2. *Chemistry Department, Faculty of Science and Arts, Baljarashi, Al-Baha University, P.O.
Box1988 Al-Baha, Saudi Arabia.
*Corresponding author E-mail address: loutfy.madkour@yahoo.com
Recevied September 8, 2013
Abstract
The polymetal (Zn, Pb, Fe, Ca, Mg, Cd, Ba, Ni, Ti, and SiO2) complex Umm-Gheig
carbonate ore is subjected to sintering treatment at 573, 773, 973 and 1273 K respectively
for four hours. Chemical, spectral, X-ray and differential thermal analyses are applied for
the native ore as well as for the samples preheated and sintered. The I-V characteristics,
bulk density (Db), percent shrinkage (%S), activation energy (Ea) and energy gap (Eg)
are established for the sintered ore. The electrical conductivity (), thermal conductivity (K)
and thermoelectric power coefficient () have been investigated as a function of applied
temperature for the sintered ore materials. The electrical and thermal measurements
show that the sintered ore has semiconductivity behaviour with temperature. The
electrical conduction is mainly achieved by electrons or n-type. As the sintering
temperature (Ts) increases the conduction of the ore is also increased owning to the
recombination process takes place between the electrons and holes. Electrons hopping
between Fe2+ and Fe3+ are the main charge carriers. The formation of Fe3O4 at high
sintering temperature acts as an active mineralizer, thus inducing an increased degree of
crystallinity and the more ordered crystal structure is produced.
Keywords: Polymetal carbonate ore; sintering treatment; semiconductivity behaviour.
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Loutfy H. Madkour
![*Chemistry Department, Faculty of Science and Arts, Baljarashi, Al-Baha University, P.O.
Box1988 Al-Baha, Saudi Arabia.
*Corresponding author E-mail address: loutfy.madkour@yahoo.com
Recevied September 8, 2013
Abstract
The polymetal (Zn, Pb, Fe, Ca, Mg, Cd, Ba, Ni, Ti, and SiO2) complex Umm-Gheig
carbonate ore is subjected to sintering treatment at 573, 773, 973 and 1273 K respectively
for four hours. Chemical, spectral, X-ray and differential thermal analyses are applied for
the native ore as well as for the samples preheated and sintered. The I-V characteristics,
bulk density (Db), percent shrinkage (%S), activation energy (Ea) and energy gap (Eg)
are established for the sintered ore. The electrical conductivity (), thermal conductivity (K)
and thermoelectric power coefficient () have been investigated as a function of applied
temperature for the sintered ore materials. The electrical and thermal measurements
show that the sintered ore has semiconductivity behaviour with temperature. The
electrical conduction is mainly achieved by electrons or n-type. As the sintering
temperature (Ts) increases the conduction of the ore is also increased owning to the
recombination process takes place between the electrons and holes. Electrons hopping
between Fe2+ and Fe3+ are the main charge carriers. The formation of Fe3O4 at high
sintering temperature acts as an active mineralizer, thus inducing an increased degree of
crystallinity and the more ordered crystal structure is produced.
Keywords: Polymetal carbonate ore; sintering treatment; semiconductivity behaviour.
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Viewing Options
[View Full Article - HTML]
[View Full Article - PDF]
[Download Full Article - PDF]
Search Other Articles by author(s)
on Google Scholar
Loutfy H. Madkour](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)