| Texto completo | |
| 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]
Número total de Autores: 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
Número total de Afiliações: 8
|
| 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 |