Nanoscale electromechanical properties of CaCu3Ti4O12 ceramics

被引：39

作者：

Tararam, R. ^{[3
]}

Bdikin, I. K. ^{[4
,5
]}

Panwar, N. ^{[1
,2
]}

Varela, J. A. ^{[3
]}

Bueno, P. R. ^{[3
]}

Kholkin, A. L. ^{[1
,2
]}

机构：

[1] Univ Aveiro, Dept Ceram & Glass Engn, P-3810193 Aveiro, Portugal

[2] Univ Aveiro, CICECO, P-3810193 Aveiro, Portugal

[3] UNESP, Inst Quim, Dept Fis Quim, BR-14800900 Araraquara, Brazil

[4] Univ Aveiro, Dept Mech Engn, P-3810193 Aveiro, Portugal

[5] Univ Aveiro, TEMA, P-3810193 Aveiro, Portugal

来源：

JOURNAL OF APPLIED PHYSICS | 2011年 / 110卷 / 05期

关键词：

HIGH-DIELECTRIC-CONSTANT; FLEXOELECTRIC POLARIZATION; HYSTERESIS; TITANATE;

D O I：

10.1063/1.3623767

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Piezoresponse Force Microscopy (PFM) is used to characterize the nanoscale electromechanical properties of centrosymmetric CaCu3Ti4O12 ceramics with giant dielectric constant. Clear PFM contrast both in vertical (out-of-plane) and lateral (in-plane) modes is observed on the ceramic surface with varying magnitude and polarization direction depending on the grain crystalline orientation. Lateral signal changes its sign upon 180 degrees rotation of the sample thus ruling out spurious electrostatic contribution and confirming piezoelectric nature of the effect. Piezoresponse could be locally reversed by suitable electrical bias (local poling) and induced polarization was quite stable showing long-time relaxation (similar to 3 hrs). The electromechanical contrast in unpoled ceramics is attributed to the surface flexoelectric effect (strain gradient induced polarization) while piezoresponse hysteresis and ferroelectric-like behavior are discussed in terms of structural instabilities due to Ti off-center displacements and structural defects in this material. (C) 2011 American Institute of Physics. [doi:10.1063/1.3623767]

引用

页数：5

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