On the Interatomic Correlations and Mean Square Relative Atomic Displacements in an Anharmonic BCC Crystal

An overview of the interatomic correlation moments and the mean square relative atomic displacements in anharmonic crystals

“…The melting temperature of Na is 373 K. For temperatures less than 50 K, Na has another crystal structure. For this reason, we investigated the QCM and MSRD in the temperature range between 50 K and 373 K [49,52]. It is seen that some momenta are negative, implying that the corresponding atoms oscillate in such a direction for the most part opposite in phase.…”

Interatomic correlations moments of atoms in the two-dimensional hexagonal lattice by using Morse and Lenard–Jones potentials

“…Based on the Correlative Method of Unsymmetrized Self-Consistent Field (CUSF, for short) [3][4][5][6][7] general formulae were derived for quadratic correlation moments between atomic displacements from lattice points in crystals taking into account anharmonic terms up to the fourth order [8][9][10], and have used them for calculations of these characteristics in the linear chain [9,11], twodimensional [10] and three-dimensional [12][13][14][15][16][17] models.…”