Journal
CERAMICS INTERNATIONAL
Volume 44, Issue 14, Pages 16606-16614Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.06.087
Keywords
Strontium molybdate; EDTA-citrate method; 2(3) Experimental design; Optical bandgap; Morphology
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Funding
- Coordination of Improvement of Higher Level Personnel (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - CAPES)
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It was initially used a 2(3) experimental design with central point in triplicate to synthesize strontium molybdate by EDTA-citrate combined complexation method, where the influence of pH (6, 7.5 e 9), calcining time (3, 4 e 5 h) and heating rate (5, 7 e 10 degrees C min(-1)) was investigated. Single-phase powders were obtained when calcined at 650 degrees C with tetragonal crystalline structure. The heating rate is the most influent independent variable on the intensities of the X-ray diffractions peaks. The synthesized powders are shown as agglomerates with irregular spherical and bipyramidal morphology. According to the experimental design, the conditions of calcining time of 3 h and heating rate of 10 degrees C min(-1) show the lowest values of energy band gap (4.18 and 4.17 eV) for pH 6 and 9, respectively. The statistical models generated were able to describe the phenomena observed.
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