TY - JOUR
T1 - Quantum-chemical study of the structure and properties of hypothetical superhard materials based on the cubic silicon-carbon nitrides
AU - Musin, R. N.
AU - Musaev, D. G.
AU - Lin, Ming-Chang
PY - 1999/2/4
Y1 - 1999/2/4
N2 - Density functional B3LYP/6-31G(d,p) calculations have been carried out to study the structural peculiarities and physical properties of the series of cubic (defect zinc-blende) silicon-carbon nitrides with composition SixC3-xN4 (x = 0, 1, 2, 3). As model systems, we have considered six clusters with the structure of the adamantane molecule (CH)4(CH2)6 (I), hexamethylenetetramine-like molecules N4(CH2)6-n(SiH2)n (II-V) (n = 0, 2, 4, 6), and silicon-substituted adamantane molecule (SiH)4(SiH2)6 (VI). These 10 heavy-atom clusters have been used to simulate the crystalline fragments of diamond (I), cubic (defect zinc-blende) silicon-carbon nitrides (II-V), and cubic (zinc-blende) silicon solid (VI). It was found that the full B3LYP/6-31G(d,p) geometry optimization of these clusters allow us to reproduce the structures, unit cell parameters, and bulk modulus (hardness) of real crystals (I and VI) quite well and to predict the structural and mechanical properties of the hypothetical crystalline compounds (II-V).
AB - Density functional B3LYP/6-31G(d,p) calculations have been carried out to study the structural peculiarities and physical properties of the series of cubic (defect zinc-blende) silicon-carbon nitrides with composition SixC3-xN4 (x = 0, 1, 2, 3). As model systems, we have considered six clusters with the structure of the adamantane molecule (CH)4(CH2)6 (I), hexamethylenetetramine-like molecules N4(CH2)6-n(SiH2)n (II-V) (n = 0, 2, 4, 6), and silicon-substituted adamantane molecule (SiH)4(SiH2)6 (VI). These 10 heavy-atom clusters have been used to simulate the crystalline fragments of diamond (I), cubic (defect zinc-blende) silicon-carbon nitrides (II-V), and cubic (zinc-blende) silicon solid (VI). It was found that the full B3LYP/6-31G(d,p) geometry optimization of these clusters allow us to reproduce the structures, unit cell parameters, and bulk modulus (hardness) of real crystals (I and VI) quite well and to predict the structural and mechanical properties of the hypothetical crystalline compounds (II-V).
UR - http://www.scopus.com/inward/record.url?scp=0000093331&partnerID=8YFLogxK
U2 - 10.1021/jp9842300
DO - 10.1021/jp9842300
M3 - Article
AN - SCOPUS:0000093331
SN - 1520-6106
VL - 103
SP - 797
EP - 803
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
IS - 5
ER -