Enhancement of the dielectric permittivity of Ta2O5 ceramics by CO2 laser irradiation

Lingfei Ji; Yijian Jiang; Wei Wang; Zhenlong Yu
August 2004
Applied Physics Letters;8/30/2004, Vol. 85 Issue 9, p1577
Academic Journal
The tantalum-pentoxide ceramics with significantly enhanced dielectric permittivities around 60–70 (up to 71.62) at 1 MHz and 20°C were prepared by CO2 laser irradiation. The dielectric loss and the temperature coefficient of dielectric permittivity could be 0.0128 and 721 ppm/°C, respectively. Dielectric properties were investigated over the temperature range from -60 to 100°C at 1 MHz. The frequency dependence of the dielectric properties was also investigated between 1 kHz and 1 MHz at 20 °C. The stabilization of high-temperature phase at RT and crystallographic orientation in the ceramics by laser irradiation can explain the strong enhancement of the dielectric permittivity.


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