Intermolecular correlations and mean square relative displacements in C60 fullerite

We study molecular properties of the high-temperature modification of fullerites. In the present work we calculate the intermolecular correlations and the mean square relative displacements in C60. The Girifalco intermolecular potential is utilized. The calculations have been made in the whole interval from the equilibrium point with orientationally ordered phase up to the spinodal temperature. To take into account the lattice anharmonicity we use the correlative method of unsymmetrized self-consistent field. Its second order allows one to investigate correlations in fcc lattice between the nearest, second, third and fourth neighbors. The anharmonicity has strong effect on the intermolecular correlations at T > 700 K, causing their drastic rise near the spinodal point. The dependence of the correlation moments on the distance between molecules and on the crystallographic direction is considered. We compare our results with those for solid Ar and discuss the influence of a special feature of the interaction potentials on the intermolecular correlations and the mean sauare molecular displacements.

Авторы
Zubov V.I. 1, 2 , Rodrigues C.G.3
Редакторы
-
Издательство
-
Номер выпуска
2
Язык
Английский
Страницы
471-481
Статус
Опубликовано
Подразделение
-
Номер
-
Том
222
Год
2000
Организации
  • 1 Instituto de Física, Universidade Federal de Goiás, C.P. 131, 74001 Goiânia-GO, Brazil
  • 2 Department of Theoretical Physics, People's Friendship University, Moscow, Russian Federation
  • 3 Nucleo de Pesquisa em Fis. da U., Goiânia-GO, Brazil
Ключевые слова
-
Дата создания
19.10.2018
Дата изменения
19.10.2018
Постоянная ссылка
https://repository.rudn.ru/ru/records/article/record/481/