bservation of dielectric dispersion and relaxation behavior in Ni2+-substituted cobalt ferrite nanoparticle

Autor(es)

Srinivasamurthy, K. M. ^[1] ; El-Denglawey, A. ^[2] ; Manjunatha, K. ^[3] ; Angadi, V, Jagadeesha ; Oliveira, M. C. ^[4] ; Longo, E. ^[4] ; Lazaro, S. R. ^[5] ; Ribeiro, R. A. P. ^[6]

Afiliação do(s) autor(es)

^[1] Bangalore Univ, Dept Phys, Bangalore 560056, Karnataka - India

^[2] Taif Univ, Coll Univ Coll Turabah, Dept Phys, POB 11099, At Taif 21944 - Saudi Arabia

^[3] Presidency Univ, Sch Engn, Dept Phys, Bangalore 560064, Karnataka - India

^[4] Univ Fed Sao Carlos, CDMF UFSCar, BR-13565905 Sao Carlos, SP - Brazil

^[5] Univ Estadual Ponta Grossa, Dept Chem, 4748 Gen Carlos Cavalcanti Ave, Ponta Grossa, PR - Brazil

^[6] Minas Gerais State Univ, Dept Chem, 3001 Parana Ave, Divinopolis, MG - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF MATERIALS CHEMISTRY C; v. 10, n. 9, p. 3418-3428, MAR 3 2022.
• Citações Web of Science: 0

Resumo

In this study, a joint theoretical and experimental approach was employed to investigate the structural, electronic, magnetic and dielectric properties of novel ferrite (CNF) Co1-xNixFe2O4 (x = 0.0, 0.25, 0.5, 0.75 and 1.0) nanoparticles obtained using a low-cost combustion synthesis technique. Structural analysis indicated the single-phase formation of synthesized ferrite with a cubic spinel structure. Rietveld refinement was performed to estimate the lattice constant, strain and cationic distances. Vibrational Raman spectroscopy was employed to further confirm the monophasic cubic spinel structure with inverse cation distribution associated with the increase of the T-2g(2) Raman mode, evidencing the presence of different cations at octahedral sites. The real part of the dielectric constant (epsilon') and the dielectric loss tangent (tan d) were explored as a function of frequency, and the Nyquist complex impedance plots of all the samples were studied. The electrical properties of the samples at room temperature demonstrated the dispersion behavior associated with Maxwell-Wagner interfacial polarization mechanism and the hopping of charge carriers. DFT calculations complemented the experimental characterization, indicating a ferrimagnetic ground state for all models associated with band gap increases and dielectric constant reduction with an increasing amount of Ni. The low dielectric loss with Ni2+ substitution at higher frequencies makes CNF a promising candidate in the electronics industry for energy-harvesting devices. (AU)

• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 21/01651-1 - CDMF - Centro de Desenvolvimento de Materiais Funcionais: estudo teórico de materiais multifuncionais com potencial aplicação antiviral
• Beneficiário: Marisa Carvalho de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado