|
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
|
