Origin of the Anomalous Piezoelectric Response in Wurtzite ScxAl1-xN Alloys

被引：358

作者：

Tasnadi, Ferenc ^{[1
]}

Alling, Bjoern ^{[1
]}

Hoeglund, Carina ^{[1
]}

Wingqvist, Gunilla ^{[1
]}

Birch, Jens ^{[1
]}

Hultman, Lars ^{[1
]}

Abrikosov, Igor A. ^{[1
]}

机构：

[1] Linkoping Univ, Dept Phys Chem & Biol, SE-58183 Linkoping, Sweden

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 13期

关键词：

POLARIZATION;

D O I：

10.1103/PhysRevLett.104.137601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The origin of the anomalous, 400% increase of the piezoelectric coefficient in ScxAl1-xN alloys is revealed. Quantum mechanical calculations show that the effect is intrinsic. It comes from a strong change in the response of the internal atomic coordinates to strain and pronounced softening of C-33 elastic constant. The underlying mechanism is the flattening of the energy landscape due to a competition between the parent wurtzite and the so far experimentally unknown hexagonal phases of the alloy. Our observation provides a route for the design of materials with high piezoelectric response.

引用

页数：4

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