Neutron thermodiffraction study of the crystallization of Ag–Ge–Se glasses: evidence of a new phase - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Physics: Condensed Matter Année : 2008

Neutron thermodiffraction study of the crystallization of Ag–Ge–Se glasses: evidence of a new phase

Résumé

Silver-containing chalcogenide glasses are potential candidates for electrical memory manufacturing. In order to study the glasses under dynamic conditions, using the temperature as the main parameter, a neutron thermodiffraction study of three Agx(Ge0.25Se0.75)100−x glasses (x = 5, 15 and 25) was carried out. Two in situ diffraction experiments were performed: a first series including heating ramps from room temperature up to 350 C and a second one comprising the measurement of an isotherm at about 300 C for 5 h. For the three studied glasses two stable crystalline phases were formed during the heating process: the cubic Ag8GeSe6 appeared first, followed by the crystallization of monoclinic GeSe2. The crystallization process for the Ag-rich (x = 15 and 25) glasses was more complex, with the appearance of a new unstable phase at high temperature, i.e. Ag2GeSe3. Such a phase decomposed with time or temperature to produce a new phase, Ag10Ge3Se11, along with the stable GeSe2. This phase has never been reported to date while the existence of Ag2GeSe3 was still controversial.
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Dates et versions

hal-00263442 , version 1 (12-03-2008)

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Andrea Piarristeguy, Gabriel J. Cuello, Pascal G. Yot, Michel Mr Ribes, Annie Ap Pradel. Neutron thermodiffraction study of the crystallization of Ag–Ge–Se glasses: evidence of a new phase. Journal of Physics: Condensed Matter, 2008, 20, pp.155106. ⟨10.1088/0953-8984/20/15/155106⟩. ⟨hal-00263442⟩
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