Superior dielectric and varistor properties of ZnO or SnO<sub>2</sub> diffused calcium copper titanate ceramics
نویسندگان
چکیده
Sub-micrometer-sized (0.33 μm) polycrystalline powders of calcium copper titanate (CCTO) were synthesized via the solgel method. Compacted calcined sintered at 900 °C/2h to obtain porous (<80% density) pellets. Subsequently, ZnO or SnO 2 pastes (∼10 μm grain size) smeared on either side pellets and 1100 °C/15 h, which yielded dense (>95% ceramics. X-ray structural investigations revealed presence traces in bulk CCTO Scanning electron microscopy energy dispersive spectroscopic studies confirmed diffusion segregation these oxides boundaries. The dielectric varistor properties diffused samples found be superior that pristine For instance, constant (ɛ′) ceramics exhibited a value as high 2.4 × 10 4 (1 kHz, room temperature) loss (D) 0.059. Similarly, 2.7 associated with 0.047. figure merit performance, i.e., nonlinear coefficient ( α = 10.6), sample is significantly higher than 7.4) 4.5) data obtained for both rationalized by invoking Cole–Cole analysis. thermal activation was estimated from temperature-dependent besides current (I)–voltage (V) characteristics. Equivalent circuit modeling Nyquist plots demonstrated inclusion layers remarkably improved boundary resistance R gb ) 5-fold 20-fold, respectively, resulted making better dielectric. This methodology fabricating interfacial engineering could pave way obtaining exotic functional properties.
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ژورنال
عنوان ژورنال: Journal of Applied Physics
سال: 2023
ISSN: ['1089-7550', '0021-8979', '1520-8850']
DOI: https://doi.org/10.1063/5.0139359