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Rev. LatinAm. Metal. Mat. 2021, 41(1): 50-59

ESTUDIO ESTRUCTURAL Y DIAGRAMA DE FASES DEL SISTEMA DE ALEACIONES Cu2Zn1-zMnzSnSe4

Manuel Antonio Villarreal Uzcategui, Ekadink Moreno, Miguel Quintero, Eugenio Quintero, Manuel Morocoima, Gerzon Delgado, Jines Contreras, Miriam Chourio

Online: 01-05-2021

GA-1044

Abstract


Se reporta el estudio estructural y el diagrama de fases del sistema de aleaciones Cu2Zn1-zMnzSnSe4. Las muestras policristalinas se sintetizaron utilizando la técnica de fusión directa y recocido a partir de los elementos constituyentes. El análisis por difracción de rayos-X indica que el sistema cristaliza en la estructura tetragonal estannita con grupo espacial I4 ̅2m. A partir de los puntos experimentales del análisis térmico diferencial (ATD) se construyó el diagrama de fases del sistema, el cual sugiere que la región entre 600 y 700 ºC es bifásica coexistiendo las fases estannita y wurtz-estannita (+). La descomposición peritéctica del sistema   (L+ZnSe) en la región entre z = 0 y z  0.80 ocurre a  800 ºC; para z > 0.80 la temperatura peritéctica disminuye hasta  700 ºC a z = 1.0. La transición de líquido L a (L+ZnSe), está dada por la línea frontera entre 1075 ºC a z = 0 y 770 ºC a z  0.80. La región del diagrama por debajo de los 600 ºC corresponde a la aparición de la fase tetragonal estannita, como lo indica el estudio por difracción de rayos-X a temperatura ambiente.


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