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Sol-Gel Synthesis of the Double Perovskite SrFeMoO by Microwave Technique. | LitMetric

Sol-Gel Synthesis of the Double Perovskite SrFeMoO by Microwave Technique.

Materials (Basel)

Unidad Morelia, Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Antigua carretera a Pátzcuaro No. 8701, Col. Ex Hacienda de San José de la Huerta, Morelia 58190, Mexico.

Published: July 2021

AI Article Synopsis

  • * Microwaves reduce crystallite size due to altered reaction temperatures, producing particles that range from 378 to 318 nm under specific pH and pressure conditions.
  • * Both microwave and non-microwave methods yield high-purity products with uniform morphology, but microwaves result in a higher Curie temperature and improved ionic precursor diffusion during synthesis.

Article Abstract

The effect of microwave radiation on the hydrothermal synthesis of the double perovskite SrFeMoO has been studied based on a comparison of the particle size and structural characteristics of products from both methods. A temperature, pressure, and pH condition screening was performed, and the most representative results of these are herein presented and discussed. Radiation of microwaves in the hydrothermal synthesis method led to a decrease in crystallite size, which is an effect from the reaction temperature. The particle size ranged from 378 to 318 nm when pH was 4.5 and pressure was kept under 40 bars. According to X-ray diffraction (XRD) results coupled with the size-strain plot method, the product obtained by both synthesis methods (with and without microwave radiation) have similar crystal purity. The Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) techniques showed that the morphology and the distribution of metal ions are uniform. The Curie temperature obtained by thermogravimetric analysis indicates that, in the presence of microwaves, the value was higher with respect to traditional synthesis from 335 K to 342.5 K. Consequently, microwave radiation enhances the diffusion and nucleation process of ionic precursors during the synthesis, which promotes a uniform heating in the reaction mixture leading to a reduction in the particle size, but keeping good crystallinity of the double perovskite. Precursor phases and the final purity of the SrFeMoO powder can be controlled via hydrothermal microwave heating on the first stages of the Sol-Gel method.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8305548PMC
http://dx.doi.org/10.3390/ma14143876DOI Listing

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