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Investigation of structural transition in molybdates CuMo1-xWxO4 prepared by polymeric precursor method

Authors :
Mohamed Benchikhi
Rachida El Ouatib
Sophie Guillemet-Fritsch
Lahcen Er-Rakho
Bernard Durand
Source :
Processing and Application of Ceramics, Vol 11, Iss 1, Pp 21-26 (2017)
Publication Year :
2017
Publisher :
University of Novi Sad, 2017.

Abstract

Solid solutions (CuMo1-xWxO4 where 0 ≤ x ≤ 0.12) were synthesized by using a polymeric precursor method. The crystallization process of the polymeric precursors was investigated using TG-DTA, FTIR and XRD techniques. Crystallization of the CuMo1-xWxO4 powders was detected at 300 °C, and entirely completed at 420 °C. XRD patterns revealed that the polymorphic variety was dependent upon the tungsten content. For x ≤ 0.075, the solid solutions were isostructural to α-CuMoO4 whereas, for 0.075 < x ≤ 0.12, they were isostructural to γ-CuMoO4. The obtained homogeneous powders are constituted of relatively spherical grains with sizes in the range 0.5–2.0 µm. The phase transition of the as-synthesized CuMo1-xWxO4 powders was investigated by X-ray diffraction at elevated temperature and dilatometry. The temperature of the structural transition γ → α during heating was dependent upon the tungsten content.

Details

Language :
English
ISSN :
18206131 and 24061034
Volume :
11
Issue :
1
Database :
Directory of Open Access Journals
Journal :
Processing and Application of Ceramics
Publication Type :
Academic Journal
Accession number :
edsdoj.42d9e15b5302463aa9bb2bf576083b10
Document Type :
article
Full Text :
https://doi.org/10.2298/PAC1701021B