Devitrification and metastability: Revisiting the phase diagram of the system AgI:Ag{sub 2}MoO{sub 4}
- Univ. di Pavia (Italy)
The phase diagram of the AgI{sub 1{minus}x}(Ag{sub 2}MoO{sub 4}){sub x} system has been investigated by differential scanning calorimetry (DSC) and X-ray powder diffraction (XRD). Besides an incongruent 1:1 compound that was previously reported by the authors` group, a metastable 2:1 crystalline phase is formed at {approximately}110 C over the whole composition range. The stability of this phase is strongly temperature-controlled: at {approximately}180 C the crystal decomposes in the time scale of a DSC experiment. For x < 0.5 it gives {beta}-AgI and the 1:1 compounds, whereas for x > 0.5 the 1:1 and Ag{sub 2}MoO{sub 4} are formed. The glass-forming region spans over the range 0.20 < x < 0.40. Annealing the samples with 0 {le} x 0.33 near 70 C causes all AgI in excess with respect to the 2:1 compounds to crystallize as {beta} phase.
- OSTI ID:
- 305392
- Journal Information:
- Journal of Solid State Chemistry, Vol. 140, Issue 1; Other Information: PBD: Oct 1998
- Country of Publication:
- United States
- Language:
- English
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