range of 8.34 Å–8.41 Å while unit volume cell was in the range of 580 Å 3 –596 Å 3 . The resistivity of all samples was calculated by the application of two probes I-V technique. The maximum resistivity of the order of 81.129 × 10 5  Ω cm was found for the concentration of x = 0.060 at 723 K which makes it useful for high-frequency gimmicks applications. The resistivity and drift mobility were found inversely related to each other. The inverse relation low-frequency absorption band and high-frequency absorption bands were analyzed by Fourier-transform infrared spectroscopy technique.