Characterization of nanosized Al2(WO4)3

Nanosized aluminum tungstate Al2(WO4)3 was prepared by co-precipitation reaction between Na2WO4 and Al(NO3)3 aqueous solutions. The powder size and shape, as well as size distribution are estimated after different conditions of powder preparation. The purity of the final product was investigated by XRD and DTA analyses, using the single crystal powder as reference. Between the specimen and the reference no difference was detected. The crystal structure of Al2(WO4)3 nanosized powder was confirmed by TEM (SAED, HRTEM). In additional, TEM locality allows to detect some W5O14 impurities, which are not visible by conventional X-ray powder diffraction and thermal analyses.

TEM method allows to detect small quantities of impurities not detectable by other methods. In our case impurities of W5O14 are detected in Al2(WO4)3 nanopowder.Figure optionsDownload as PowerPoint slideHighlights
► Nanosized Al2(WO4)3 by simple co-precipitation method.
► Spherical particles with mean size of 22 nm distributed between 10 and 40 nm at 630 °C.
► XRD, DTA and TEM confirm well defined products with perfect structure.
► TEM locality allows detection of impurities not detectable by XRD and DTA.