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Diffuse phase transition and electrical properties of lead-free piezoelectric (LixNa1-x)NbO3 (0.04 <= x <= 0.20) ceramics near morphotropic phase boundary

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Title Diffuse phase transition and electrical properties of lead-free piezoelectric (LixNa1-x)NbO3 (0.04
 
Creator MITRA, S
KULKARNI, AR
PRAKASH, O
 
Subject LITHIUM-NIOBATE CERAMICS
RAMAN-SCATTERING
IMPEDANCE SPECTROSCOPY
NA1-XLIXNBO3 CERAMICS
SINGLE-CRYSTALS
SOLID-SOLUTIONS
TEMPERATURE
POWDERS
 
Description Temperature-dependent dielectric permittivity of lead-free (LixNa1-x)NbO3 for nominal x = 0.04-0.20, prepared by solid state reaction followed by sintering, was studied to resolve often debated issue pertaining to exactness of morphotropic phase boundary (MPB) location besides structural aspects and phase stability in the system near MPB. Interestingly, a diffuse phase transition has been observed in the dielectric permittivity peak arising from the disorder induced in A-site and structural frustration in the perovskite cell due to Li substitution. A partial phase diagram has been proposed based on temperature-dependent dielectric permittivity studies. The room temperature piezoelectric and ferroelectric properties were investigated and the ceramics with x = 0.12 showed relatively good electrical properties (d(33) = 28 pC/N, k(p) = 13.8%, Q(m) = 440, P-r = 12.5 mu C/cm(2), E-c = 43.2 kV/cm, and T-m = 340 degrees C). These parameter values make this material suitable for piezoelectric resonator and filter applications. Moreover, a high dielectric permittivity (epsilon'(r) = 2703) with broad diffuse peak near transition temperature, and low dielectric loss (
 
Publisher AMER INST PHYSICS
 
Date 2014-10-15T15:33:56Z
2014-10-15T15:33:56Z
2013
 
Type Article
 
Identifier JOURNAL OF APPLIED PHYSICS, 114(6)
http://dx.doi.org/10.1063/1.4817815
http://dspace.library.iitb.ac.in/jspui/handle/100/15164
 
Language en