Synthesis, X-Ray Diffraction (XRD), Differential Thermal Analysis (DTA), and Scanning Electron Microscopy (SEM) of the Alloy (CuInTe2)1-x(NbTe)x with x=0.5

  • Gerzon E. Delgado Laboratorio de Cristalografía, Departamento de Química, Facultad de Ciencias, Universidad de Los Andes
  • Miguel Palmera Centro Nacional de Tecnologías Ópticas (CNTO) y Centro Investigaciones de Astronomía (CIDA)
  • Pedro Grima-Gallardo Centro Nacional de Tecnologías Ópticas (CNTO) y Centro Investigaciones de Astronomía (CIDA), Mérida 5101 c Centro de Estudios en Semiconductores, Departamento de Física, Facultad de Ciencias, Universidad de Los Andes
  • Miguel Quintero Centro de Estudios en Semiconductores, Departamento de Física, Facultad de Ciencias, Universidad de Los Andes
Keywords: chalcogenide alloys; superconductor; thermal analysis; crystal structure; powder X-ray diffraction; Rietveld method

Abstract

A polycrystalline ingot (30mm long, 10mm diameter) of the alloy (CuInTe2)1-x(NbTe)x with x=0.5 has been produced using the melt and anneal technique and characterized by X-Ray Diffraction (XRD), Diferential Thermal Analysys (DTA) and Scanning Electron Microscopy (SEM). From XRD results, and using Rietveld refinement method, the crystal structure has been obtained indicating than this alloy crystallizes in a chalcopyrite-like structure, space group  (Nº 112), unit cell parameters a = 6.1933(2) Å, c = 12.4293(2) Å, V = 476.75(2) Å3, figures of merit Rexp= 6.7%, Rp= 7.5%, Rwp= 7.3%, and S = 1.1. DTA measurements indicate three thermal transitions at 1028, 977 and 886 K in the heating cycle, and 1016, 900 and 848 K in the cooling. The transitions at 1028 and 1016 correspond to the melting and solidification point, respectively; the transitions at 977 and 900 K are of solid to liquid+solid type, whereas the transitions at 886 and 848 K correspond to order-disorder. The melting point is incongruent. In the diffraction pattern, traces of a secondary phase are observed; this phase has been identified using SEM technique as (CuIn)0.5NbTe2.

DOI: http://dx.doi.org/10.17807/orbital.v14i1.1670

Published
2022-04-08
How to Cite
Delgado, G. E., Palmera, M., Grima-Gallardo, P., & Quintero, M. (2022). Synthesis, X-Ray Diffraction (XRD), Differential Thermal Analysis (DTA), and Scanning Electron Microscopy (SEM) of the Alloy (CuInTe2)1-x(NbTe)x with x=0.5. Orbital: The Electronic Journal of Chemistry, 14(1), 33-39. Retrieved from https://periodicos.ufms.br/index.php/orbital/article/view/15499