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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
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]
Total Authors: 8
Affiliation:
[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
Total Affiliations: 8
Document type: Journal article
Source: JOURNAL OF MATERIALS CHEMISTRY C; v. 9, n. 20, p. 6452-6469, MAY 28 2021.
Web of Science Citations: 2
Abstract

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)

FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 21/01651-1 - CDMF - Functional Materials Development Center: theoretical study of multifunctional materials with potential antiviral application
Grantee:Marisa Carvalho de Oliveira
Support Opportunities: Scholarships in Brazil - Post-Doctoral