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Tungstate intercalated Mg-Al layered double hydroxide and its derived mixed metal oxide: preparation, characterization, and investigation of optical, electrical, and dielectric properties

Published online by Cambridge University Press:  28 February 2025

Redouane Lahkale  and
Elmouloudi Sabbar
Redouane Lahkale*
Affiliation:
Laboratory of Physical Chemistry of Material, Department of Chemistry, Faculty of Sciences, University of Chouaîb Doukkali, El Jadida, Morocco
Elmouloudi Sabbar*
Affiliation:
Laboratory of Physical Chemistry of Material, Department of Chemistry, Faculty of Sciences, University of Chouaîb Doukkali, El Jadida, Morocco
*
Corresponding authors: R. Lahkale and E. Sabbar; Emails: [email protected]; [email protected]
Corresponding authors: R. Lahkale and E. Sabbar; Emails: [email protected]; [email protected]
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Abstract

Layered double hydroxides intercalated with tungstate ions ([WO4]2–) are among the anionic clays with interesting applications due to the physicochemical properties of the element tungsten. Their transformation by calcination into the corresponding derived mixed metal oxides should modify their properties. In view of this, the aim of this study is to compare the light absorption behavior of tungstate intercalated Mg-Al layered double hydroxide (LDH) with that of its derived mixed metal oxide (MMO), as well as their electrical and dielectric properties. The LDH precursor was prepared successfully by the co-precipitation method at pH 10, while MMO was obtained by calcining LDH at 723 K. Subsequently, LDH and MMO were characterized by X-ray diffraction and analyzed by thermal gravimetric analysis/differential thermal analysis and Raman spectroscopy. The electrical response, modeled by an equivalent circuit, was found to be intimately dependent on the structures of LDH and MMO, while the light absorption behavior is mainly due to the presence of the distorted [WO4]2– and the tetragonal MgWO4 in LDH and MMO, respectively. In addition, MMO showed an improvement in the dielectric properties through the large decrease in the dielectric loss tangent and electrical conductivity. However, LDH exhibited greater absorption coefficients in the ultraviolet region with a lower optical energy gap compared with its derived MMO, resulting in energy gaps of 4.23 and 4.35 eV for LDH and MMO, respectively. Results revealed that calcining LDH to form MMO fails to improve light absorption, but does improve the dielectric behavior, which makes possible the use of LDH as a shielding material against UV light and MMO for energy storage applications.

Keywords

dielectric propertieselectrical propertiesMgWO4mixed-metal oxideoptical propertiestungstate-intercalated layered double hydroxide[WO4]2–
Type
Original Paper
Information
Clays and Clay Minerals , Volume 73 , 2025 , e9
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Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of The Clay Minerals Society

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