按照Swarts和Shrout提出的方法制得了单相的钙钛矿结构Pb（Mg1／3Nb2／3）O3陶瓷样品，这种弛豫型铁电体陶瓷显示了不同于正常铁电体的P～E回线随频率变化特性．
According to the method proposed by Swarts and Shrout, PMN ceramic material with single perovskite phase was prepared, and no any
pyrochloride one was detected by X-ray diffraction analyses. SEM observation shows that the sample was dense without the apparent
pores. The hysteresis (P～E) loop was measured by using a Radiant Technology RT 66a and an amplifier. The change of P～E loop of the
sample with the frequency measured shows that the dependence of the polarization on the field of PMN relaxor ferroelectric ceramic material
at low frequency (e.g.10 Hz) is a curve without any hysteresis at room temperature, and P～E loop appears with the increase of frequency
measured(e.g.>100 Hz), the higher the frequency, the larger the P～E loop, which differs from that of normal ferroelectrics.
参考文献
| [1] | Cross L E. Ferroelectrics, 1994, 151: 305--320 2 Pan W Y, et al. Japan. J. A. P., 1989, 28 (4): 653--661 3 Shrout T R, Fielding J. Proc. 1990 IEEE Ultrasonic Symposium, U.S.A. Dec. 4--7, 711--720 4 Swartz S L, Shrout T R. Mater. Res. Bull., 1982, 17: 1245--1250 |
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