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Effect of doping and oxygen vacancies on the octahedral tilt transitions in the BaCeO3 perovskite (Articolo in rivista)
- Type
- Label
- Effect of doping and oxygen vacancies on the octahedral tilt transitions in the BaCeO3 perovskite (Articolo in rivista) (literal)
- Anno
- 2010-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1103/PhysRevB.82.104102 (literal)
- Alternative label
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- Cordero F.; Trequattrini F.; Deganello F.; La Parola V.; Roncari E.; Sanson A. (literal)
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- http://link.aps.org/doi/10.1103/PhysRevB.82.104102 (literal)
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- Rivista
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- In: Physical Review B, vol. 82 pp. 104102 -1 - 104102 -7. ©2010 The American Physical Society, 2010. fasc.(10). American Physical Society. (literal)
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- CNR-Istituto dei Sistemi Complessi (ISC), Area della Ricerca di Roma-Tor Vergata, Via del Fosso del Cavaliere 100, I-00133 Roma, Italy
Dip. Fisica, Università di Roma \"La Sapienza\", P.le A. Moro 5, I-00184 Roma, Italy
CNR-Istituto per lo Studio dei Materiali Nanostrutturati (ISMN), Via Ugo La Malfa 153, I-90146 Palermo, Italy
CNR-Istituto di Scienza e Tecnologia dei Materiali Ceramici (ISTEC), Via Granarolo 64, I-48018 Faenza, Italy (literal)
- Titolo
- Effect of doping and oxygen vacancies on the octahedral tilt transitions in the BaCeO3 perovskite (literal)
- Abstract
- We present a systematic study of the effect of Y doping and hydration level on the structural transformations
of BaCeO3 based on anelastic spectroscopy experiments. The temperature of the intermediate transformation
between rhombohedral and orthorhombic Imma phases rises with increasing the molar fraction x of Y roughly
as ?500 K??x in the hydrated state, and is depressed of more than twice that amount after complete dehydration.
This is explained in terms of the effect of doping on the average ?Ce/Y?-O and Ba-O bond lengths, and of lattice relaxation from O vacancies. The different behavior of the transition to the lower temperature Pnma
orthorhombic phase is tentatively explained in terms of progressive flattening of the effective shape of the OH-ion and ordering of the O vacancies during cooling. (literal)
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