Phase transitions and phase diagram of the ferroelectric perovskite (Na0.5Bi0.5)1-xBaxTiO3 by anelastic and dielectric measurements (Articolo in rivista)

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Label
  • Phase transitions and phase diagram of the ferroelectric perovskite (Na0.5Bi0.5)1-xBaxTiO3 by anelastic and dielectric measurements (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.81.144124 (literal)
Alternative label
  • Cordero F. (1); Craciun F. (1); Trequattrini F. (2); Mercadelli E. (3); Galassi C. (3) (2010)
    Phase transitions and phase diagram of the ferroelectric perovskite (Na0.5Bi0.5)1-xBaxTiO3 by anelastic and dielectric measurements
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Cordero F. (1); Craciun F. (1); Trequattrini F. (2); Mercadelli E. (3); Galassi C. (3) (literal)
Pagina inizio
  • 144124 (literal)
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  • http://link.aps.org/doi/10.1103/PhysRevB.81.144124 (literal)
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  • 81 (literal)
Rivista
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  • fasc. (14). The American Physical Society. (literal)
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  • 10 (literal)
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  • 14 (literal)
Note
  • Scopu (literal)
  • ISI Web of Science (WOS) (literal)
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  • (1) CNR-ISC, Istituto dei Sistemi Complessi, Area della Ricerca di Roma-Tor Vergata, Roma, Italy (2) Dipartimento di Fisica, Università di Roma \"La Sapienza\", Roma, Italy (3) CNR-ISTEC, Istituto di Scienza e Tecnologia dei Materiali Ceramici, Faenza, Italy (literal)
Titolo
  • Phase transitions and phase diagram of the ferroelectric perovskite (Na0.5Bi0.5)1-xBaxTiO3 by anelastic and dielectric measurements (literal)
Abstract
  • The complex elastic compliance and dielectric susceptibility of (Na0.5Bi0.5)1-xBaxTiO3 (NBT-BT) have been measured in the composition range between pure NBT and the morphotropic phase boundary included, 0?x?0.08. The compliance of NBT presents sharp peaks at the rhombohedral/tetragonal and tetragonal/cubic transitions, allowing the determination of the tetragonal region of the phase diagram, up to now impossible due to the strong lattice disorder and small distortions and polarizations involved. In spite of ample evidence of disorder and structural heterogeneity, the R-T transition remains sharp up to x=0.06, whereas the T-C transition merges into the diffuse and relaxorlike transition associated with broad maxima of the dielectric and elastic susceptibilities. An attempt is made at relating the different features in the anelastic and dielectric curves to different modes of octahedral rotations and polar cation shifts. The possibility is also considered that the cation displacements locally have monoclinic symmetry, as for PZT near the morphotropic phase boundary. (literal)
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