Dissolution dynamics of AgGeSe chalcogenide glasses in basic aqueous solu

A. ROMERO; JUAN MANUEL CONDE GARRIDO; O. CUELLAR RODRIGUEZ; JOSEFINA M. SILVEYRA; M. A. UREÑA

Saint Malo

Conferencia; 15th International Conference on the Physics of Non-Crystalline Solids y 14th conference organized by the European Society of Glass (PNCS-ESG 2018); 2018

Chalcogenide glasses are amorphous materials used in great variety of applications: infrared optics, chemical sensors, gas sensors, phase change memories, solid-state electrolytes, etc.In previous works, our group has discovered that Agx(Ge0,25Se0,75)1−x (at. %) bulk glasses are heterogeneous and consist of two phases: a Ag-rich phase and a Ag-poor phase. In the range of compositions 0.08 < x < 0.1, the glasses suffer a spinodal decomposition upon solidification. Outside this range, a binodal decomposition takes place.A high resistance to acidic media characterizes these materials but they are corroded by basic solutions. Our group has shown in previous works that the Ag-poor phase is more easily corroded than the Ag-rich phase.In this work, 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 order and the activation energy.