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Auxetic Properties of a f.c.c. Crystal of Hard Spheres with an Array of [001]‐Nanochannels Filled by Hard Spheres of Another Diameter (Phys. Status Solidi B 1/2019)
Author(s) -
Narojczyk Jakub W.,
Wojciechowski Krzysztof W.,
Tretiakov Konstantin V.,
Smardzewski Jerzy,
Scarpa Fabrizio,
Piglowski Pawel M.,
Kowalik Mikolaj,
Imre Attila R.,
Bilski Mikolaj
Publication year - 2019
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201970012
Subject(s) - tetragonal crystal system , spheres , auxetics , materials science , crystal (programming language) , hard spheres , symmetry (geometry) , cubic crystal system , crystal structure , condensed matter physics , nanotechnology , crystallography , physics , geometry , composite material , chemistry , mathematics , thermodynamics , astronomy , computer science , programming language
Simple structural modifications can essentially affect the auxetic properties of materials, see article no. 1800611 by Jakub W. Narojczyk et al. The Poisson's ratio (PR) of a f.c.c. crystal of unit‐diameter hard spheres (green in the cover image) with a periodic array of nanochannels filled by hard spheres of another diameter (red) has been studied at high pressure. The resulting nanocomposite shows tetragonal symmetry. When the ‘inclusion’ spheres are by 9% greater than the ‘matrix’ spheres, the minimum value of PR, ≈–0.87, is significantly lower than its value, ≈–0.06, obtained for identical spheres. The blue surfaces illustrate (in spherical coordinates) the most negative PR value in various directions of the applied external stress, for the cubic crystal (left) and tetragonal crystal (right), respectively.