Structural, electronic, vibrational and magnetic properties of Zn2+ substituted MnCr2O4 nanoparticles

Autor(es):Mostrar menos -

Manjunatha, K. ^[1] ; Angadi, V. Jagadeesha ^[2] ; Ribeiro, Renan A. P. ^[3] ; Longo, Elson ^[3] ; Oliveira, Marisa C. ^[4] ; Bomio, Mauricio R. D. ^[4] ; de Lazaro, Sergio R. ^[5] ; Matteppanavar, Shidaling ^[6] ; Rayaprol, S. ^[7] ; Babu, P. D. ^[7] ; Pasha, Mahaboob ^[1]

Afiliação do(s) autor(es)

^[1] Presidency Univ, Sch Engn, Dept Phys, Bangalore 560064, Karnataka - India

^[2] PC Jabin Sci Coll, Deparment Phys, Hubballi 580031 - India

^[3] Univ Fed Sao Carlos, CDMF UFSCar, POB 676, BR-13565905 Sao Carlos, SP - Brazil

^[4] Univ Fed Rio Grande do Norte UFRN, LSQM, DEMat, POB 1524, BR-59078970 Natal, RN - Brazil

^[5] Dept Chem, Av Gen Carlos Cavalcanti 4748, BR-84030000 Ponta Grossa, Parana - Brazil

^[6] Basavaprabhu Kore Arts Sci & Commerce Coll, Dept Phys, Chikodi 591201 - India

^[7] Mumbai Ctr, UGC DAE CSR, BARC Campus, Mumbai 400085, Maharashtra - India

• Tipo de documento: Artigo Científico
• Fonte: Journal of Magnetism and Magnetic Materials; v. 502, MAY 15 2020.
• Citações Web of Science: 0

Resumo

In the present investigation, we report the structural, vibrational, electronic and magnetic properties of Mn0.5Zn0.5Cr2O4 nanoparticles fabricated by the solution combustion method and complemented by Density Functional theory (DFT) calculations. X-ray diffraction (XRD), Neutron diffraction, X-ray photoelectron spectroscopy and Raman analysis confirms the formation of single-phase with spinel cubic structure. The average crystallite size was found to be 8 nm. The theoretical calculations suggest that Zn-doping on the MnCr2O4 matrix induces a unit cell contraction associated with structural distortions along both {[}AO(4)] (A = Mn, Zn) and {[}CrO6] clusters, in agreement with the experimental evidence. These structural distortions contribute to narrowing the band-gap of Mn0.5Zn0.5Cr2O4 from disturbed energy levels in the vicinity of Fermi level. Field dependent magnetization confirms that the samples exhibit paramagnetic nature at 300 K and antiferromagnetic nature at 3 K. In the theoretical context, the exchange coupling constant for pure and Zn2+ substituted MnCr2O4 materials were calculated confirming the dominant antiferromagnetic character of Cr-Cr interactions. The temperature dependent susceptibility reveals that the magnetic transition from paramagnetic phase to antiferromagnetic phase occurs at 19 K (T-N). The spin frustration factor of Mn0.5Zn0.5Cr2O4 is found to be 22 K. Hence, our experimental and theoretical result suggests that synthesized materials are useful for low and high frequency applications. (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