Abstract
Abstract Low temperature sintering and microwave dielectric properties of barium polytitanate (BaO–4TiO 2 ) ceramics prepared by means of polymeric precursor route based on the Pechini process were investigated. Pure and fine BaTi 4 O 9 powders with particle sizes of 100–200 nm were derived by thermal decomposition of amorphous gel precursor (above 750 °C). They formed single orthorhombic BaTi 4 O 9 phase and showed fine and well-dispersed by XRD and SEM observation. The high sintering ability of the prepared powders enabled the fabrication of dielectric ceramics at low sintering temperatures (1200–1300 °C). The well-sintered BaTi 4 O 9 ceramics with high relative densities (95%) were found to show excellent microwave dielectric properties compared to those prepared by conventional method at the same sintering temperature.
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