Structural Characterization of High-Temperature Zirconia Ceramics by Perturbed Angular Correlation Spectroscopy |
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| Authors: | HERBERT JAEGER JOHN A GARDNER JOHN C HAYGARTH ROBERT L RASERA |
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| Affiliation: | Department of Physics, Oregon State University, Corvallis, Oregon 97331;Teledyne Wah Chang Albany, Albany, Oregon 97321;Department of Physics, University of Maryland Baltimore County, Catonsville, Maryland 21228 |
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| Abstract: | Perturbed angular correlation spectra of γ-rays emitted following the decay of dilute 181Hf in several zirconia ceramics are reported. Spectra for monoclinic and tetragonal zirconia, a tetragonal zirconia/yttria alloy, a cubic zirconia/yttria alloy, and two mixed tetragonal/cubic-phase zirconia/yttria alloys were measured as a function of temperature to 1470°C. The spectrum observed for each phase has a unique signature, and the spectrum of mixed-phase materials can be used to determine the relative amounts of the different phases. These data give a cubic/(cubic + tetragonal) phase boundary that is somewhat lower in temperature than indicated by current phase diagrams. |
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