Room temperature electrochemical growth of polycrystalline BaMoO4 films

The pH-concentration diagram for the formation of barium molybdate films on a metallic molybdenum substrate in a barium hydroxide aqueous solution has been experimentally studied. Due to the relatively large solubility of the molybdate, the estimation of film thickness from the weight gain was corre...

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Bibliographic Details
Published inJournal of the European Ceramic Society Vol. 23; no. 3; pp. 519 - 525
Main Authors XIA, Chang-Tai, FUENZALIDA, V. M
Format Journal Article
LanguageEnglish
Published Oxford Elsevier 01.03.2003
Subjects
Cross-disciplinary physics: materials science; rheology
Electrodeposition, electroplating
Exact sciences and technology
Materials science
Methods of deposition of films and coatings; film growth and epitaxy
Physics
Scanning electron microscopy
pH value
Inorganic compounds
Films
Polycrystals
XRD
Molybdates
Experimental study
Barium Molybdates
Aqueous solutions
Ambient temperature
Growth mechanism
Crystal growth from solutions
Electrodeposition
Crystal nucleation
Chemical concentration
X-ray photoelectron spectra
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Summary:The pH-concentration diagram for the formation of barium molybdate films on a metallic molybdenum substrate in a barium hydroxide aqueous solution has been experimentally studied. Due to the relatively large solubility of the molybdate, the estimation of film thickness from the weight gain was corrected by considering the substrate dissolution. The molybdenum substrates had a preferential [100] crystallographic orientation, but the films exhibited no preferential orientation. It is suggested that the film grows through a dissolution-precipitation mechanism and that nucleation begins only after the solution is locally saturated with barium molybdate. Irregular intergrowth is frequent due to the high crystal growth rate. XPS measurements on samples that appeared completely coated under SEM examination exhibited only the peaks corresponding to barium molybdate. On the other hand, the substrates that appeared partially coated under SEM, when examinated by XPS exhibited the superposition of spectra of the molybdate and of the uncoated molybdenum substrate. This allows the study of the degree of coating as a function of the solution concentration and pH.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0955-2219
1873-619X
DOI:10.1016/S0955-2219(02)00149-8