Electrical and dielectric properties of PVA-doped NiGdxFe2-xO4 nanoferrite particles

• Published in: Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2024-10, Vol.308, Article 117610
• Main Authors: Lenin, N., Jabammal Raj, N., Rajesh Kanna, R., Karthikeyan, P., Balasubramanian, M., Karthik, A., Srither, S.R.
• Format: Article
• Language: English
• Subjects: Coercivity; Dielectric; Magnetic materials; Nanoferrites; Saturation magnetization; Structural
• ISSN: 0921-5107
• DOI: 10.1016/j.mseb.2024.117610

•PVA-doped NiGdxFe2-xO4 nanoferrites (x = 0.01, 0.03, 0.05, 0.07, and 0.09) are prepared.•Structural, morphological, dielectric and magnetic behavior are studied.•Dielectric behavior of nanoferrites enhanced as the amount of PVA increased.•Improved microwave absorption with higher quantities of PVA is reported.•Coercive force tends to decrease with an increase in the amount of PVA ions. NiGdxFe2-xO4 nanoferrites combined with polyvinyl alcohol (PVA) and having a distinct spinel phase composition (x = 0.01, 0.03, 0.05, 0.07, and 0.09) were effectively created. Several characterization approaches were used to study the structural, dielectric, and magnetic properties of the PVA-blended nanoferrites. The acquired X-ray diffraction pattern showed the spinel cubic structure. Crystallite sizes of 50, 44, 40, 35, and 31 nm were found in PVA-blended nanoparticles for x = 0.01, 0.03, 0.05, 0.07, and 0.09, respectively. When compared to the PVA-unblended nanoferrites, the PVA-blended nanoferrites showed insulating properties with an enlarged energy bandgap. Real and complex dielectric constants, as well as the measured dielectric loss, were all in the microwave range (frequency ∼ 1.88–5.93 GHz). At higher frequencies, the dielectric constant became constant after declining with frequency. From the PVA-blended nanoferrites impedance study, pseudocapacitance (x = 0.01, 0.03, and 0.05) and resistive behavior (x = 0.07 and 0.09) were investigated. The magnetization hysteresis plot of PVA-blended NiGdxFe2-xO4 nanoferrites revealed a mild ferromagnetic character. The PVA doping of the produced nanoferrites increased their saturation magnetization and had a considerable microwave absorption capacity. For the broadest range of electromagnetic radiation absorption, ferrite might be the perfect material. The addition of rare-earth ions to these basic ferrites results in a considerable modification of the ferrites’ electromagnetic characteristics.