Devitrification and metastability: Revisiting the phase diagram of the system AgI:Ag{sub 2}MoO{sub 4}

Journal Article · Thu Oct 01 04:00:00 EDT 1998 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1998.7867· OSTI ID:305392

Tomasi, C; Mustarelli, P; Magistris, A ^[1]

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1. 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, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 140; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
36 MATERIALS SCIENCE
CALORIMETRY
COMPOSITE MATERIALS
ELECTRIC BATTERIES
EXPERIMENTAL DATA
GLASS
MOLYBDENUM OXIDES
PHASE STUDIES
SILVER IODIDES
SILVER OXIDES
X-RAY DIFFRACTION