The flexoelectric effect associated size dependent pyroelectricity in solid dielectrics

被引：15

作者：

Bai, Gang ^{[1
,2
,3
]}

Liu, Zhiguo ^{[3
]}

Xie, Qiyun ^{[1
,2
]}

Guo, Yanyan ^{[1
,2
]}

Li, Wei ^{[1
,2
]}

Yan, Xiaobing ^{[4
]}

机构：

[1] Nanjing Univ Posts & Telecommun, Jiangsu Prov Engn Lab RF Integrat & Micropackagin, Nanjing 210023, Jiangsu, Peoples R China

[2] Nanjing Univ Posts & Telecommun, Coll Elect Sci & Engn, Nanjing 210023, Jiangsu, Peoples R China

[3] Nanjing Univ, Solid State Microstruct Lab, Nanjing 210093, Jiangsu, Peoples R China

[4] Hebei Univ, Coll Elect & Informat Engn, Baoding 071002, Peoples R China

来源：

AIP ADVANCES | 2015年 / 5卷 / 09期

基金：

中国国家自然科学基金;

关键词：

TITANATE;

D O I：

10.1063/1.4930595

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A phenomenological thermodynamic theory is used to investigate the effect of strain gradient on the pyroelectric effect in centrosymmetric dielectric solids. Direct pyroelectricity can exist as external mechanical stress is applied to non-pyroelectric dielectrics with shapes such as truncated pyramids, due to elastic strain gradient induced flexoelectric polarization. Effective pyroelectric coefficient was analyzed in truncated pyramids. It is found to be controlled by size, ambient temperature, stress, and aspect ratio and depends mainly on temperature sensitivity of flexoelectric coefficient (TSFC) and strain gradient of the truncated pyramids dielectric solids. These results show that the pyroelectric property of Ba0.67Sr0.33TiO3 above T-c similar to PZT and other lead-based ferroelectrics can be obtained. This feature might widely broaden the selection of materials for infrared detectors with preferable properties. (C) 2015 Author(s).

引用

页数：7

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