ISSN:
1551-2916
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Monoclinic hydrous-zirconia fine particles that contained cerium(IV) hydroxide (Ce(OH)4) were heated from 200°C to 600°C, to investigate the phase transformation to CeO2-doped tetragonal ZrO2. Both ZrOCl2·8H2O and CeCl3·7H2O were dissolved in aqueous solutions and then boiled to prepare the hydrous-zirconia particles. The Ce(OH)4-containing hydrous-zirconia particles were prepared by adding aqueous ammonia into the boiled solutions. The monoclinic-to-tetragonal (m right arrow t) phase transformation of the Ce(OH)4-containing hydrous zirconias was observed at 300°C using X-ray diffraction (XRD). XRD and Brunauer-Emmett-Teller (BET) specific surface area measurements revealed that the Ce(OH)4-containing hydrous zirconias had a tendency to transform from the monoclinic phase to the tetragonal phase at lower temperatures as the primary particle size of the hydrous zirconia decreased and the Ce(OH)4 content increased. These tendencies for the m right arrow t phase transformation agree with the conclusions that have been derived from thermodynamic and kinetic considerations.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1151-2916.1999.tb02196.x
