Abstract

GIRALDO-GIRALDO, Olga M.; PEREZ-WALTON, Santiago  and  OSORIO-GUILLEN, Jorge M.. A first-principles study of the piezoelectric properties of Niobium and Tantalum Pentoxides. TecnoL. [online]. 2017, vol.20, n.40, pp.43-51. ISSN 0123-7799.

Abstract Nb2O5 and Ta2O5 are wide-bandgap semiconductor oxides that have attracted great interest in recent years due to their technological applications, such as in electronics, telecommunications or photocatalysis. Because of this, we present a study based on first-principles calculations of the piezoelectric properties of the Z and β phases of Ta2O5 as well as the Z and P phases of Nb2O5 by using the Density Functional Theory and the Generalized Gradient Approximation with PBEsol parameterization. Once the equilibrium geometry was determined for each of these phases, we made a calculation using the linear response theory to determine the piezoelectric tensor associated with each phase. We discovered that the Z phase of both compounds presents good piezoelectric response. Additionally, β-Ta2O5 does not show such response.

Keywords : Piezoelectricity; wide-bandgap semiconductors; Nb2O5; Ta2O5; first-principles.

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