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Abstract
AbstractPNb9O25 ceramic was prepared using a sparking plasma sintering (SPS) method. Microstructure, dielectric and electrical properties of the ceramic were investigated. Dense ceramic was obtained, and the ceramic exhibited a high dielectric constant (>1000) and a low dielectric loss (∼2%) in the investigated frequency range of 100 Hz‐100 kHz at room temperature. Dielectric relaxations with strong frequency dispersion occurred at temperatures higher than 250°C, which were due to oxygen vacancies. A highly stable capacitance (< 10% deviation) over a wide temperature range of –30°C to –200°C was obtained. The ceramic also showed a relatively high electrical conductivity (>4 × 10−8 S/cm) with an activation energy of approximately 0.9 eV in the temperature range of >200°C.
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