Phosphorus carbides: theory and experiment.
Dalton Trans
; (19): 3085-92, 2004 Oct 07.
Article
em En
| MEDLINE
| ID: mdl-15452635
ABSTRACT
The recent finding that radio frequency plasma activation of CH(4)/PH(3) gas mixtures can yield films with P C ratios < or = 3 has served to trigger further research into new 'phosphorus carbide' materials. Theoretical and experimental results relating to periodic and amorphous materials, respectively, are presented here (i) The electronic structure and stability of different crystalline phosphorus carbide P(x)C(y) phases have been studied using first-principles density-functional theory. Calculations have been carried out for P(4)C(3+8 n) (n= 0-4), PC, and PC(3) and the most likely periodic structures examined in detail. Particular attention is paid to the composition PC(3), for which there are several possibilities of similar energy. (ii) Recent experimental efforts have involved use of pulsed laser ablation methods to produce hydrogen-free phosphorus carbide thin films. Mechanically hard, electrically conducting diamond like carbon films containing 0- approximately 26 at.% P have been deposited on both Si and quartz substrates by 193 nm PLA of graphite/phosphorus targets (containing varying percentages of phosphorus), at a range of substrate temperatures (T(sub)= 298-700 K), in vacuum, and analysed via laser Raman and X-ray photoelectron spectroscopy.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Dalton Trans
Assunto da revista:
QUIMICA
Ano de publicação:
2004
Tipo de documento:
Article