INTECIN   20395
INSTITUTO DE TECNOLOGIAS Y CIENCIAS DE LA INGENIERIA "HILARIO FERNANDEZ LONG"
Unidad Ejecutora - UE
artículos
Título:
Analyses of intrinsic heterogeneities and metal segregation in samples of Ag-Ge-Se glasses
Autor/es:
J.M. CONDE-GARRIDO; J.ROCCA; M.ERAZU; M.A. UREÑA; M. FONTANA; B.ARCONDO
Revista:
PHYSICA B - CONDENSED MATTER
Editorial:
Elsevier
Referencias:
Año: 2009 vol. 404 p. 2816 - 2818
ISSN:
0921-4526
Resumen:
GeySe(1-y)
glasses are semiconductors but when Ag is added above certain
threshold concentration, Agx[GeySe(1-y)](100-x)
glasses behave as fast ionic conductors [1]. This peculiar behavior
may be attributed to the intrinsically inhomogeneous nature of these
glasses where zones rich in metals coexist with zones of the host
material. The conductivity transformation may be ascribed to the
percolation of the Ag rich phase [2].Agx[Ge0.25Se0.75](100-x)
glasses either massive or as films were obtained by melt quenching and
pulsed laser deposition respectively in compositions belonging to the
Se rich corner of the ternary phase diagram. Their amorphous nature and
intermediate range order was checked employing X-ray diffractometry
(XRD), the short range order was characterized by Extended X-ray
Absorption Fine Structure (EXAFS) (Ge and Se K absorption border), and
their microstructure was characterized by Scanning Electron Microscopy
(SEM) and Small Angle X-ray Scattering (SAXS).