Vibrational properties of Cu3XY4 sulvanites (X = Nb, Ta, and V; and Y = S, and Se) by ab initio molecular dynamics

Regular Article

Abstract

In this work, we present a structural and dynamic characterisation of six different types of sulvanites Cu3XY4 with X = Nb, V and Ta, and Y = S and Se. These materials have been the subject of intense study in recent times primarily as potential candidates for solar cell devices, as well as for their enhanced opto-electrical properties. Here, by means of first-principles calculations, we study the structural and dynamic behaviour of these materials at different temperatures, which is important for use of these materials in high-temperature conditions. In this work the dynamic and structural properties are studied using the Density Functional Theory technique. The simulations were performed at four different temperatures, ranging from room temperature to ~1500 K. By using first-principles molecular dynamics in the microcanonical ensemble, we are able to determine the vibrational spectra of these sulvanites. With this information we report for the first time the partial vibrational density of states of these structures at different temperatures. With these results we determine the vibrational properties of the basic building blocks of those sulvanites and their dynamic behaviour under temperature effects. We also show that the building blocks that which make up these structures, remain stable as the temperature increases.

Keywords

Solid State and Materials 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.Departamento de Física, Facultad de Ciencias Exactas, Universidad Andres BelloSantiagoChile
  2. 2.Instituto Tecnológico Metropolitano ITMMedellínColombia

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