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Impedance Spectroscopy of (Bi1/2Na1/2)TiO3-BaTiO3Based High-Temperature Dielectrics

Zang, Jiadong ; Li, Ming ; Sinclair, Derek C. ; Frömling, Till ; Jo, Wook ; Rödel, Jürgen ; Johnson, D. (2014)
Impedance Spectroscopy of (Bi1/2Na1/2)TiO3-BaTiO3Based High-Temperature Dielectrics.
In: Journal of the American Ceramic Society, 97 (9)
doi: 10.1111/jace.13012
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

The dielectric properties of CaZrO3 (CZ) modified 0.94Bi1/2Na1/2TiO3 (BNT)–0.06BaTiO3 (BT) and 0.82(0.94BNT–0.06BT)–0.18(K1/2Na1/2)NbO3 have been investigated by impedance spectroscopy over a wide temperature range. The presence of a highly polarizable phase in addition to a bulk response is revealed by electric modulus (M″) spectra in both systems. The relaxation frequency of the polar phase follows the Vogel–Fulcher law below the Burns temperature which decreases with increasing CZ content. The dc conductivity of the ceramics is dominated by the bulk response which follows the Arrhenius law with an activation energy ranging from 1.4 to 1.7 eV and has an oxygen partial pressure dependence consistent with n-type semiconductivity. This information is pertinent to on-going compositional development of relaxor-based high-temperature dielectrics.

Typ des Eintrags: Artikel
Erschienen: 2014
Autor(en): Zang, Jiadong ; Li, Ming ; Sinclair, Derek C. ; Frömling, Till ; Jo, Wook ; Rödel, Jürgen ; Johnson, D.
Art des Eintrags: Bibliographie
Titel: Impedance Spectroscopy of (Bi1/2Na1/2)TiO3-BaTiO3Based High-Temperature Dielectrics
Sprache: Englisch
Publikationsjahr: September 2014
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of the American Ceramic Society
Jahrgang/Volume einer Zeitschrift: 97
(Heft-)Nummer: 9
DOI: 10.1111/jace.13012
Kurzbeschreibung (Abstract):

The dielectric properties of CaZrO3 (CZ) modified 0.94Bi1/2Na1/2TiO3 (BNT)–0.06BaTiO3 (BT) and 0.82(0.94BNT–0.06BT)–0.18(K1/2Na1/2)NbO3 have been investigated by impedance spectroscopy over a wide temperature range. The presence of a highly polarizable phase in addition to a bulk response is revealed by electric modulus (M″) spectra in both systems. The relaxation frequency of the polar phase follows the Vogel–Fulcher law below the Burns temperature which decreases with increasing CZ content. The dc conductivity of the ceramics is dominated by the bulk response which follows the Arrhenius law with an activation energy ranging from 1.4 to 1.7 eV and has an oxygen partial pressure dependence consistent with n-type semiconductivity. This information is pertinent to on-going compositional development of relaxor-based high-temperature dielectrics.

Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Nichtmetallisch-Anorganische Werkstoffe
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften
Hinterlegungsdatum: 08 Sep 2014 09:19
Letzte Änderung: 08 Sep 2014 09:19
PPN:
Sponsoren: Deutsche Forschungsgemeinschaft. Grant Number: RO 954/22, Engineering and Physical Sciences Research Council. Grant Number: EP/G005001/1
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