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Molecular orbital calculations of chemical bonding states of solute elements in amorphous silicon nitride ceramics

Published online by Cambridge University Press:  31 January 2011

Katsuyuki Matsunaga
Affiliation:
Fine Ceramics Research Association, Synergy Ceramics Laboratory, 2–4-1 Mutsuno Atsuta-ku, Nagoya 456-8587, Japan
Yuji Iwamoto
Affiliation:
Fine Ceramics Research Association, Synergy Ceramics Laboratory, 2–4-1 Mutsuno Atsuta-ku, Nagoya 456-8587, Japan
Hideaki Matsubara
Affiliation:
Fine Ceramics Research Association, Synergy Ceramics Laboratory, 2–4-1 Mutsuno Atsuta-ku, Nagoya 456-8587, Japan
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Abstract

We performed ab initio Hartree–Fock molecular orbital calculations of solute elements in amorphous silicon nitride (Si–N) ceramics. To investigate effects of solute elements, X, such as boron, carbon, aluminum, silicon, and phosphorus, on stabilization of the Si–N network, we used model clusters representing local atomic structures in the Si–N network, and the solute elements were substituted for nitrogen. Bonding characteristics around the solute elements were analyzed, and bond energies of Si–X were also calculated using model clusters. It was found that, among these solute elements in amorphous Si–N, the Si–C bond is able to make the Si–N network more stable due to its high covalency.

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Articles
Copyright
Copyright © Materials Research Society 2000

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