Towards shape-oriented Bi-doped CoCr2O4 nanoparticles from theoretical and experimental perspectives: structural, morphological, optical, electrical and magnetic properties

Autor(es)

Manjunatha, K. ^{[1, 2]} ; Angadi, V. Jagadeesha ^[3] ; Oliveira, M. C. ^[4] ; de Lazaro, S. R. ^[5] ; Longo, E. ^[4] ; Ribeiro, R. A. P. ^[6] ; Manjunatha, S. O. ^[7] ; Ayachit, N. H. ^[8]

Afiliação do(s) autor(es)

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

^[2] Presidency Univ, Sch Engn, Mat Res Ctr, Bangalore 560064, Karnataka - India

^[3] PC Jabin Sci Coll, Dept Phys, Hubballi 580031 - India

^[4] Univ Fed Sao Carlos, CDMF UFSCar, POB 676, BR-13565905 Sao Carlos, SP - Brazil

^[5] Univ Estadual Ponta Grossa, Dept Chem, Av Gen Carlos Cavalcanti 4748, BR-84030900 Ponta Grossa, Parana - Brazil

^[6] Minas Gerais State Univ, Dept Chem, Av Parana 3001, BR-35501170 Divinopolis, MG - Brazil

^[7] Ramaiah Univ Appl Sci, FMPS, Dept Phys, Bengaluru 560058 - India

^[8] KLE Technol Univ, Hubballi 580031 - India

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF MATERIALS CHEMISTRY C; v. 9, n. 20, p. 6452-6469, MAY 28 2021.
• Citações Web of Science: 2

Resumo

In the present work, Co(1-x)BixCr2O4 (where x = 0.00, 0.05, and 0.10) nanoparticles were investigated in detail by combining theoretical and experimental efforts. The Co(1-x)BixCr2O4 (where x = 0.00, 0.05, and 0.10) nanoparticles were synthesized via a solution combustion method and studied through structural, microstructural, electrical, and magnetic analysis complemented by DFT calculations. The structural analysis confirmed a single-phase spinel cubic structure with singular structural distortions associated with Bi-doping and the generation of metal vacancies. The nanoparticles mainly enclosed the (100), (110), and (311) surfaces of the cubic spinel chromite structure, resulting in under-coordinated Co, Cr and Bi centers along their exposed surfaces. The dielectric parameters were explained using Koop's phenomenological theory, Maxwell-Wanger theory, and thermal energy of the vibrations, highlighting the role of Bi-doping in controlling the ferroic orders for the Co(1-x)BixCr2O4 nanoparticles. Moreover, the magnetic analysis indicated a paramagnetic to long-range collinear ferrimagnetism transition at the Curie temperature and non-collinear ferrimagnetism at the spiral transition temperature. These transitions are associated with the exchange coupling constants, as evaluated by DFT calculations before and after Bi-doping. Indeed, the effect of Bi-doping on the magnetic properties was determined to be a reduction in superficial magnetism, resulting in a diminished magnetization value for the doped samples, which is attributed to the major exposure of the (110) and (311) surfaces. Furthermore, the investigation of the morphological modulation of Co(1-x)BixCr2O4 nanoparticles through this innovative and unified procedure can guide other experimental studies in the rational design of superior multiferroic nanoparticles. (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