Intermediate- and extended-range order in phosphate glasses
- Japan Atomic Research Institute, Ako, Hyogo (Japan)
- Argonne National Lab., IL (United States)
- Iowa State Univ., Ames, IA (United States). Dept. of Materials Science and Engineering
The structure of sodium ultraphosphate glasses, (Na{sub 2}O){sub x}(P{sub 2}O{sub 5}){sub 100-x} (x = 0, 10, 20), and alkali metaphosphate glasses, MePO{sub 3} (Me = Li, Na, K, Rb and Cs) have been studied by neutron diffraction. Structural features in the neutron structure factors S(Q) characteristic of intermediate-range (Q {approx_lt} 3 {angstrom}{sup -1}) order were identified. The feature of intermediate-range order in the pure phosphate glass (v-P{sub 2}O{sub 5}) is accounted for by the P{sub 4}O{sub 10} molecule packing model. The addition of the alkali metal modifier, Na, has drastic affect on the intermediate-range structure due to destruction of the PO{sub 4} network structure. Around x {approximately} 50 a new peak arises at lower Q than the intermediate-range order peak, which is found in the S(Q)`s of all alkali metaphosphate glasses, associated with extended-range order. The length scale of extended-range order increases with Me{sup +} size. These phenomena can be explained by the behavior of oxygen atoms. i.e. PO{sub 4} chain-like units ordering around the Me{sup +}.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 539889
- Report Number(s):
- ANL/MSD/CP--94552; CONF-9709101--; ON: DE98000650; CNN: Grant DMR94-20561
- Country of Publication:
- United States
- Language:
- English
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