钨青铜型Ca<sub>0.28</sub>Ba<sub>0.72</sub>Nb<sub>2</sub>O<sub>6</sub>单晶的正常弛豫铁电相转变研究
研究了大块Ca0.28Ba0.72Nb2O6(CBN-28)单晶沿[001]方向的铁电介电性能.结果表明,CBN-28单晶的自发极化、剩余极化和矫顽场分别为35.3μC/cm2,32.2μC/cm2和38.1kV/cm.在室温下频率f=10kHz时,介电常数(εr=195,介电损耗tgδ=0.32.变温的介电谱显示该单晶在252℃附近发生了正常铁电体向弛豫铁电体的转变.低频时在325℃～500℃范围内出现了具有弛豫特征的介电反常.120℃附近有一由氧空位的迁移引起的介电弛豫损耗峰,由此计算得激活能为1.19eV.通过阻抗谱计算,在500℃～560℃范围内的电导激活能为1.33eV.
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| Autori principali: | , , , , , |
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| Natura: | Artigo |
| Lingua: | Inglês |
| Pubblicazione: |
Editorial Department of Journal of Sichuan University (Natural Science Edition)
2005-01-01
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| Serie: | 四川大学学报. 自然科学版 |
| Soggetti: | |
| Accesso online: | http://science.scu.edu.cn/thesisDetails?columnId=156447196&Fpath=home&index=0 |
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