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Lead-free high-temperature dielectrics with wide operational range

Dittmer, Robert ; Jo, Wook ; Damjanovic, Dragan ; Rödel, Jürgen :
Lead-free high-temperature dielectrics with wide operational range.
[Online-Edition: http://dx.doi.org/10.1063/1.3544481]
In: Journal of Applied Physics, 109 (3) 034107-1. ISSN 00218979
[Artikel], (2011)
Note:

SFB 595 A1

Dies ist die neueste Version dieses Eintrags.

Offizielle URL: http://dx.doi.org/10.1063/1.3544481

Kurzbeschreibung (Abstract)

The dielectric, electrical and structural properties of (1–x)(0.94Bi1/2Na1/2TiO3–0.06BaTiO3)–xK0.5Na0.5NbO3 (BNT–BT–xKNN) with x = 0.09, 0.12, 0.15, and 0.18 were investigated as potential candidates for high-temperature capacitors with a working temperature far beyond 200 °C. Temperature dependent dielectric permittivity (ε) showed two local broad maxima that at the optimal composition of KNN (x = 0.18) are combined to form a plateau. This then results in a highly temperature-insensitive permittivity up to ∼ 300 °C at the expense of a small reduction in absolute permittivity values. High-temperature in situ x-ray diffraction study showed pseudocubic symmetry without obvious structural changes, which implies that the dielectric anomalies observed could only be a consequence of a slight change in space group. BNT–BT–0.18KNN showed a permittivity of ∼ 2150 at the frequency of 1 kHz at 150 °C with a normalized permittivity ε/ε150 °C varying no more than ±10% from 43 to 319 °C. With very good electrical properties persisting up to 300 °C, i.e., a resistivity on the order of magnitude of 108 Ω m and the RC constant of about 1 s, the examined BNT–BT–xKNN compositions present a good starting point for the development of high-temperature capacitor materials.

Typ des Eintrags: Artikel
Erschienen: 2011
Autor(en): Dittmer, Robert ; Jo, Wook ; Damjanovic, Dragan ; Rödel, Jürgen
Titel: Lead-free high-temperature dielectrics with wide operational range
Sprache: Englisch
Kurzbeschreibung (Abstract):

The dielectric, electrical and structural properties of (1–x)(0.94Bi1/2Na1/2TiO3–0.06BaTiO3)–xK0.5Na0.5NbO3 (BNT–BT–xKNN) with x = 0.09, 0.12, 0.15, and 0.18 were investigated as potential candidates for high-temperature capacitors with a working temperature far beyond 200 °C. Temperature dependent dielectric permittivity (ε) showed two local broad maxima that at the optimal composition of KNN (x = 0.18) are combined to form a plateau. This then results in a highly temperature-insensitive permittivity up to ∼ 300 °C at the expense of a small reduction in absolute permittivity values. High-temperature in situ x-ray diffraction study showed pseudocubic symmetry without obvious structural changes, which implies that the dielectric anomalies observed could only be a consequence of a slight change in space group. BNT–BT–0.18KNN showed a permittivity of ∼ 2150 at the frequency of 1 kHz at 150 °C with a normalized permittivity ε/ε150 °C varying no more than ±10% from 43 to 319 °C. With very good electrical properties persisting up to 300 °C, i.e., a resistivity on the order of magnitude of 108 Ω m and the RC constant of about 1 s, the examined BNT–BT–xKNN compositions present a good starting point for the development of high-temperature capacitor materials.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of Applied Physics
Band: 109
(Heft-)Nummer: 3
Freie Schlagworte: barium compounds, bismuth compounds, ceramics, crystal symmetry, dielectric materials, electrical resistivity, permittivity, potassium compounds, sodium compounds, space groups, X-ray diffraction
Fachbereich(e)/-gebiet(e): Fachbereich Material- und Geowissenschaften
Fachbereich Material- und Geowissenschaften > Materialwissenschaften
Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Nichtmetallisch-Anorganische Werkstoffe
Zentrale Einrichtungen
Zentrale Einrichtungen > Sonderforschungsbereich 595
Zentrale Einrichtungen > Sonderforschungsbereich 595 > A - Synthese
Zentrale Einrichtungen > Sonderforschungsbereich 595 > A - Synthese > A1
Hinterlegungsdatum: 15 Jun 2011 08:13
Offizielle URL: http://dx.doi.org/10.1063/1.3544481
Zusätzliche Informationen:

SFB 595 A1

ID-Nummer: 10.1063/1.3544481
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