Crystallization exotherms of zirconia-hafnia mixtures

Journal Article · Fri Jun 01 00:00:00 EDT 1990 · Journal of the American Ceramic Society; (USA)

DOI:https://doi.org/10.1111/j.1151-2916.1990.tb09833.x· OSTI ID:6436826

Srinivasan, R; Davis, B H ^[1]

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1. Kentucky Univ., Lexington, KY (USA). Center for Applied Energy Research

This paper reports differential scanning calorimetry used to study the crystallization behavior of ZrO{sub 2}-HfO{sub 2} mixtures. The materials prepared by admixing Zr(No{sub 3}){sub 4} and Hf(NO{sub 3}){sub 4} exhibited a peak at 40 wt% Hf composition in the exothermic-heat-versus-mixed-oxide composition curve. In contrast, the materials prepared by precipitation from a solution prepared from anhydrous HfCl{sub 4} and ZrCl{sub 4} exhibited a gradual decrease in exothermic behavior with increasing Hf content. The temperature for the exotherm increased with increasing Hf content. The data indicate that the exotherm is due to the formation of a crystalline material and not due to a phase transformation.

• OSTI ID: 6436826
• Journal Information: Journal of the American Ceramic Society; (USA), Journal Name: Journal of the American Ceramic Society; (USA) Vol. 73:6; ISSN JACTA; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
CALORIMETRY
CHALCOGENIDES
COPRECIPITATION
CRYSTALLIZATION
DIFFERENTIAL THERMAL ANALYSIS
DISPERSIONS
HAFNIUM COMPOUNDS
HAFNIUM OXIDES
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PRECIPITATION
REFRACTORY METAL COMPOUNDS
SEPARATION PROCESSES
SOLID SOLUTIONS
SOLUTIONS
THERMAL ANALYSIS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES