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On the occurrence of a metastable tetragonal t′-phase in a ZrO2−13.6 mole % MgO ceramic and its microscopic thermal evolution

Published online by Cambridge University Press:  31 January 2011

M.C. Caracoche ,
P.C. Rivas ,
A.F. Pasquevich ,
A.R. López García ,
E. Aglietti  and
A. Scian
M.C. Caracoche
Affiliation:
Departamento de Física, UNLP, C. C.NO 67, 1900 La Plata, Argentina
P.C. Rivas
Affiliation:
Departamento de Física, UNLP, C. C.NO 67, 1900 La Plata, Argentina
A.F. Pasquevich
Affiliation:
Departamento de Física, UNLP, C. C.NO 67, 1900 La Plata, Argentina
A.R. López García
Affiliation:
Departamento de Física, UNLP, C. C.NO 67, 1900 La Plata, Argentina
E. Aglietti
Affiliation:
Centro de Tecnología en Recursos Minerales y Cerámica, C. C. NO 49, 1897 M.B. Gonnet, Argentina
A. Scian
Affiliation:
Centro de Tecnología en Recursos Minerales y Cerámica, C. C. NO 49, 1897 M.B. Gonnet, Argentina
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Abstract

The time-differential perturbed angular correlation technique has been used to investigate the thermal behavior of a ZrO2−13.6 mole % MgO ceramic between room temperature and 1423 K. Two different quadrupole hyperfine interactions corresponding to a tetragonal structure have been found to result on cooling the ceramic from the single-phase cubic field. One of them agrees with that depicting the pure t-ZrO2 tetragonal phase and the other one has been interpreted as describing a high-MgO-content nontransformable t'–ZrO2 phase. As temperature increases, the latter gives rise to a similar but fluctuating interaction related to the oxygen vacancies mobility and which shows a thermal behavior analogous to that already reported for the stabilized cubic ZrO2. Above 1100 K these dynamic t'-sites transform into pure tetragonal ones which behave ordinarily, suffering the t → m phase transition when cooling to room temperature. Differences found between TDPAC results and information drawn from other techniques are discussed.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 3 , March 1993 , pp. 605 - 610
Copyright
Copyright © Materials Research Society 1993

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References

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