Origin of the Anomalous Piezoelectric Response in Wurtzite ScxAl1-xN Alloys
2010 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 104, no 13, 137601- p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
American Physical Society , 2010. Vol. 104, no 13, 137601- p.
ScAlN, ScN, AlN, nitrides, first-principles, piezoelectricity, phase competition, elastic constants, piezoelectric constants
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:liu:diva-54850DOI: 10.1103/PhysRevLett.104.137601ISI: 000276260800048OAI: oai:DiVA.org:liu-54850DiVA: diva2:310866
Ferenc Tasnadi, Björn Alling, Carina Höglund, Gunilla Wingqvist, Jens Birch, Lars Hultman and Igor Abrikosov, Origin of the Anomalous Piezoelectric Response in Wurtzite ScxAl1-xN Alloys, 2010, PHYSICAL REVIEW LETTERS, (104), 13, 137601.
Copyright: American Physical Society