INTECIN   20395
INSTITUTO DE TECNOLOGIAS Y CIENCIAS DE LA INGENIERIA "HILARIO FERNANDEZ LONG"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Dissolution dynamics of AgGeSe chalcogenide glasses in basic aqueous solutions
Autor/es:
MA UREÑA; A ROMERO; JM CONDE GARRIDO; O CUELLAR RODRIGUES; JM SILVEYRA
Lugar:
Saint-Malo
Reunión:
Congreso; PNCS-ESG 2018; 2018
Resumen:
Chalcogenideglasses are amorphous materials used in great variety of applications: infraredoptics, chemical sensors, gas sensors, phase change memories, solid-stateelectrolytes, etc.In previousworks, our group has discovered that Agx(Ge0,25Se0,75)1−x (at. %) bulk glasses areheterogeneous and consist of two phases: a Ag-rich phase and a Ag-poorphase.  In the range of compositions 0.08< x < 0.1, the glasses suffer a spinodal decomposition uponsolidification. Outside this range, a binodal decomposition takes place.A highresistance to acidic media characterizes these materials but they are corrodedby basic solutions. Our group has shown in previous works that the Ag-poorphase is more easily corroded than the Ag-rich phase.In thiswork, we studied bulk AgGeSe glasses with x = 0 and 10 by immersing them in KOH(0.3M) solutions at various temperatures. We observed the samples by SEM,measured the mass loss as a function of time, and estimated the reaction orderand the activation energy.