Rapid synthesis of the low thermal expansion phase of Al2Mo3O12 via a sol–gel method using polyvinyl alcohol
Aluminum molybdate was successfully synthesized using a simplified PVA assisted sol–gel method resulting in highly crystalline, monophasic (monoclinic P21/a) samples. These materials could readily be obtained at temperatures of 600 and 700 °C after calcining for as little as 15–20 min. Scanning electron microscopy and X-ray powder diffraction indicated that even the sample calcined at 600 °C for 20 min was free of impurities and composed of submicron sized particles (~300 nm). Transmission electron microscopy was used to confirm the monophasic character and submicron dimensions of the as-prepared powders. In addition to producing high quality samples, it was also observed that the metal to PVA ratio used during this simplified synthesis, could be used as a control parameter for tailoring the particle sizes of the final product.
KeywordsSol–gel PVA Synthesis A2M3O12 Al2Mo3O12 Thermal expansion
M.S. is grateful to FAPERJ for post-doctoral fellowship. B.A.M. acknowledges support from the National Counsel of Technological and Scientific Development (CNPq) for Research Productivity Grant. B.A.M, P.M.J. and F.R. are grateful to National Counsel of Technological and Scientific Development (CNPq) for the Project CIAM number 490925/2008-1. M.A.W. acknowledges support from NSERC of Canada, along with the Canada Foundation for Innovation, Atlantic Innovation Fund and other partners that fund the Facilities for Materials Characterization managed by the Institute for Research in Materials at Dalhousie University. We acknowledge A. Cerqueira, G. Heverly-Coulson, and A. Bourque for useful discussions and comments.
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