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2008 | 6 | 4 | 849-852
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Structural and dielectric studies of lead-free ceramics: Na1/2Y1/2TiO3

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The polycrystalline samples of Na1/2Y1/2TiO3 were prepared by the mixed-oxide method. A preliminary X-ray structural analysis was shown to exhibit the formation of a single-phase compound with an orthorhombic structure. Microstructural analysis by scanning electron microscopy (SEM) exhibits well defined grains distributed uniformly through out the sample suggesting the compactness and homogeneity of the sample. Detailed studies of dielectric properties of Na1/2Y1/2TiO3 in a wide frequency range (102–106 Hz) at different temperatures (31–500°C) show a dielectric anomaly at 105°C, which may be related to a ferroelectricparaelectric phase transition as suggested by hysteresis loop at room temperature. An ac conductivity (σ
ac) of the material is mainly governed by the polaron hopping mechanism, which is also influenced by both frequency and temperature. The activation energy was obtained from the plot of temperature with a.c. conductivity.
  • Department of Physics, Indian Institute of Technology, Kharagpur, 721 302, India
  • Department of Physics, Indian Institute of Technology, Kharagpur, 721 302, India
  • Department of Physics and Technophysics, Vidyasagar University, Midnapore, 721 102, India
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