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Lattice-mechanical properties of ammonium halides

Механические свойства решетки кристаллов галогенидов аммония

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Il Nuovo Cimento B (1971-1996)

Summary

A three-body force shell model (TSM) has been employed to describe several lattice-mechanical properties of ammonium halide crystals. The predictions achieved with this 8-parameter TSM for the phonon dispersion, cohesive and dielectric properties of these crystals are distinctly better than with various other multiparameter models. This success has been considered remarkable as the TSM has reproduced equally well the dispersion of phonons in the rocksalt and cesium chloridetype ammonium halides.

Riassunto

Si è usato un modello a strati di forza a tre corpi (TSM) per descrivere parecchie proprietà di meccanica reticolare dei cristalli degli alogenuri di ammonio. Le previsioni ottenute con questo modello TSM ad 8 parametri per le proprietà di dispersione fononica, coesive e dielettriche di questi cristalli sono chiaramente migliori di quelle di molti altri modelli a molti parametri. Questo successo è stato considerato notevole poichè il TSM ha riprodotto ugualmente bene la dispersione fononica nel salgemma e in alogenuri di ammonio del tipo del cloruro di cesio.

Резюме

Оболочечная модель трехчастичных сил используется для описания некоторых механических свойств рещетки кристаллов галогенидов аммония. Предсказания, полученные с помошью предложенной восьмипараметрической модели трехчастичных сил для дисперсии фононов, когезионных и диэлектрических свойств этих кристаллов оказываются значительно лучше, чем различные другие многопаметрические модели. Предложенная оболоченая модель трехчастичных сил также успешно воспроизводит дисперсию фононов в каменной соли и в хлориде цезия.

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Author notes

  1. J. P. S. Rana

    Present address: Physics Department, S. V. College (Agra University), Aligarh, India

Authors and Affiliations

  1. Department of Post Graduate Studies and Research in Physics, University of Jabalpur, 482001, Jabalpur, India

    R. K. Singh & J. P. S. Rana

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Singh, R.K., Rana, J.P.S. Lattice-mechanical properties of ammonium halides. Nuov Cim B 57, 177–192 (1980). https://doi.org/10.1007/BF02722409

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