Doped Nanocrystalline ZnO Powders for Non-Linear Resistor Applications by Spray Pyrolysis Method
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.
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Document Type: Research Article
Publication date: 2009-07-01
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