Orthorhombic SnO2 phase observed composite (Sn1-xCex)O-2 synthesized by sol-gel route

Autor(es)

Carvalho, M. H. ^[1] ; Pereira, E. C. ^[2] ; de Oliveira, A. J. A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Phys Dept, UFSCar, POB 676, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos, Chem Dept, UFSCar, LIEC, POB 676, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: RSC ADVANCES; v. 8, n. 8, p. 3958-3963, 2018.
• Citações Web of Science: 6

Resumo

Semiconductor oxides are a class of materials used in many different applications, such as catalysis, solar cells and magnetic devices. In particular, composites with different semiconducting oxides follow synergetic effects with changes of electrical conductivity or magnetic properties. In this case, the synthesis conditions are very important for controlling their properties due to structural defects and non-stable phases at room temperature. In this paper, we analyzed the influence of the synthesis temperature and different concentrations of cerium in the formation of the orthorhombic SnO2 phase. The structural and morphological characterization was performed using experimental techniques such as X-ray diffraction (XRD), allied with Rietveld refinement, field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS). The reflections in the XRD pattern and clear lattice fringes observed by HRTEM confirm the formation of the orthorhombic SnO2 phase in the (Sn1-xCex)O-2 with x = 0, 0.05, 0.1 and 0.3 synthesized at 750 degrees C. The reducing atmosphere generated by the heat treatment process of the samples and the strain originated due to the difference of ionic radii between the tin and cerium ion can play a crucial role in the formation of the orthorhombic phase of SnO2. (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: 17/24995-2 - Magnetismo em materiais multifuncionais
• Beneficiário: Adilson Jesus Aparecido de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Regular