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Published in:
14-12-2016
Effects of Ti/Nb stoichiometry on the microstructure and dielectric responses of NaCu3Ti3−xNb1+xO12 ceramics
Published in: Journal of Materials Science: Materials in Electronics | Issue 7/2017
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Abstract
Different stoichiometry of Ti/Nb in NaCu3Ti3−xNb1+xO12 ceramics were prepared by solid state synthesis. Microstructure and dielectric properties of NaCu3Ti3−xNb1+xO12 ceramics were investigated. The mean grain size decreases with increasing Nb content. Dielectric constant (ε′) and dielectric loss (tanδ) are changed dramatically with different stoichiometry of Ti/Nb. Two relaxation processes were identified for all the samples, one at low frequency region (<1 kHz) and the other one at 0.1 MHz region. Peaks of tanδ depressed and shifted to higher frequency as Nb content increased. Impedance spectroscopy analysis reveals that NaCu3Ti3−xNb1+xO12 ceramics are electrically heterogeneous, consisting of semiconducting grains and insulating grain boundaries.