Effect of Na on the structural and electrical properties of lead-free sodium potassium niobate ceramics
authors Sharma, S; Kumari, S; Rai, R; Sharma, DK
nationality International
journal INTEGRATED FERROELECTRICS
author keywords KNLN; impedance spectroscopy; activation energy; relaxation time
keywords FREE PIEZOELECTRIC CERAMICS; CONDUCTIVITY; SPECTROSCOPY; IMPEDANCE; BEHAVIOR; MODULUS
abstract K1-xNaxNbO3 (where x = 0.48, 0.53, 0.56 and 0.60) (KNN) perovskite structured ferroelectric ceramics were prepared by the solid-state reactionmethod. X-ray diffraction patterns indicate that single orthorhombic phase was formed for KNN. Dielectric anomalies around 200 degrees C and 370 degrees C were identified as ferroelectric-ferroelectric and ferroelectric-paraelectric transition temperatures for KNN compound. The electrical behavior of KNN ceramics was studied by the help of impedance spectroscopy technique in the different temperature range. The impedance response in KNN ceramics could be resolved into a single contribution, associated with the bulk/grain. The conductivity studies confirm that the activation energies are strongly frequency dependent. A decreasing trend of Z' with rise in temperature suggests the presence of negative temperature coefficient of resistance (NTCR) in the material in the low frequency region but tends to merge in the high frequency region at almost all temperatures.
publisher TAYLOR & FRANCIS LTD
issn 1058-4587
year published 2016
volume 168
issue 1
beginning page 115
ending page 129
digital object identifier (doi) 10.1080/10584587.2016.1159536
web of science category Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter
subject category Engineering; Physics
unique article identifier WOS:000375005200012
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journal analysis (jcr 2017):
journal impact factor 0.367
5 year journal impact factor 0.369
category normalized journal impact factor percentile 2.920
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