Orthorhombic SnO2 phase observed composite (Sn1−xCex)O2 synthesized by sol–gel route

RSC Advances

(a) TEM image of the sample x ¼ 0.3 calcined at 750 C. (b) HRTEM image (c) EDS spectrum of the sample. (d) Reconstructed HRTEM image of a CeO2 particle, which shows the lattice mismatch between CeO2 plans. (e–g) FFT pattern referring to the orthorhombic (O-SnO2), tetragonal (T-SnO2) phase and the cubic (C-CeO2) phase.

Orthorhombic SnO2 phase observed composite (Sn1−xCex)O2 synthesized by sol–gel route

Abstract: 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 SnO2phase in the (Sn1−xCex)O2 with x = 0, 0.05, 0.1 and 0.3 synthesized at 750 °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.

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RSC Advances

2018, 8, 3958

 

Link: http://pubs.rsc.org/en/Content/ArticleLanding/2018/RA/C7RA12727H#!divAbstract

DOI: https://doi.org/10.1039/c7ra12727h

PDF: RSC-ADvances – SnO2 Ortorrombico

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