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Jo, Wook
Sustainable Functional Ceramics Lab
Research Interests
  • Lead-free piezoceramics, ultra - low temperature sintering, ferroelectrics, relaxor ferroelectrics, 2D materials, magnetoelectric materials, multiferroics

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High-temperature dielectrics in CaZrO3-modified Bi1/2Na1/2TiO3-based lead-free ceramics

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Title
High-temperature dielectrics in CaZrO3-modified Bi1/2Na1/2TiO3-based lead-free ceramics
Author
Acosta, MatiasZang, JiadongJo, WookRoedel, Juergen
Keywords
Capacitors; Dielectric properties; Electrical conductivity; Ferroelectric properties; Relaxor
Issue Date
2012-12
Publisher
ELSEVIER SCI LTD
Citation
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, v.32, no.16, pp.4327 - 4334
Abstract
Materials in two composition regimes, Bi1/2Na1/2TiO3-BaTiO3-CaZrO3 (BNT-BT-CZ) and Bi1/2Na1/2TiO3-BaTiO3-K0.5Na0.5NbO3-CaZrO3 (BNT-BT-KNN-CZ), were synthesized via the mixed oxide route and their structural, dielectric and electrical properties were investigated. CZ was identified to render the two local maxima in permittivity more diffused. This resulted in temperature-insensitive relative permittivity spectra with average values from similar to 470 up to similar to 2300 and operational windows of at least similar to 400 degrees C with less than 15% of variation in the temperature range from -100 up to above 500 degrees C. Moreover, loss factors are below similar to 10% and RC constants range from similar to 0.03 s up to similar to 4 s at 300 degrees C. The materials of current investigation are highly attractive for developing capacitors of wide temperature usage.
URI
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DOI
10.1016/j.jeurceramsoc.2012.06.011
ISSN
0955-2219
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MSE_Journal Papers
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