Dielectric Response and Transport Properties of Pb₂Sr₂CaCu₂O₉ [Lead Strontium Calcium Copper Oxide]

摘要

High dielectric permittivity, good mechanical properties and excellent thermal stability are highly desired qualities for the dielectric materials used in embedded capacitors and energy-storage devices. This study reports the temperature dependence and very low loss factor of Pb_(2)Sr_(2)CaCu_(2)O_(9) ceramics. X-ray diffraction (XRD) and scanning electron microscope (SEM) are used to analyze the sample. The dielectric properties of the material prepared has been investigated in the frequency range 42–1 MHz and in the temperature range 303–873 K. The result reveals that Pb_(2)Sr_(2)CaCu_(2)O_(9) have high dielectric constant with significant temperature and frequency dependence which makes them appropriate in the application of miniaturization of electronic devices. The dielectric constant and the loss factor decreases with increase in frequency of the applied field. Impedance studies confirm that dielectric relaxation in the material is of non-Debye type. Conductivity studies proves quality information related to the charge transport properties. The frequency analysis of modulus properties pictures a distribution of the relaxation time existing in the system. The new ceramic material Pb_(2)Sr_(2)CaCu_(2)O_(9) will be a promising candidate for uses in embedded capacitors, especially in high-temperature circumstance.