This paper reports on synthesis of polycrystalline complex perovskite CaCu_(3)Ti_(4)O_(12)(as CCTO)ceramic powders prepared by a sol–gel auto combustion method at different sintering temperatures and sintering times,...This paper reports on synthesis of polycrystalline complex perovskite CaCu_(3)Ti_(4)O_(12)(as CCTO)ceramic powders prepared by a sol–gel auto combustion method at different sintering temperatures and sintering times,respectively.The effect of sintering time on the structure,morphology,dielectric and electrical properties of CCTO ceramics is investigated.Tuning the electrical properties via different sintering times is demonstrated for ceramic samples.X-ray diffraction(XRD)studies confirm perovskite-like structure at room temperature.Abnormal grain growth is observed for ceramic samples.Giant dielectric permittivity was realized for CCTO ceramics.High dielectric permittivity was attributed to the internal barrier layer capacitance(IBLC)model associated with the Maxwell–Wagner(MW)polarization mechanism.展开更多
基金supported by the National Science Foundation under grant NSF-EFRI RESTOR#1038272.
文摘This paper reports on synthesis of polycrystalline complex perovskite CaCu_(3)Ti_(4)O_(12)(as CCTO)ceramic powders prepared by a sol–gel auto combustion method at different sintering temperatures and sintering times,respectively.The effect of sintering time on the structure,morphology,dielectric and electrical properties of CCTO ceramics is investigated.Tuning the electrical properties via different sintering times is demonstrated for ceramic samples.X-ray diffraction(XRD)studies confirm perovskite-like structure at room temperature.Abnormal grain growth is observed for ceramic samples.Giant dielectric permittivity was realized for CCTO ceramics.High dielectric permittivity was attributed to the internal barrier layer capacitance(IBLC)model associated with the Maxwell–Wagner(MW)polarization mechanism.
