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2017 | OriginalPaper | Chapter

5. Morphology and Optical Properties of SrWO₄ Powders Synthesized by the Coprecipitation and Polymeric Precursor Methods

Authors : Júlio César Sczancoski, Máximo Siu Li, Valmor Roberto Mastelaro, Elson Longo, Laécio Santos Cavalcante

Published in: Recent Advances in Complex Functional Materials

Publisher: Springer International Publishing

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Abstract

Industries are technologically dependent of new materials with a high optical efficiency for the development of electrooptical devices. In particular, ceramic oxides have a wide potential to supply this technological demand, especially those belonging to the scheelite group. A well-known scheelite in the scientific community is the strontium tungstate (SrWO₄) because of their typical luminescence emissions. In addition, the main parameters responsible for the changes of physicochemical properties of any material are crystalline structure, composition, surface chemistry, particle sizes, and shapes. These parameters can be directly affected by the synthesis methods as well as due to their experimental conditions. In this chapter it was reported the synthesis of SrWO₄ powders by two distinct chemical routes (coprecipitation and polymeric precursor method), which were subsequently heat-treated at different temperatures in a resistive furnace and a microwave oven. The aim of this study was to investigate the effects induced by both synthesis methods and heat treatment conditions (conventional and microwave) on the morphological aspects and optical properties of SrWO₄. The details on the structural rearrangement at long and short range were investigated by means of X-ray diffraction patterns, Raman spectra, and X-ray absorption near-edge structure spectra at the W L ₃-edge, respectively. Field emission-scanning electron microscopy was an essential technique in order to verify the shape and distribution of the particle system. The optical properties were based on measurements of ultraviolet-visible absorption spectra and photoluminescence spectra at room temperature. In principle, these results were correlated to reveal a better interpretation of experimental data at the atomic level, providing new insights on the morphological and optical properties of SrWO₄ crystals. Particularly, the explanations on these properties were based on structural order-disorder effects, which will be analyzed and discussed with more details along this chapter.

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Title: Morphology and Optical Properties of SrWO4 Powders Synthesized by the Coprecipitation and Polymeric Precursor Methods
Authors: Júlio César Sczancoski
Máximo Siu Li
Valmor Roberto Mastelaro
Elson Longo
Laécio Santos Cavalcante
Publisher: Springer International Publishing
Book: Recent Advances in Complex Functional Materials
Print ISBN: 978-3-319-53897-6

Electronic ISBN: 978-3-319-53898-3

Copyright Year: 2017
DOI: https://doi.org/10.1007/978-3-319-53898-3_5

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