Room Temperature Polymorphism in Metastable BiMnO3 Prepared by High-Pressure Synthesis (Articolo in rivista)

Type
Label
  • Room Temperature Polymorphism in Metastable BiMnO3 Prepared by High-Pressure Synthesis (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/cm048250s (literal)
Alternative label
  • Montanari E., Righi L., Calestani G., Migliori A., Gilioli E., Bolzoni F. (2005)
    Room Temperature Polymorphism in Metastable BiMnO3 Prepared by High-Pressure Synthesis
    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., Righi L., Calestani G., Migliori A., Gilioli E., Bolzoni F. (literal)
Pagina inizio
  • 1765 (literal)
Pagina fine
  • 1773 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://pubs.acs.org/doi/abs/10.1021/cm048250s (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 17 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 7 (literal)
Note
  • ISI Web of Science (WOS) (literal)
  • Scopu (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Parma, Dipartimento Chim Gen Inorgan, I-43100 Parma, Italy; CNR, IMM, Area Ric Bologna, I-40126 Bologna, Italy; Univ Milan, Dipartimento Sci Terra, I-20133 Milan, Italy; CNR, IMEM, I-43010 Parma, Italy (literal)
Titolo
  • Room Temperature Polymorphism in Metastable BiMnO3 Prepared by High-Pressure Synthesis (literal)
Abstract
  • The multiferroic perovskite BiMnO3, synthesized under high-pressure conditions, decomposes if heated at room-pressure in the temperature range of 500-650 degrees C. Comparative studies by high-temperature X-ray diffraction, electron diffraction, thermal analysis, and magnetic investigation revealed the existence of a complex pathway to decomposition, depending on the heating rate, pressure, and atmosphere that involves different metastable phases. In particular the as-prepared monoclinic phase (I) transforms to a second monoclinic form (II) at 210 degrees C and then to an orthorhombic phase (III) at 490 degrees C. These phase transitions, fast and reversible, occur on heating with a drop in volume and are moved at higher temperatures when pressure is decreased. The transition from II to III, typically observed in inert atmosphere, can be detected also in air when the heating rate is kept sufficiently high. When III is heated in an oxygen-containing atmosphere a slow irreversible transition to variants IV and then V takes place with kinetics depending on temperature, heating rate, and oxygen partial pressure. Both IV and V are oxidized ferromagnetic phases containing Mn4+ characterized by a modulated structure based on fundamental triclinic perovskite cells. Their magnetic behavior shows a strong analogy with thin films of BiMnO3, suggesting for the latter an oxidized nature and for the former a possible multiferroic behavior. (literal)
Editore
Prodotto di
Autore CNR

Incoming links:


Autore CNR di
Prodotto
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi
Editore di
data.CNR.it