On the occurrence of a metastable tetragonal t′-phase in a ZrO<SUB>2</SUB> −13.6 mole % MgO ceramic and its microscopic thermal evolution

The time-differential perturbed angular correlation technique has been used to investigate the thermal behavior of a ZrO 2 −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 o...

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Autores principales: Caracoche, María Cristina, Rivas, Patricia Claudia, Pasquevich, Alberto Felipe, López García, Alberto Raúl, Aglietti, Esteban Fausto, Scian, Alberto Néstor
Formato: Articulo
Lenguaje:Inglés
Publicado: 1993
Materias:
Ciencias Exactas
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/139519
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-139519
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
spellingShingle Ciencias Exactas
Caracoche, María Cristina
Rivas, Patricia Claudia
Pasquevich, Alberto Felipe
López García, Alberto Raúl
Aglietti, Esteban Fausto
Scian, Alberto Néstor
On the occurrence of a metastable tetragonal t′-phase in a ZrO<SUB>2</SUB> −13.6 mole % MgO ceramic and its microscopic thermal evolution
topic_facet Ciencias Exactas
description The time-differential perturbed angular correlation technique has been used to investigate the thermal behavior of a ZrO 2 −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 -ZrO 2 tetragonal phase and the other one has been interpreted as describing a high-MgO-content nontransformable t '–ZrO 2 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 ZrO 2 . 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.
format Articulo
Articulo
author Caracoche, María Cristina
Rivas, Patricia Claudia
Pasquevich, Alberto Felipe
López García, Alberto Raúl
Aglietti, Esteban Fausto
Scian, Alberto Néstor
author_facet Caracoche, María Cristina
Rivas, Patricia Claudia
Pasquevich, Alberto Felipe
López García, Alberto Raúl
Aglietti, Esteban Fausto
Scian, Alberto Néstor
author_sort Caracoche, María Cristina
title On the occurrence of a metastable tetragonal t′-phase in a ZrO<SUB>2</SUB> −13.6 mole % MgO ceramic and its microscopic thermal evolution
title_short On the occurrence of a metastable tetragonal t′-phase in a ZrO<SUB>2</SUB> −13.6 mole % MgO ceramic and its microscopic thermal evolution
title_full On the occurrence of a metastable tetragonal t′-phase in a ZrO<SUB>2</SUB> −13.6 mole % MgO ceramic and its microscopic thermal evolution
title_fullStr On the occurrence of a metastable tetragonal t′-phase in a ZrO<SUB>2</SUB> −13.6 mole % MgO ceramic and its microscopic thermal evolution
title_full_unstemmed On the occurrence of a metastable tetragonal t′-phase in a ZrO<SUB>2</SUB> −13.6 mole % MgO ceramic and its microscopic thermal evolution
title_sort on the occurrence of a metastable tetragonal t′-phase in a zro<sub>2</sub> −13.6 mole % mgo ceramic and its microscopic thermal evolution
publishDate 1993
url http://sedici.unlp.edu.ar/handle/10915/139519
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