Open AccessThe influence of chemical and thermal treatment on the point of zero charge of hydrous zirconium oxide
Author(s) -
Jovan Stanković,
S.K. Milonjić,
S. Zec
Publication year - 2012
Publication title -
journal of the serbian chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.227
H-Index - 45
eISSN - 1820-7421
pISSN - 0352-5139
DOI - 10.2298/jsc121010149s
Subject(s) - cubic zirconia , zirconium , point of zero charge , monoclinic crystal system , tetragonal crystal system , materials science , amorphous solid , crystallite , nuclear chemistry , potassium hydroxide , aqueous solution , inorganic chemistry , distilled water , crystallization , precipitation , chemistry , phase (matter) , metallurgy , crystal structure , crystallography , ceramic , organic chemistry , chromatography , meteorology , physics
Two zirconia samples were prepared by precipitation from aqueous zirconium oxychloride and zirconil sulphate solutions with potassium hydroxide. The prepared zirconia samples were amorphous. The pHpzc values of zirconia samples, determined from NaCl and NaNO3 solutions, were 6.6 ± 0.1 and 6.9 ± 0.1, respectively. After prolonged hydration of zirconia in doubly distilled water, pHpzc decreased to 4.7 ± 0.3. Crystallization into tetragonal (metastable) + monoclinic zirconia appeared at 691 K. Above 873 K, tetragonal metastable phase changes to monoclinic one. It was shown that crystallite sizes of zirconia treated at 673 - 1273 K increased from 9.5 nm to 40.5 nm, respectively. The increase in temperature from 385 K to 1070 K increased the pHpzc of zirconia samples from 6.6 to 9.0, respectively. [Projekat Ministarstva nauke Republike Srbije, br. 45012
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