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Jurgen Rodel – One of the best experts on this subject based on the ideXlab platform.

  • lead free high temperature dielectrics with wide operational range
    Journal of Applied Physics, 2011
    Co-Authors: Robert Dittmer, Dragan Damjanovic, Jurgen Rodel
    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 (e) 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 e/e150 °C varying no more than ±10% from 43 to 319 °C. With very good electrical properties …

  • Lead-free high-temperature dielectrics with wide operational range
    Journal of Applied Physics, 2011
    Co-Authors: Robert Dittmer, Dragan Damjanovic, Jurgen Rodel
    Abstract:

    The dielectric, electrical and structural properties of (1-x) (0.94Bi(1/2)Na(1/2)TiO(3)-0.06BaTiO(3))-xK(0.5)Na(0.5)NbO(3) (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 degrees C. Temperature dependent dielectric Permittivity (epsilon) 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 similar to 300 degrees 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 similar to 2150 at the frequency of 1 kHz at 150 degrees C with a normalized Permittivity epsilon/epsilon(150 degrees C) varying no more than +/- 10% from 43 to 319 degrees C. With very good electrical properties persisting up to 300 degrees C, i.e., a resistivity on the order of magnitude of 10(8) Omega 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.open343

Robert Dittmer – One of the best experts on this subject based on the ideXlab platform.

  • lead free high temperature dielectrics with wide operational range
    Journal of Applied Physics, 2011
    Co-Authors: Robert Dittmer, Dragan Damjanovic, Jurgen Rodel
    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 (e) 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 e/e150 °C varying no more than ±10% from 43 to 319 °C. With very good electrical properties …

  • Lead-free high-temperature dielectrics with wide operational range
    Journal of Applied Physics, 2011
    Co-Authors: Robert Dittmer, Dragan Damjanovic, Jurgen Rodel
    Abstract:

    The dielectric, electrical and structural properties of (1-x) (0.94Bi(1/2)Na(1/2)TiO(3)-0.06BaTiO(3))-xK(0.5)Na(0.5)NbO(3) (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 degrees C. Temperature dependent dielectric Permittivity (epsilon) 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 similar to 300 degrees 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 similar to 2150 at the frequency of 1 kHz at 150 degrees C with a normalized Permittivity epsilon/epsilon(150 degrees C) varying no more than +/- 10% from 43 to 319 degrees C. With very good electrical properties persisting up to 300 degrees C, i.e., a resistivity on the order of magnitude of 10(8) Omega 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.open343

Dragan Damjanovic – One of the best experts on this subject based on the ideXlab platform.

  • lead free high temperature dielectrics with wide operational range
    Journal of Applied Physics, 2011
    Co-Authors: Robert Dittmer, Dragan Damjanovic, Jurgen Rodel
    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 (e) 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 e/e150 °C varying no more than ±10% from 43 to 319 °C. With very good electrical properties …

  • Lead-free high-temperature dielectrics with wide operational range
    Journal of Applied Physics, 2011
    Co-Authors: Robert Dittmer, Dragan Damjanovic, Jurgen Rodel
    Abstract:

    The dielectric, electrical and structural properties of (1-x) (0.94Bi(1/2)Na(1/2)TiO(3)-0.06BaTiO(3))-xK(0.5)Na(0.5)NbO(3) (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 degrees C. Temperature dependent dielectric Permittivity (epsilon) 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 similar to 300 degrees 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 similar to 2150 at the frequency of 1 kHz at 150 degrees C with a normalized Permittivity epsilon/epsilon(150 degrees C) varying no more than +/- 10% from 43 to 319 degrees C. With very good electrical properties persisting up to 300 degrees C, i.e., a resistivity on the order of magnitude of 10(8) Omega 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.open343