### Abstract

IR spectra, calculated by the ion dynamics computer simulation method (IDCS), are presented for a variety of pair potential models of silica. A number of factors entering the determination of the reliability of the calculated spectral frequencies and line.shapes are investigated. Major differences are found between characteristic IR frequencies calculated from the different pair potentials, all of which give comparable radial distribution functions. All pair models have a common failing: they predict principal IR peak separations which are too small. We relate this finding to a common failure of pair models to account for the experimental intertetrahedral bond angle. The greater sensitivity to pair potential of the IR spectrum over radial distribution function is consistent with the proposed sensitivity series: structure < spectra < relaxation which may be associated with features of the potential which determine these different classes of properties.

Original language | English (US) |
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Pages (from-to) | 236-249 |

Number of pages | 14 |

Journal | Journal of Non-Crystalline Solids |

Volume | 217 |

Issue number | 2-3 |

State | Published - Sep 1997 |

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### ASJC Scopus subject areas

- Ceramics and Composites
- Electronic, Optical and Magnetic Materials

### Cite this

**IR absorption of silicate glasses studied by ion dynamics computer simulation. I. IR spectra of SiO _{2} glass in the rigid ion model approximation.** / Hemmati, Mahin; Angell, Charles.

Research output: Contribution to journal › Article

_{2}glass in the rigid ion model approximation',

*Journal of Non-Crystalline Solids*, vol. 217, no. 2-3, pp. 236-249.

}

TY - JOUR

T1 - IR absorption of silicate glasses studied by ion dynamics computer simulation. I. IR spectra of SiO2 glass in the rigid ion model approximation

AU - Hemmati, Mahin

AU - Angell, Charles

PY - 1997/9

Y1 - 1997/9

N2 - IR spectra, calculated by the ion dynamics computer simulation method (IDCS), are presented for a variety of pair potential models of silica. A number of factors entering the determination of the reliability of the calculated spectral frequencies and line.shapes are investigated. Major differences are found between characteristic IR frequencies calculated from the different pair potentials, all of which give comparable radial distribution functions. All pair models have a common failing: they predict principal IR peak separations which are too small. We relate this finding to a common failure of pair models to account for the experimental intertetrahedral bond angle. The greater sensitivity to pair potential of the IR spectrum over radial distribution function is consistent with the proposed sensitivity series: structure < spectra < relaxation which may be associated with features of the potential which determine these different classes of properties.

AB - IR spectra, calculated by the ion dynamics computer simulation method (IDCS), are presented for a variety of pair potential models of silica. A number of factors entering the determination of the reliability of the calculated spectral frequencies and line.shapes are investigated. Major differences are found between characteristic IR frequencies calculated from the different pair potentials, all of which give comparable radial distribution functions. All pair models have a common failing: they predict principal IR peak separations which are too small. We relate this finding to a common failure of pair models to account for the experimental intertetrahedral bond angle. The greater sensitivity to pair potential of the IR spectrum over radial distribution function is consistent with the proposed sensitivity series: structure < spectra < relaxation which may be associated with features of the potential which determine these different classes of properties.

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M3 - Article

AN - SCOPUS:0031222713

VL - 217

SP - 236

EP - 249

JO - Journal of Non-Crystalline Solids

JF - Journal of Non-Crystalline Solids

SN - 0022-3093

IS - 2-3

ER -