| Autor: | H. Garth Spencer, A. Corina Geiculescu |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Zirconium
Aqueous solution Thermal decomposition Inorganic chemistry chemistry.chemical_element Sulfuric acid General Chemistry Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Biomaterials chemistry.chemical_compound chemistry Nitric acid law Materials Chemistry Ceramics and Composites Cubic zirconia Crystallization Monoclinic crystal system Nuclear chemistry |
| Zdroj: | Journal of Sol-Gel Science and Technology. 17:25-35 |
| ISSN: | 0928-0707 |
| DOI: | 10.1023/a:1008700803565 |
| Popis: | Zirconia powders were prepared by forming gels by desiccation of aqueous precursor solutions of zirconium acetate containing nitric or sulfuric acid at pH 2.4 and 1.4 and pyrolyzing the gels to temperatures up to 825°C. The structure development in the gels and solid pyrolysis products was investigated. The crystalline zirconia structures produced monoclinic (m), metastable cubic (c) and tetragonal (t) polymorphs. The structure transition temperatures were strongly dependent on the pH, the anions and the stoichiometry of the zirconium complex in the precursor solution. The monoclinic polymorph fraction in the zirconia formed by pyrolyzing the gel formed from the precursor solution containing sulfuric acid at pH 2.4 to 750°C approaches zero while this ratio in the zirconia formed by pyrolyzing the gel formed from the precursor solution containing nitric acid at pH 1.4 to 825°C is 0.7. |
| Databáze: | OpenAIRE |
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