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IJC-A Vol.51A(12) [December 2012] >


Title: Accelerated polymorphous transformations of alumina induced by copper ions impede spinel formation
Authors: Kiss, E
Ratković, S
Vujičić, Dj
Boskovic, G
Keywords: Alumina
Polymorphous transformations
Spinels
Sintering
Copper
Magnesium
Zinc
Issue Date: Dec-2012
Publisher: NISCAIR-CSIR, India
Abstract: Slower copper spinel formation on alumina type supports relative to zinc and magnesium spinel formation has been investigated. Spinel formation occurs at high temperatures and is usually accompanied by polymorphous transformations of alumina support and sintering. In samples containing zinc and magnesium ions, decelerated polymorphous transformations of alumina occur relative to the transformation of pure aluminum sample. The impeded phase transformation of alumina coincides with decreased degree of sintering. In contrast, copper ions accelerate polymorphous transformations of alumina, and consequently the corresponding copper-alumina spinel formation is slower. Accelerated sintering may be explained by accelerated phase transformation of alumina, which itself is caused by copper ions slowing down spinel formation.
Page(s): 1669-1676
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-0975(Online); 0376-4710(Print)
Source:IJC-A Vol.51A(12) [December 2012]

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