Effect of La3+and Ni2+ substitution on Sr1-xLaxFe12-yNiyO19 hexaferrite structural, magnetic, and dielectric properties

• Published in: Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2023-03, Vol.289, p.116257, Article 116257
• Main Authors: Rambabu, Ch, Uppugalla, Susmitha, Verma, Ritesh, Ramakrishna, A., Murali, N., Shivanarayana, Ch, Parajuli, D., Suryanarayana, B., Mujasam Batoo, Khalid, Hussain, Sajjad, Lakshmi Narayana, P.V.
• Format: Article
• Language: English
• Subjects: Coercivity; Dielectric constant; Hexaferrite; Loss tangent; Magnetic saturation
• ISSN: 0921-5107; 1873-4944
• DOI: 10.1016/j.mseb.2022.116257

•Strontium nano-hexaferrite with substitution of La3+ and Ni2+ for a concentration of were prepared using sol–gel auto combustion approach.•XRD pattern confirmed the formation of a single-phase hexagonal structure with a space group of P63/mmc.•A small particle agglomeration rate was observed with the grain size ranging from 1.5 µm to 200 nm.•The saturation magnetization Ms and coercivity Hc of the magnetic material ranged from 46.89 to 62.37 emu/g and 3673.88Oe to 4826.10Oe, respectively.•The present investigation shows that lanthanum and nickel-substituted strontium nano-hexaferrite is a suitable candidate to participate in the league of electromagnetic wave absorbing materials while the one with concentration level 0.15–0.2 can be studied further at higher frequencies for their usage in the high-frequency domain. Herein, Sol-gel auto combustion is used to successfully synthesize M−type La3+ and Ni2+ substituted strontium nano-hexaferrite, Sr1-xLaxFe12-yNiyO19 (where ×  = y = 0.0, 0.05, 0.1, 0.15, and 0.2), powders. The prepared materials are sintered at a temperature of 1200 °C for 2 h. Characterization techniques like XRD, FT-IR, FE-SEM, VSM, and LCR Meter Bridge are used to study the structural, morphological, magnetic, and dielectric properties at room temperature. The XRD analysis of samples confirmed the formation of a single-phase hexagonal structure with P63/mmc space group. The saturation magnetization values initially increased and then decreased after ×  = 0.15 with the increase in La3+ and Ni2+ ions content. The coercivity showed irregular variation with the increase in dopants concentration. The loss tangent and dielectric constant parameters were also obtained to investigate the dielectric nature of prepared samples.