Hydrothermal Crystallization Kinetics of m-ZrO2 and t-ZrO2

Raymond P. Denkewicz, Kevor S. TenHuisen, James Hansell Adair

Research output: Contribution to journalArticle

119 Citations (Scopus)

Abstract

The isothermal nucleation and crystallization kinetics of hydrothermally prepared monoclinic and tetragonal ZrO2 have been determined at various pH conditions. It is shown that monoclinic ZrO2 precipitates at low pH whereas at high pH tetragonal ZrO2 crystallizes from an amorphous zirconium (hydrous) oxide, Zr(OH)xOy, precursor. At intermediate pH conditions mixtures of the polymorphs are formed suggestive of kinetically competing particle formation mechanisms. The data are explained by the proposed existence of three controlling regimes for the formation of crystalline ZrO2: dissolution/precipitation at low pH, a solubility controlled regime at intermediate pH values, and a gel structure controlled regime at high pH. Apparent activation energies for the nucleation and crystallization of monoclinic and tetragonal ZrO2 formed under hydrothermal conditions are presented.

Original languageEnglish (US)
Pages (from-to)2698-2705
Number of pages8
JournalJournal of Materials Research
Volume5
Issue number11
DOIs
StatePublished - Jan 1 1990

Fingerprint

Crystallization kinetics
Nucleation
crystallization
kinetics
Crystallization
Polymorphism
Zirconia
Precipitates
Dissolution
Gels
Solubility
Activation energy
Crystalline materials
nucleation
zirconium oxides
precipitates
dissolving
solubility
gels
activation energy

All Science Journal Classification (ASJC) codes

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

Cite this

Denkewicz, Raymond P. ; TenHuisen, Kevor S. ; Adair, James Hansell. / Hydrothermal Crystallization Kinetics of m-ZrO2 and t-ZrO2 In: Journal of Materials Research. 1990 ; Vol. 5, No. 11. pp. 2698-2705.
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Hydrothermal Crystallization Kinetics of m-ZrO2 and t-ZrO2 . / Denkewicz, Raymond P.; TenHuisen, Kevor S.; Adair, James Hansell.

In: Journal of Materials Research, Vol. 5, No. 11, 01.01.1990, p. 2698-2705.

Research output: Contribution to journalArticle

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T1 - Hydrothermal Crystallization Kinetics of m-ZrO2 and t-ZrO2

AU - Denkewicz, Raymond P.

AU - TenHuisen, Kevor S.

AU - Adair, James Hansell

PY - 1990/1/1

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N2 - The isothermal nucleation and crystallization kinetics of hydrothermally prepared monoclinic and tetragonal ZrO2 have been determined at various pH conditions. It is shown that monoclinic ZrO2 precipitates at low pH whereas at high pH tetragonal ZrO2 crystallizes from an amorphous zirconium (hydrous) oxide, Zr(OH)xOy, precursor. At intermediate pH conditions mixtures of the polymorphs are formed suggestive of kinetically competing particle formation mechanisms. The data are explained by the proposed existence of three controlling regimes for the formation of crystalline ZrO2: dissolution/precipitation at low pH, a solubility controlled regime at intermediate pH values, and a gel structure controlled regime at high pH. Apparent activation energies for the nucleation and crystallization of monoclinic and tetragonal ZrO2 formed under hydrothermal conditions are presented.

AB - The isothermal nucleation and crystallization kinetics of hydrothermally prepared monoclinic and tetragonal ZrO2 have been determined at various pH conditions. It is shown that monoclinic ZrO2 precipitates at low pH whereas at high pH tetragonal ZrO2 crystallizes from an amorphous zirconium (hydrous) oxide, Zr(OH)xOy, precursor. At intermediate pH conditions mixtures of the polymorphs are formed suggestive of kinetically competing particle formation mechanisms. The data are explained by the proposed existence of three controlling regimes for the formation of crystalline ZrO2: dissolution/precipitation at low pH, a solubility controlled regime at intermediate pH values, and a gel structure controlled regime at high pH. Apparent activation energies for the nucleation and crystallization of monoclinic and tetragonal ZrO2 formed under hydrothermal conditions are presented.

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