Heat-treatment induced evolution of the morphology and microstructure of zirconia prepared from chloride solutions during

The properties of hydrous zirconia prepared from ZrOCl 2 solutions were studied as functions of precipitation pH and subsequent heat treatment. Precipitation at pH ≤ 6 yields hydrous zirconia containing excess sorbate anions (Cl − ), and at pH ≥ 7, ammonium ions. This difference considerably affects...

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Bibliographic Details
Published in:Russian journal of inorganic chemistry 2008-06, Vol.53 (6), p.842-848
Main Authors: Stenina, I. A., Voropaeva, E. Yu, Brueva, T. R., Sinel’nikov, A. A., Drozdova, N. A., Ievlev, V. M., Yaroslavtsev, A. B.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Inorganic Chemistry
Synthesis and Properties of Inorganic Compounds
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Summary:The properties of hydrous zirconia prepared from ZrOCl 2 solutions were studied as functions of precipitation pH and subsequent heat treatment. Precipitation at pH ≤ 6 yields hydrous zirconia containing excess sorbate anions (Cl − ), and at pH ≥ 7, ammonium ions. This difference considerably affects the thermolysis and morphology of the resulting samples. The samples prepared at pH ≥ 7 have far better developed surfaces. The morphological and structural evolution of hydrous zirconia samples during heat treatment is described. The involved processes are interpreted. At initial stages, the major process is the formation of metastable tetragonal ZrO 2 , which transforms to the monoclinic phase during subsequent heating.
ISSN:0036-0236
1531-8613
DOI:10.1134/S003602360806003X