Doped Nanocrystalline ZnO Powders for Non-Linear Resistor Applications by Spray Pyrolysis Method
Abstract:Homogeneous and doped nanocrystalline ZnO powders (30–200 nm) were synthesized by spray pyrolysis technique. The spray pyrolysed powders were calcined in the temperature range of 500–750 °C. Formation of insulating pyrochlore phase started from 700 °C during the calcination itself. The calcined powders were compacted and sintered at different temperatures ranging from 900–1200 °C for 0.5–4 h. The densification behavior was found to be dependent on calcination temperature of the nanopowder. The resulting discs were found to have density (5.34–5.62 g/cc) in the range of 96–99% of theoretical density. The breakdown voltage value obtained for the nanopowder based non-linear resistor is 10.3 kV/cm with low leakage current density of 0.7 A/cm2 and coefficient of nonlinearity as high as 193. The activation energy for grain growth of the doped ZnO nanopowder powders is 449.4± 15 kJ/mol.
Document Type: Research Article
Publication date: 2009-07-01
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