Structure, thermal stability and microstructural properties of Bi4V2-x(Cu-Li)xO11-7x/4 solid solution (0.1 ≤ x ≤ 0.3)

IF 3 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Materialia Pub Date : 2024-12-31 DOI:10.1016/j.mtla.2024.102333
W. Mhaira , A. Agnaou , R. Essalim , M. Zaghrioui , T. Chartier , C. Autret , A. Ammar
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Abstract

The structural, thermal, and spectroscopic properties of Bi4V2-x(Cu-Li)xO11-7x/4 (0.1 ≤ x ≤ 0.5) compounds were investigated to explore the effects of copper and lithium substitution on the material's crystalline structure and phase transitions. X-ray diffraction (XRD) analysis revealed that increasing the substitution level from x = 0.1 to x = 0.3 resulted in phase transitions from monoclinic to orthorhombic, and eventually to tetragonal, with the solid solution limit at x = 0.3. The crystallinity and porosity showed an inverse relationship as the substitution rate increased, with crystallite size enlarging from x = 0.1 to x = 0.2, and a defect-trapping effect at higher substitutions (x = 0.3 and x = 0.4). Differential thermal analysis (DTA) and thermogravimetric analysis (TG) indicated significant endothermic transitions, with a peak at 698°C corresponding to the melting of a secondary phase isostructural to Bi8V2O17. High-temperature XRD (HT-XRD) analysis further supported the phase transitions, while Raman spectroscopy showed shifts in the V-O bond stretching vibrations with increasing substitution. The study concluded that substitution with copper and lithium modifies the thermal stability, crystallinity, and phase behaviour of BiCuLiVOx compounds, highlighting their potential in various applications requiring high-temperature stability and ionic conductivity.

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来源期刊
Materialia
Materialia MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
6.40
自引率
2.90%
发文量
345
审稿时长
36 days
期刊介绍: Materialia is a multidisciplinary journal of materials science and engineering that publishes original peer-reviewed research articles. Articles in Materialia advance the understanding of the relationship between processing, structure, property, and function of materials. Materialia publishes full-length research articles, review articles, and letters (short communications). In addition to receiving direct submissions, Materialia also accepts transfers from Acta Materialia, Inc. partner journals. Materialia offers authors the choice to publish on an open access model (with author fee), or on a subscription model (with no author fee).
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