Structure of silver iodide/silver selenate fast-ion-conducting glasses : neutron diffraction experiments.

Journal Article · Mon Jul 20 04:00:00 EDT 1998 · J. Phys.: Cond. Matter

DOI:https://doi.org/10.1088/0953-8984/10/28/005· OSTI ID:938310

Cramer, C; Price, D L; Saboungi, M -L

Structure factors, S(Q), of many fast-ion-conducting glasses show peaks at very low momentum-transfer values,{Dirac_h}Q , which can be attributed to a characteristic intermediate-range order. We report on a neutron diffraction study of the fast-ion-conducting glass-forming system x(AgI){sub 2} x (1-x)Ag{sub 2}SeO{sub 4} with x {approx} 0.5 in the glassy, partly crystallized, and liquid states. The structure factors of the glass and the melt are similar: the very-low-Q peak (VLQP) at Q {approx} 0.75 Angstroms{sup -1} survives the melting process and shifts towards higher Q-values with increasing temperature. The partly crystallized glasses show Bragg peaks at around 0.8 Angstroms{sup -1}, whereas no intensity in this Q-range has been observed for crystalline silver selenate. In the glasses, the intensity of the VLQP increases with AgI content and its position shifts towards lower Q. The origin of this peak is discussed. The peaks observed in S(Q) are assigned to various ionic species, and coordination numbers for these species, are derived from the total pair correlation functions, T(r).

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: ER
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 938310
• Report Number(s): ANL/MSD/JA-29213
• Journal Information: J. Phys.: Cond. Matter, Journal Name: J. Phys.: Cond. Matter Journal Issue: 28 ; Jul. 20. 1998 Vol. 10; ISSN 0953-8984; ISSN JCOMEL
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
IONIC CONDUCTIVITY
METALLIC GLASSES
NEUTRON DIFFRACTION
PHASE STUDIES
SELENATES
SILVER COMPOUNDS
SILVER IODIDES
STRUCTURE FACTORS