研究了不同温度MgNb2O6的原始合成反应，结果显示游离MgO的含量随MgNb2O6合成温度的升高而减少．首先合成MgNb2O6，但合成时并不加入过量MgO，合成温度为1050℃，由此制备了一种PMN基电致伸缩陶瓷．在X射线衍射检测极限内，并未发现此PMN基电致伸缩陶瓷存在焦绿石第二相．对该陶瓷施加1kV／mm频率为0．07Hz的准静态电场，在室温下其纵向电致应变（S11）达1．05×10－3而滞后仅为6．8％．还研究了MgNb2O6的合成温度与PMN基陶瓷电致伸缩性能的关系，它表明PMN基陶瓷的居里温度Tc随MgNb2O6的合成温度的提高而增高，从而引起介电常数的下降和滞后增大．
The studies of initial calcining reactions of MgNb2O6were carried out at different calcining temperatures.
The results show that the amount of free MgO exhibits a decreasing with the increase of MgNb2O6 calcining temperature. PMN based electrostrictive
ceramics were prepared according to the process described by Swartz et al, but MgNb2O6 was formed without addition of excess MgO at 1050℃.
No pyrochlor phase, within the detection limits of X-ray diffractometer was observed in the PMN based ceramics. At room temperature the
longitudinal electrostrictive strain (S11) for the ceramics was found to be 1.05×10-3 with only 6.8% hysteresis applied a quasi-static electric
field 1kV/mm operating frequencies of 0.07Hz.
The relation between calcining temperature of MgNb2O6 and electrostrictive properties of the PMN based ceramics was also studied. It
was obvious that Curie temperature Tc of the PMN based ceramics increases with the increase of calcining temperature of MgNb2O6 and causes
the ceramics having lower dielectric constant and larger electric machanical hysteresis.
参考文献
| [1] | Mchenry D A, Giniewicz J, Jang S J, et al. Ferroelectrics, 1989, 93: 351--359. [2] Chen J, Harmer M P. J. Am. Ceram. Soc., 1990, 73 (1): 68--79. [3] Inada M. Natl. Tech. Rep., 1997, 27 (1): 95--102. [4] Swartz S L, Shrout T R. Mater. Res. Bull., 1982, 17: 1245--1250. [5] Pilgrim S M, Massuda M, Prodey J D, et al. J. Am. Soc., 1992, 75 (7): 1964--1960. [6] Goo E H. Am. Ceram. Soc., 1986, 69 (8): C-188--C-190. [7] Wen B S, Sheng W J, Ma J H. Ferroelectrics, 1997, 195: 145--148. |
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