铌酸镁的合成与铌镁酸铅基电致伸缩陶瓷性能关系研究

无机材料学报

铌酸镁的合成与铌镁酸铅基电致伸缩陶瓷性能关系研究

温保松; 严鸿萍; 马佳华

中国科学院上海硅酸盐研究所; 上海 200050

收稿日期:1998-12-09 修回日期:1999-01-22 出版日期:1999-12-20 网络出版日期:1999-12-20

Relationship between Calcining Reactions of MgNb₂O₆ to the Properties of PMN-Based Electrostrictive Ceramics

WEN Bao-Song; YAN Hong-Ping; MA Jia-Hua

Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China

Received:1998-12-09 Revised:1999-01-22 Published:1999-12-20 Online:1999-12-20

摘要/Abstract

摘要： 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．

关键词: 铌酸镁, 合成温度, 过量氧化镁, 焦绿石相, 电致伸缩

Abstract: 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 T_c 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.

Key words: magnesium niobate, calcining temperature, exess magresium, pyrochlor phase, electrostriction

中图分类号:

TN304

温保松,严鸿萍,马佳华. 铌酸镁的合成与铌镁酸铅基电致伸缩陶瓷性能关系研究[J]. 无机材料学报.

WEN Bao-Song,YAN Hong-Ping,MA Jia-Hua. Relationship between Calcining Reactions of MgNb₂O₆ to the Properties of PMN-Based Electrostrictive Ceramics[J]. Journal of Inorganic Materials.

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