钛酸锶的超低频介电谱

Ultra-Low Frequency Dielectric Spectroscopy of SrTiO_3

研制了由计算机自动控制的超低频介电谱测量装置 ,其频率下限原则上没有限制 .将该装置与HP4192A阻抗分析仪相结合 ,在 10 -4 Hz至 10 5Hz范围内测量了钛酸锶陶瓷的介电谱 .其Cole -Cole图表明 ,得自于音频至微波段介电谱的Cole -Cole非德拜型弛豫规律 ,仍适用于超低频段 .此时 。

A computer controlled ultra-low frequency dielectric spectrometer has been developed, whose low frequency is unlimited. By using this spectrometer and HP4192A impendence analyzer, we have measured the dielectric spectrum of SrTiO 3 in frequencies from 10 -4 ～10 5Hz. It's Cole-Cole plot shows that the Cole-Cole non-Debye dielectric relaxation law concluded from the results in sound to microwave frequencies is still valid in ultra-low frequencies. Here the most important contribution to dielectric spectrum is the space charge caused by defects in a given sample.