Abstract
In this study, the effect of the polyvinyl alcohol (PVA) binder solvent composition on the electrical properties of sintered 0.98BaTiO3-0.02(Ba0.5Ca0.5)SiO3 ceramics doped with x wt.% Dy2O3 (0.0 ≤ x ≤ 0.3) was investigated. In the absence of the PVA binder, the specimens sintered at 1260 and 1320 °C for 1 h in a reducing atmosphere showed a single BaTiO3 phase with the perovskite structure. The relative densities of the specimens were higher than 90%, and the grain morphologies were uniform for all the solvent compositions. At 1 kHz, the dielectric constant of the specimens depended not only on their crystal structural characteristics, but also on their microstructural characteristics. The microstructural characteristics of the specimens with the PVA binder were affected by the ethyl alcohol:water ratio of the 10 wt.% PVA-111 solution. A homogeneous microstructure was observed for the 0.1 wt.% Dy2O3-doped specimens sintered at 1320 °C for 1 h when the ethyl alcohol/water ratio of the binder solution was 40/60. These specimens showed the maximum dielectric constant (εr = 2723.3) and an insulation resistance of 270 GΩ. The relationships between the microstructural characteristics and dissipation factor (tanδ) of the specimens were also investigated.
Highlights
The rapid progress in the development of novel electronic devices has increased the demand for miniaturisation and the development of high-efficiency and highly functional electronic components
A single phase of BaTiO3 with the perovskite structure was observed for the ceramics sintered at 1320 ◦C for 1 h, irrespective of Dy2O3 content
When no binder solution was used, the specimens sintered at 1320 ◦C for 1 h in a reducing atmosphere (95% N2, 5% H2) showed a BaTiO3 single phase with the perovskite structure, irrespective of the Dy2O3 content (x wt.%) (0.0 ≤ x ≤ 0.3)
Summary
The rapid progress in the development of novel electronic devices has increased the demand for miniaturisation and the development of high-efficiency and highly functional electronic components. With the electrification of automobiles, the research to improve the performance of passive components, such as capacitors, inductors, and resistors, has skyrocketed. BaTiO3 ceramics show several crystal structural phases depending on the displacement of ions constituting the unit lattice of the crystal structure. The most important structural characteristic of BaTiO3 ceramics for capacitor applications is the tetragonality (c/a) of their lattice parameters. To improve the dielectric properties of BaTiO3 ceramics, various dopant additives that can increase the dielectric constant (K) of these ceramics are investigated. This is because such dopants can increase the tetragonality and octahedral volume of the unit cell [5,6]
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