Rings in central-force network dynamics
1983; American Physical Society; Volume: 28; Issue: 10 Linguagem: Inglês
10.1103/physrevb.28.5802
ISSN1095-3795
Autores Tópico(s)Material Dynamics and Properties
ResumoThe central-force network dynamics model for glasses is extended to treat networks involving small regular rings of bonds. In particular, band-limit formulas are obtained for an ${A}_{2}{X}_{3}$ glass consisting of regular puckered six-membered ${A}_{3}{X}_{3}$ rings. The special case of planar rings is compared with observations on vitreous ${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$. This continuous random network of "boroxol" rings shows improved agreement with experiment over a model not containing rings. The remaining discrepancies illustrate the need to include noncentral forces in the network dynamics of $v$-${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$.
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