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Nanocrystals of h-WO3 (P6/mmm, PDF 33–1387) with uncommon morphology of nanoplates with ∼10 nm thickness and up to 200 nm in diameter have been precipitated with nitric acid from aqua ammonium tungstate solution. The h - β phase transition occurs at T= 385°C as it have been established with DTA and XRD measurements. IR and Raman spectra have been recorded for precipitated and calcined phases. These...
α-MoO3 micropalettes with high-quality surface have been formed by annealing of intermediate molybdenum oxide at T = 650°C in air. The intermediate molybdenum oxide was prepared by thermal decomposition of molybdenum formate at T = 450°C under oxygen deficiency. The chemical composition, structure and micromorphology of intermediate products and α-MoO3 micropalettes have been examined with XRD, SEM,...
TiO2 nanoporous microspheres with diameter of 20 μm and good crystallinity have been obtained by precipitation from water solution of ammonium titanate with nitric acid at pH = 1 and T = 100°C without thermal treatment of final product. Rutile structural type formation (space group P42/mnm, PDF 21–1276) have been confirmed with XRD analysis. SEM analysis indicates the presence of developed nanoporous...
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