High-temperature polymorphism in metastable BiMnO3 (Articolo in rivista)

Type
Label
  • High-temperature polymorphism in metastable BiMnO3 (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/cm051576w (literal)
Alternative label
  • Montanari E. a; Calestani G. a; Migliori A. b; Dapiaggi M. c; Bolzoni F. d; Cabassi R. d; Gilioli E. d (2005)
    High-temperature polymorphism in metastable BiMnO3
    in Chemistry of materials; ACS, American chemical society, Washington, DC (Stati Uniti d'America)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Montanari E. a; Calestani G. a; Migliori A. b; Dapiaggi M. c; Bolzoni F. d; Cabassi R. d; Gilioli E. d (literal)
Pagina inizio
  • 6457 (literal)
Pagina fine
  • 6467 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 17 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 25 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • a Univ Parma, Dipartimento Chim, GIAF, I-43100 Parma, Italy; b CNR, IMM, Area Ric Bologna, I-40126 Bologna, Italy; c Univ Milan, Dipartimento Sci Terra, I-20133 Milan, Italy; d CNR, IMEM, I-43010 Parma, Italy (literal)
Titolo
  • High-temperature polymorphism in metastable BiMnO3 (literal)
Abstract
  • The BiMnO3 perovskite is a very interesting multiferroic material that, once synthesized at high pressure and high temperature, survives as a metastable phase at ambient conditions. We investigated ceramic samples prepared in different conditions (temperature, pressure, and composition), and the existence of polymorphism at room temperature was clearly evidenced by electron diffraction and high-resolution electron microscopy in all the samples. A new polymorph, characterized by a different distortion of the perovskite basic cell, was found to coexist as a minor phase with the well-known C2 monoclinic form. The new polymorph, which can be described by a triclinic (pseudorhombohedral) superstructure with a = 13.62 angstrom, b = 13.66 angstrom, c = 13.66 angstrom, alpha = 110.0 degrees, beta = 108.8 degrees, and gamma = 108.8 degrees, is mostly segregated at the grain surface. Magnetic characterizations revealed for this second form a critical temperature of 107 K, a few degrees above the ferromagnetic transition of the monoclinic C2 form measured at 99 K. The new phase disappears by reheating the samples at ambient pressure, suggesting the idea of a higher energy polymorph, which kinetically converts in the usual phase once a sufficient temperature has been achieved. (literal)
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