INTECIN 20395
INSTITUTO DE TECNOLOGIAS Y CIENCIAS DE LA INGENIERIA "HILARIO FERNANDEZ LONG"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Analyzes of the structure of Agx(Ge0.25Se0.75)1-x bulk glasses employing 119Sn Mössbauer effect and EXAFS
Autor/es:
J. M. CONDE GARRIDO; E. LEDE; M. A. UREÑA; J. A. ROCCA; B. ARCONDO
Lugar:
La Plata
Reunión:
Conferencia; Humboldt Kolleg (HK 2010) - International Conference on Physics; 2011
Resumen:
The zone rich in Se in the equilibrium phase diagram of Ag-Ge-Se system presents a large gap of miscibility in the liquid phase that solidifies, upon a fast cooling process, as an intrinsically inhomogeneous glass. The non-homogeneous morphology of these glasses depends on the atomic fraction of Ag (x). These glasses consist of Ag rich zones surrounded by a Ag depleted matrix for x < 0.08 whereas they consist of Ag depleted zones surrounded by a Ag rich matrix for x > 0.10. Evidence of a spinodal decomposition is observed for 0.08 ≤ x ≤ 0.10. On the other hand, these glasses present an abrupt change in their conductivity at x ≈ 0.08. They are semiconductors for x
