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Abstract
Dielectric properties of nanocrystalline barium zirconate titanate (Ba(ZrxTi1-x)O3; BZT for x = 0.1 and 0.3) synthesized by glycine-nitrate autocombustion method were investigated in this study. The phase formation examined by TGA-DTA, XRD, FT-IR and Raman spectroscopy confirmed that high purity single-phase BZT with perovskite structure was obtained by using glycine-to-nitrate molar ratio of 2.2:4 and calcining in air at 1100 °C for 4 h. TEM analysis showed that BZT had agglomerate particles consisted of primary spherical nanocrystals with the size of 8-11 nm. The diffuse phase transition behavior of BZT ceramics increased with increasing Zr concentration and for x = 0.3, the Curie temperature; Tc, shifted to below room temperature. The BZT ceramics for x = 0.1 had relatively high dielectric constant (ε), 13007, low Tc, 76 °C and comparable dielectric loss (tan δ) at Tc, 0.012 which caused by the high degree of Zr diffuseness into the perovskite structure. These results suggest that glycine-nitrate autocombustion is the effective method for preparing high quality BZT ceramics.
Acknowledgements
The authors would like to thank K. Jamnongtham, M. Muangkaew, S. Sirikraiwatanawong, S. Chupan, S. Lalitathiti and S. Kitprasert for laboratory assistance.