Dielectric behavior of paraelectric KTaO3, CaTiO3, and (Ln1/2Na1/2) TiO3 under a dc electric field -: art. no. 184104

被引：83
作者：
Ang, C [1 ]
Bhalla, AS [1 ]
Cross, LE [1 ]
机构：
[1] Penn State Univ, Mat Res Lab, University Pk, PA 16802 USA
来源：
PHYSICAL REVIEW B | 2001年 / 64卷 / 18期
关键词：
D O I：
10.1103/PhysRevB.64.184104
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The dc electric-field dependence of dielectric constant in the paraelectrics, KTaO3 single crystals, CaTiO3 and (Ln(1/2)Na(1/2))TiO3 (Ln = La and Nd) ceramics is studied at cryogenic temperatures in the dc electric-field range 0-60 kV/cm. The results indicate that KTaO3 possesses a high tunability K{=[epsilon (E-0)-epsilon (E)]/epsilon (E-0) = similar to 50%} at 20 kV/cm, and low dielectric loss tan delta (similar to0.003); while CaTiO3 and (Ln(1/2)Na(1/2))TiO3 (Ln = La and Nd) show low tunability of similar to1% and similar to0.1%, respectively, at 20 kV/cm; however, the dielectric loss tan delta is very small (similar to0.0004-0.003). The possible physical mechanism of the behavior observed is discussed.
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页数：6
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