Preparation, microstructure and electrical property of (Co plus CoO) mixture by thermal decomposition of [Co(NH3)(6)](C2O4)(2)center dot 4H(2)O

Authors
Nakayama, S Sakamoto, M
Citation
S. Nakayama et M. Sakamoto, Preparation, microstructure and electrical property of (Co plus CoO) mixture by thermal decomposition of [Co(NH3)(6)](C2O4)(2)center dot 4H(2)O, CERAM INT, 26(2), 2000, pp. 119-122
Citations number
6
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
CERAMICS INTERNATIONAL
ISSN journal
02728842 → ACNP
Volume
26
Issue
2
Year of publication
2000
Pages
119 - 122
Database
ISI
SICI code
0272-8842(2000)26:2<119:PMAEPO>2.0.ZU;2-R
Abstract
The thermal decomposition of hexaamminecobalt(III) oxalate tetrahydrate, [C o(NH3)(6)](C2O4)(2). 4H(2)O, was investigated in a helium stream. The decom position occurs in three steps. TG, IR and XRD analyses revealed that the a nhydrate, the cobalt (II) oxalate, CoC2O4, and the (Co + CoO) mixture are f ormed in the range of 165 to 175 degrees C, 250 to 270 degrees C and above 330 degrees C, respectively. SEM photographs and XRD results of the final ( Co + CoO) mixture showed that the Co-component is rich near the upper part and the CoO-component is rich in the lower part. Specific surface areas and electrical resistivities of decomposition products are also reported. (C) 2000 Elsevier Science Ltd and Techna S.r.l. All rights reserved.