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The stabilities and electronic structures of AlnSi12−nN12 (n = 0, 1, 2, and 4)

Published online by Cambridge University Press:  07 January 2016

Huihui Yang  and
Hongshan Chen
Huihui Yang
Affiliation:
College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, Gansu, China
Hongshan Chen*
Affiliation:
College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, Gansu, China
*
a)Address all correspondence to this author. e-mail: chenhs@nwnu.edu.cn
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Abstract

AlnSi12−nN12 (n = 0, 1, 2, and 4) are electron redundant systems. The calculations show that the stabilities of AlnSi12−nN12 and Al12N12 are very close. One Si atom in each Si2N2 square protrudes obviously and the cages are distorted. The excess electrons reside at the outside of the protrudent Si atoms as lone pair electrons. They occupy antibonding orbitals and form the highest occupied band. The Si–N bonds are covalent bonds with strong polarity. The overlap integral is 0.38 per Si–N bond and is 17% stronger than the overlap in Al12N12. The atoms in molecule charge on the in-plane and protrudent Si atoms are 3.13e and 1.65e, respectively. The lone pair electrons form large local dipole moments enhance the electrostatic interaction between the protrudent Si and N atoms. The energy gaps of the electron redundant cages AlnSi12−nN12 (n = 0, 1, 2, and 4) are about 1 eV smaller than the gap of Al12N12. As the lone pair electrons are loosely bond, the SiN-based cages have large hyper-polarizabilities and so have potential applications, such as nonlinear optical materials.

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Articles
Information
Journal of Materials Research , Volume 31 , Issue 2 , 28 January 2016 , pp. 241 - 249
Copyright
Copyright © Materials Research Society 2016 

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