| Pb(Fe_(1/2)Nb_(1/2))O_3弛豫型铁电陶瓷的介电弛豫特性 |
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| 引用本文： | 陈大任,浦光华.Pb(Fe_(1/2)Nb_(1/2))O_3弛豫型铁电陶瓷的介电弛豫特性[J].材料研究学报,1992,6(4):326-331. |
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| 作者姓名： | 陈大任 浦光华 |
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| 作者单位： | 中国科学院上海硅酸盐研究所
(陈大任)，中国科学院上海硅酸盐研究所(浦光华) |
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| 基金项目： | 国家自然科学基金,B587023 |
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| 摘 要： | 采用氧化物一次合成法制得了纯钙钛矿相的 Pb(Fe_(1/2)Nb_(1/2))O_3陶瓷。经介电和热激发电流的测量,发现热激发电流峰温度和介电峰温度不一致。用过渡相区模型作了较好的解释。认为它仍为典型的弛豫型铁电体。本文对其介电弛豫不明显,即△T(0.1—100kHz)=0℃的原因以及 Nb~(5+),Fe~(3+)离子在氧八面体中所处的状态作了讨论。
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| 关 键 词： | 弛豫型铁电体 介电弥散 铁电微畴 有序 无序 |
| 收稿时间： | 1992-08-25 |
| 修稿时间： | 1992-08-25 |
STUDY ON DIELECTRIC RELAXATION PROPERTIES FOR Pb(Fe_(1/2)Nb_(1/2))O_3 FERROELECTRIC CERAMIC |
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| CHEN Daren,PU Guanghua.STUDY ON DIELECTRIC RELAXATION PROPERTIES FOR Pb(Fe_(1/2)Nb_(1/2))O_3 FERROELECTRIC CERAMIC[J].Chinese Journal of Materials Research,1992,6(4):326-331. |
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| Authors: | CHEN Daren PU Guanghua |
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| Affiliation: | CHEN Daren,PU Guanghua(Shanghai Institute of Ceramics,Academia Sinica) |
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| Abstract: | A Pb(Fe_(1/2)Nb_(1/2))O_3 ferroelectric ceramic with single perovskite phase was pre-pared using mixing and calcining the constituent oxides.The temperature dependences ofdielectric constant and thermally stimulated current were measured.The results indicate that thetemperature of maximum thermally stimulated current is lower than that of maximum dielectricconstant,and it was interpreted with the view of transitional phase region.It was concluded thatPFN is a typical ferroelectric relaxor.The reason of weak dielectric dispersion and the status ofNb~(5+),Fe~(3+)in octahedral were discussed. |
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| Keywords: | ferroelectric relaxor dielectric dispersion ferroelectric microdomain order disorder |
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