Formation and microstructural variation of cerium carbonate hydroxide prepared by the hydrothermal process
Resource
Materials Science and Engineering B 90 (1-2): 138-141
Journal
Materials Science and Engineering B
Journal Issue
90
Pages
138-141
Date Issued
2002
Date
2002
Author(s)
Wang, Hsien-Cheng
DOI
246246/2006111501244001
Abstract
Crystallized cerium carbonate hydroxide (CeCO3OH) powders have been fabricated successfully via a newly developed
hydrothermal process. Comparing with the traditional precipitation method, the reaction time for synthesizing CeCO3OH under
the hydrothermal condition is remarkably shortened. The hydrothermally derived CeCO3OH powders exhibit a rhombic shape
with an aspect ratio of around 4–5. The aspect ratio of CeCO3OH powders increases slightly with prolonging reaction time. Based
on the thermal analysis, a phase transformation from orthorhombic CeCO3OH into cubic fluorite CeO2 is confirmed to take place
at around 250 °C. Fine CeO2 powders are obtained after quenching the CeCO3OH powders during heat treatment. The formation
of fine CeO2 powders is attributed to the rapid decomposition reaction and resultant thermal stress in quenching treatment.
Subjects
Cerium carbonate hydroxide
Hydrothermal process
Microstructural variation
Publisher
Taipei:National Taiwan University Dept Chem Engn
Type
journal article
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