PERSONAL DE APOYO
ROCCA Javier Alejandro
artículos
Título:
Analyses of intrinsic inhomogeneity and metal segregation in samples of AgGeSe glasses
Autor/es:
J. M. CONDE GARRIDO; J. A. ROCCA; M. ERAZÚ; M. A. UREÑA; M. FONTANA; B. ARCONDO
Revista:
PHYSICA B - CONDENSED MATTER
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2009 p. 2816 - 2818
ISSN:
0921-4526
Resumen:
ySe(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 [Ureña et al., Solid State
Ionics 176 (2005) 505]. 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
[Pradel et al., J. Phys.: Condens. Matter 15 (2003) S1561].
Agx[Ge0.25Se0.75](100−x)
glasses either massive or as films were obtained by melt quenching and
pulsed laser deposition (PLD), 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 edge) and their microstructure was characterized by scanning
electron microscopy (SEM) and small angle X-ray scattering (SAXS).