Gerhard Gritzner, Andreas Pissenberger,
"Dielectric properties of Bi2PbNb2O9 ceramics prepared by different techniques"
, in Applied Physics A, Vol. 87, Seite(n) 807?811, 2007, ISSN: 1432-0630
Original Titel:
Dielectric properties of Bi2PbNb2O9 ceramics prepared by different techniques
Sprache des Titels:
Englisch
Original Kurzfassung:
Different techniques for the synthesis of Bi2PbNb2O9, namely the mixed oxide technique, molten salt synthesis, hydro-thermal synthesis, co-precipitation and the tartaric acid gel method were investigated and the results on the dielectric properties are reported. The heat-treatment of the precursor powders was the same for all precursor powders. Sintering at 1 040 °C under ambient pressure resulted in polycrystalline specimens, while "hot-forging" at 1 040 °C with a pressure of 20 MPa produced c-axis aligned samples. Phase composition and crystallite orientation of the sintered bodies were analyzed by X ray diffraction. Single-phase material was obtained in all cases. "Hot-forging" not only yielded c-axis orientation, but also increased the relative densities above 99.4 %. The relative permittivity decreased for c-axis oriented material compared to polycrystalline ceramics. Values for the relative permittivity for the "hot-forged" specimens at 100 °C at 100 kHz varied between 165 and 250, depending on the fabrication method. The Curie temperature for the c-axis aligned samples was 568 °C, independent of the nature of the precursor powders.
Sprache der Kurzfassung:
Englisch
Englische Kurzfassung:
Different techniques for the synthesis of Bi2PbNb2O9, namely the mixed oxide technique, molten salt synthesis, hydro-thermal synthesis, co-precipitation and the tartaric acid gel method were investigated and the results on the dielectric properties are reported. The heat-treatment of the precursor powders was the same for all precursor powders. Sintering at 1 040 °C under ambient pressure resulted in polycrystalline specimens, while "hot-forging" at 1 040 °C with a pressure of 20 MPa produced c-axis aligned samples. Phase composition and crystallite orientation of the sintered bodies were analyzed by X ray diffraction. Single-phase material was obtained in all cases. "Hot-forging" not only yielded c-axis orientation, but also increased the relative densities above 99.4 %. The relative permittivity decreased for c-axis oriented material compared to polycrystalline ceramics. Values for the relative permittivity for the "hot-forged" specimens at 100 °C at 100 kHz varied between 165 and 250, depending on the fabrication method. The Curie temperature for the c-axis aligned samples was 568 °C, independent of the nature of the precursor powders.
Journal:
Applied Physics A
Volume:
87
Seitenreferenz:
807?811
Erscheinungsjahr:
2007
ISSN:
1432-0630
Anzahl der Seiten:
5
Notiz zur Publikation:
Dielectric properties of Bi2PbNb2O9 ceramics prepared by different techniques
Gerhard Gritzner and Andreas Pissenberger
Appl. Phys. A 87 (2007) 807 – 811
Forschungs-