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IJPAP Vol.45(07) [July 2007] >


Title: Temperature dependence of dielectric properties of sodium potassium niobate ceramics
Authors: Bhatt, S C
Singh, K
Uniyal, M
Prakash, Om
Singh, Pankaj K
Saxena, R
Semwal, B S
Keywords: Ceramics
Dielectric constant
loss tangent
Electrical conductivity
Issue Date: Jul-2007
Publisher: CSIR
IPC CodeG01R 27/26
Abstract: Dielectric constant, loss tangent and electrical conductivity of Na₀․₅K₀․₅NbO₃ (SPN) ceramic pellets have been measured at 10, 100 and 1000 kHz frequencies and at temperature varying from room temperature to 250ºC. The dielectric constant increases with increase of temperature up to 190ºC at all the three frequencies, and thereafter, it decreases with further increase of temperature, i.e., it shows a structural transition at about 190ºC. The loss tangent also shows similar behaviour as dielectric constant shows. Some variations may be due to relaxation effects and impurities etc. around the sensitive transition region, which are seem to play prominent role in this soft mode region. Electrical conductivity increases with increase in temperature at all the three frequencies.
Page(s): 609-612
ISSN: 0019-5596
Source:IJPAP Vol.45(07) [July 2007]

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