Síntesis, análisis térmico y caracterización estructural del compuesto ternario Ag2SnTe3. / Synthesis, thermal analysis and structural characterization of the ternary compound Ag2SnTe3.

• Gerzon-E Delgado Universidad de Los Andes
• Maria Pirela Universidad de Los Andes
• Ana Velásquez Universidad de Los Andes
• Manuel Villarreal Universidad de Los Andes
• Braulio Fernández Universidad de Los Andes
• Pedro Grima-Gallardo Universidad de Los Andes

Palabras clave: Calcogenuros, Síntesis química, Análisis térmico, Difracción de rayos-X en muestras policristalinas, Estructura cristalina, Chalcogenides, Chemical synthesis, Thermal analysis, X-ray powder diffraction, Crystal structure.

Resumen

Resumen

El compuesto ternario Ag2 SnTe3 ha sido sintetizado e investigado mediante difracción de rayos-X en muestras policristalinas y su estructura cristalina ha sido refinada utilizando el método Rietveld. El análisis térmico diferencial indica que su punto de fusión es 343 °C. El patrón de difracción se compone de 86,5 % de la fase principal Ag2 SnTe3 y 13,5 % de una fase secundaria identificada como el binario SnTe. El compuesto Ag2 SnTe3 cristaliza en el grupo espacial monoclínico Cc (Nº 9), Z = 4, con parámetros de celda unidad a = 7,4420(1) Å, b = 12,8377(1) Å, c = 7,4025(1) Å, β = 109,54(1) °, y V =666,5(2) Å3 . El refinamiento de 36 parámetros instrumentales y estructurales convergió a las figuras de mérito Rp = 8,1 %, Rwp = 9,6 %, Rexp = 7,1 %, S = 1,4, para 5501 intensidades y 290 refecciones independientes. La estructura del ternario Ag2 SnTe3 puede ser descrita como un compuesto adamantano derivado de la estructura esfalerita

Abstract

The ternary compound Ag2 SnTe3 has been synthesized and investigated by means of X-ray powder diffraction and its structure has been refined by the Rietveld method. The thermal differential analysis indicates a melting point of 343 ºC for this compound. The powder pattern was composed by 86.5% of the principal phase Ag2 SnTe3 and 13.5% of a secondary phase identified as the binary SnTe. The compound Ag2 SnTe3 crystallizes in the monoclinic space group Cc (Nº 9), Z = 4, with unit cell parameters a = 7.4420(1) Å, b = 12.8377(1) Å, c = 7.4025(1) Å, β = 109.54(1) °, and V =666.5(2) Å3 . The refinement of 36 instrumental and structural parameters converged to Rp = 8.1 %, Rwp = 9.6 %, Rexp = 7.1 %, S = 1.4, for 5501 step intensities and 290 independent reflections. The structure of Ag2 SnTe3 can be described as an adamantane compound derivative of the sphalerite structure

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