Axial deformation of boron nitride nanotubes (BNNTs) induced by an external electric field is studied by density functional theory. It is found that the field-induced deformation can reach 1% at a field strength of around 10 V nm(-1) due to both the converse piezoelectric effect and the electrostrictive effect. This deformation is about nine times larger than that of traditional piezoceramics and can be enhanced with increasing length or decreasing diameter of the BNNTs. The corresponding volumetric work capacity is calculated to be two orders of magnitude higher than those of traditional piezoceramics.
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机译：利用密度泛函理论研究了外部电场引起的氮化硼纳米管（BNNTs）的轴向变形。发现由于逆压电效应和电致伸缩效应，在大约10 V nm（-1）的场强下，场致变形可以达到1％。这种变形大约是传统压电陶瓷变形的九倍，并且可以随着BNNT长度的增加或直径的减小而增强。计算出的相应的容积工作能力比传统的压电陶瓷高两个数量级。
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