Processing of submicrometric CaTi0.8Fe0.2O3-delta ceramics by mechanical activation
authors Fuentes, RO; Chinarro, E; Figueiredo, FM; Soares, R; Marques, FMB; Frade, JR
nationality International
journal JOURNAL OF MATERIALS SCIENCE
keywords X-RAY-DIFFRACTION; PHASE-TRANSITIONS; CALCIUM TITANATE; TEMPERATURE; CATIO3; CATI1-XFEXO3-DELTA; OXYGEN; MIXTURES
abstract Effects of mechanical activation of precursors in order to obtain CaTi0.8Fe0.2O3-delta are reported. Mixtures of CaCO3, TiO2 and Fe2O3 were dry-grinded in Teflon or zirconia containers using planetary ball-mills at different rotations (200, 300 and 500 rpm) and for various periods of time. The perovskite is not formed just by milling and a subsequent heat treatment at 800-1,000 degrees C was necessary. This still represents a significant advantage over the classical ceramic route as a result of the improved reaction kinetics due to the smaller grain size (< 100 nm) of the activated powders and a modification of the thermodynamic initial state. Dense ceramic samples showing a bimodal submicrometric grain-size distribution (100-200 and 250-500 nm) were obtained after sintering the activated powders at 1,150 degrees C TEM revealed homogeneous samples, free from inhomogeneities such as core-shell grains typically observed in ceramics obtained from non-activated precursors sintered at 1,320-1,350 degrees C.
publisher SPRINGER
issn 0022-2461
year published 2006
volume 41
issue 22
beginning page 7393
ending page 7400
digital object identifier (doi) 10.1007/s10853-006-0812-2
web of science category Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000242435600018
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