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JMR Abstracts: September 1998
Communication
Screen printed
Cu3BiS3-polyacrylic acid
composite coatings
H. Hu, O. Gomez-Daza, P.K. Nair
(Universidad Nacional AutÛnoma de Mexico)
A technique
for preparing electrically conductive coatings of
Cu3BiS3 powder in
polyacrylic acid matrix is presented.
Bi2S3 powder obtained by
chemical precipitation was introduced into a freshly prepared CuS chemical
deposition bath. After the initial nucleation period, CuS started to
deposit on the Bi2S3
surface. The as obtained
CuS-Bi2S3 powder was mixed
with polyacrylic acid aqueous solution and the resulting mixture was used
as a paste to form a screen printed composite coating. Up to 200°C the
film behaves like a simple CuS film; the sheet resistance is around 100
<>W and the crystallized phase in the
composite is CuS (Covellite). When the temperature is equal or higher than
250°C, atomic diffusion at the
CuS-Bi2S3 interface is
promoted, leading to the formation of the ternary compound
Cu3BiS3 (Wittichenite) in
the composite film. The formation of the compound depends on the
temperature, relative abundance of the
Bi2S3 and CuS components
in the CuS-Bi2S3 pigment
as well as on the annealing atmosphere.
Order No.:
JA809-015 © 1998 MRS
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