성분에 따른 Pb(ZrxTi1-x)O3 세라믹스의 Dynamic 초전 특성과 그 주파수 의존성

초록

Pyroelectric properties of rhombohedral Pb(ZrxTi1-x)O3 ceramics with various Zr/Ti ratios of 84/16, 87/13, 90/10, and 93/7 are investigated using dynamic method. The response characteristics of PZT samples are examined by considering frequency dispersion. Since the reorientation of the grain does not the influence on the increase of frequency at low frequency (2∼200Hz), the maximum pyroelectric response can be obtained with the change of spontaneous polarization. However, the pyroelectric response of PZT samples could be reduced as the spontaneous polarization decreases due to the restrain of the reorientation of the grain with the increasing of frequency at high frequency (200∼2000Hz). We have obtained the good pyroelectric response in the PZT sample having 84/16 Zr/Ti ratio, then the pyroelectric coefficient (γ) and the figure of merit (FV) were 17.3 nC/cm2K and 2.28×10-11 Ccm/J, respectively. The noise equivalent power (NEP), the detectivity (D*) were 1.21×10-7 W/Hz1/2 and 8.26×106 cmHz1/2/W, respectively.