Preparation and characterization of alkoxy-derived metastable cubic ZrO2 powders

Huey Chang Wang, Kwang-Lung Lin

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Ultrafine alkoxy-derived ZrO2 powders have been prepared from the hydrolysis of zirconium n-butoxides with NaOH aqueous solutions of different pH values (pH 11, 13 and 13.7). The powders crystallize to form cubic phase at around 500°C and transform to tetragonal and monoclinic phases at around 900°C. Experimental results show that Na+ ions might be electrostatically trapped into the polymerized network structures by the Zr(OBU)3O- species which were formed in basic solutions. The trapped Na+ ions may act as nucleation catalysts, and the presence of Na+ is indeed necessary for stabilizing the cubic ZrO2 powders. The formation of needle-like monoclinic crystallites is attributed to the migration of ultrafine particles resulting from the evolution of sodium.

Original languageEnglish
Pages (from-to)249-255
Number of pages7
JournalMaterials Science and Engineering A
Volume147
Issue number2
DOIs
Publication statusPublished - 1991 Nov 15

Fingerprint

Powders
preparation
Trapped ions
Crystallites
Zirconium
needles
Needles
crystallites
hydrolysis
Hydrolysis
ions
Nucleation
Sodium
sodium
nucleation
Ions
aqueous solutions
catalysts
Catalysts
alkoxyl radical

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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abstract = "Ultrafine alkoxy-derived ZrO2 powders have been prepared from the hydrolysis of zirconium n-butoxides with NaOH aqueous solutions of different pH values (pH 11, 13 and 13.7). The powders crystallize to form cubic phase at around 500°C and transform to tetragonal and monoclinic phases at around 900°C. Experimental results show that Na+ ions might be electrostatically trapped into the polymerized network structures by the Zr(OBU)3O- species which were formed in basic solutions. The trapped Na+ ions may act as nucleation catalysts, and the presence of Na+ is indeed necessary for stabilizing the cubic ZrO2 powders. The formation of needle-like monoclinic crystallites is attributed to the migration of ultrafine particles resulting from the evolution of sodium.",
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Preparation and characterization of alkoxy-derived metastable cubic ZrO2 powders. / Wang, Huey Chang; Lin, Kwang-Lung.

In: Materials Science and Engineering A, Vol. 147, No. 2, 15.11.1991, p. 249-255.

Research output: Contribution to journalArticle

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