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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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Impedance Spectroscopy of (Bi1/2Na1/2)TiO3-BaTiO3 Ceramics Modified with ( K0.5Na0.5)NbO3

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Title
Impedance Spectroscopy of (Bi1/2Na1/2)TiO3-BaTiO3 Ceramics Modified with ( K0.5Na0.5)NbO3
Author
Zang, JiadongLi, MingSinclair, Derek C.Jo, WookRoedel, Juergen
Keywords
FREE PIEZOELECTRIC CERAMICS; LEAD-FREE PIEZOCERAMICS; RELAXOR FERROELECTRICS; MODULUS SPECTROSCOPY; SYSTEM; PERSPECTIVE
Issue Date
2014-05
Publisher
WILEY-BLACKWELL
Citation
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.97, no.5, pp.1523 - 1529
Abstract
The electrical and dielectric properties of (1-x)(0.94Bi(1/2)Na(1/2)TiO(3)-0.06BaTiO(3))-x(K0.5Na0.5NbO3) with x=0, 0.03, 0.09, 0.18 have been investigated by impedance spectroscopy over a wide temperature range. The dc conductivity of the ceramics follows the Arrhenius law with an activation energy ranging from similar to 1.20 to 1.50eV. Measurements under different atmospheres show the materials exhibit n-type semiconducting behavior at elevated temperatures. The presence of a highly polarizable phase for all compositions is revealed by electric modulus (M) spectra. The Burns temperature decreases with increasing KNN content. The change in temperature-dependent permittivity with composition is explained by the difference in thermal evolution of polar nanoregions induced by the addition of KNN.
URI
https://scholarworks.unist.ac.kr/handle/201301/7208
DOI
10.1111/jace.12804
ISSN
0002-7820
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MSE_Journal Papers
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