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Title

Microstructure and texture dependence of the dielectric anomalies and dc conductivity of Bi3TiNbO9 ferroelectric ceramics

AuthorsMoure Arroyo, Alberto CSIC ORCID; Pardo, Lorena CSIC ORCID
KeywordsBismuth compounds
Titanium compounds
Ferroelectric ceramics
Piezoceramics
Grain size
Texture
Sintering
Hot pressing
Issue Date7-Apr-2005
PublisherAmerican Institute of Physics
CitationJournal of Applied Physics 97(8): 084103 (2005)
AbstractCeramics of composition Bi3TiNbO9 (BTN) and perovskite-layered structure (Aurivillius type) [B. Aurivillius, Ark. Kemi 1, 463 (1949)] were processed by natural sintering and hot pressing from amorphous precursors. Precursors were obtained by mechanochemical activation of stoichiometric mixtures of oxides. These materials are in general interesting for their use as high-temperature piezoelectrics. Among them, BTN possesses the highest ferroparaelectric phase-transition temperature (>900 °C). The transition temperature establishes the working limit of the ceramic and the electric properties, especially the dc conductivity, affect on its polarizability. In this work, dielectric studies of BTN ceramics with controlled texture and microstructure have been made at 1, 100 KHz, and 1 MHZ and in the temperature range from 200 °C up to the ferroparaelectric transition temperature. Values of ~250 at 200 °C are achieved in ceramics hot pressed at temperatures as low as 700 °C for 1 h.
Description11 pages, 16 figures, 1 table.-- PACS: 81.05.Je; 77.84.Dy; 81.40.Ef; 77.22.Ch; 77.22.Gm; 77.80.Bh; 72.80.Sk; 81.20.Ev; 61.50.Nw; 77.22.Ej
Publisher version (URL)http://dx.doi.org/10.1063/1.1865313
URIhttp://hdl.handle.net/10261/21737
DOI10.1063/1.1865313
ISSN0021-8979
Appears in Collections:(ICMM) Artículos

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