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  • 2000-2004  (2)
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  • 2000-2004  (2)
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  • 1
    Online Resource
    Online Resource
    Correlation among oxygen vacancies in bismuth titanate ferroelectric ceramics
    AIP Publishing ; 2004
    In:  Applied Physics Letters Vol. 85, No. 20 ( 2004-11-15), p. 4717-4719
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 85, No. 20 ( 2004-11-15), p. 4717-4719
    Abstract: Pure Bi4Ti3O12 ceramics were prepared using the conventional solid-state reaction method and their dielectric properties were investigated. A dielectric loss peak with the relaxation-type characteristic was observed at about 370K at 100Hz frequency. This peak was confirmed to be associated with the migration of oxygen vacancies inside ceramics. The Cole–Cole fitting to this peak reveals a strong correlation among oxygen vacancies and this strong correlation is considered to commonly exist among oxygen vacancies in ferroelectrics. Therefore, the migration of oxygen vacancies in ferroelectric materials would demonstrate a collective behavior instead of an individual one due to this strong correlation. Furthermore, this correlation is in proportion to the concentration and in inverse proportion to the activation energy of oxygen vacancies. These results could be helpful to the understanding of the fatigue mechanisms in ferroelectric materials.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.1823583
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2004
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Preparation and characterization of nanocrystalline PbSe in poly(acrylic acid- co -styrene)
    Springer Science and Business Media LLC ; 2001
    In:  Journal of Materials Research Vol. 16, No. 10 ( 2001-10), p. 2922-2927
    Details
    In: Journal of Materials Research, Springer Science and Business Media LLC, Vol. 16, No. 10 ( 2001-10), p. 2922-2927
    Abstract: The in situ reduction method was used to prepare nanocrystalline PbSe in a poly(acrylic acid- co -styrene) matrix. Metal precursor-doped polymer film was treated with selenium and reducing reagent (NaBH 4 ) in ethylenediamine, leading to the formation of assemblies of crystalline semiconductive PbSe in polymer. The preparation was done at room temperature and ambient pressure. X-ray diffraction, x-ray photoelectron spectroscopy, infrared, scanning electron microscopy, transmission electron microscopy, and ultraviolet-visible spectra were used to characterize the as-prepared materials. The key factor for successful preparation of this composite was also discussed.
    Type of Medium: Online Resource
    ISSN: 0884-2914 , 2044-5326
    URL: Article
    DOI: 10.1557/JMR.2001.0401
    RVK:
    VA 5350
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2001
    detail.hit.zdb_id: 54876-5
    detail.hit.zdb_id: 2015297-8
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