Hydrogen dissolution in and release from nonmetals. Part 3; Tetragonal zirconia

Journal Article · Tue Jan 01 04:00:00 EST 1991 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1991.tb07299.x· OSTI ID:5057414

Park, K; Olander, D R ^[1]

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1. Materials and Chemical Sciences, Lawrence Berkeley Lab., Univ. of California, Berkeley, CA (US)

The solubility and release kinetics of hydrogen in single-crystal zirconia were investigated by the infusion- extraction method. Equilibration in hydrogen at pressures between 1.4 and 11 atm (0.14 and 1.1 MPa) and at temperatures from 1300{degrees} to 1600{degrees}C produced H/Zr ratios varying from 4 {times} 10{sup {minus}5} to 1.3 {times} 10{sup {minus}4}. Dissolution was exothermic with an enthalpy of solution of 6.6 kcal/mol (28 kJ/mol). The solubility increased with the extent of substoichiometry of the oxide caused by exposure to hydrogen. The solubility behavior and the kinetics of release indicated that hydrogen in the solid forms defect clusters consisting of a hydrogen atom, two trivalent cations, and a doubly charged oxygen vacancy. The trivalent ions were either impurities or reduced zirconium ions. Rate constants for first-order detrapping were determined. Diffusion was shown not to be a rate-limiting process in hydrogen release.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5057414
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 74:1; ISSN 0002-7820; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
CHALCOGENIDES
CHARGED PARTICLES
DEFECTS
DISSOLUTION
ELEMENTS
HYDROGEN
IONS
KINETICS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SOLUBILITY
SUBSTOICHIOMETRY
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM IONS
ZIRCONIUM OXIDES