LaCoO powders

Predoana et al. [119] studied the synthesis of the LaCoOs powders by the aqueous sol-gel method and established the correlation between their structure and properties and their sintering behavior to obtain fully densified ceramics with a perovskite structure. 

The best results have been obtained using LaCoOs powders prepared from nitrates, sintered at 1100 °C. 

In a typical preparation of LaCoOs powder, an equimolar mixture of the appropriate oxalates was decomposed by slow heating to 600°C. The resultant material was pressed into pellets and fired at 1000 to 1200 C for two days. Repeated grinding and firing was necessary to eliminate the unreacted material (Raccah and Goodenough, 1967). 

Li et al. developed a solid-state reaction process to synthesize perov-skite-type LaCoOs NCs with grain diameters of 15 0 run (Li et al., 2002). In the first step of the preparation, 5 run composite hydroxide NPs were s)mthesized by grinding metal nitrates liquid paste and mixing with KOH. Then the composite powders were calcined at 800 °C, yielding a single-phase oxide. Tien-Thao et al. prepared LaCo Cui J.O3 x < 0.3) by mechano-synthesis (Tien-Thao et al., 2008). The sample has various distinct Co " " ions in the perovskite lattice, which are more reducible. The reduced catalyst surface comprising cobalt and copper atoms is very selective for the hydrogenation of CO. 

Meot-Meyer et al. (1985a) reported the crystal structure of LaCoo.geGei (CeNiSi2 type, a = 0.4309, 1.688, c = 0.4238). The sample was prepared by powder metallurgical... 

Predoana, L., Malic, B., Cri an, D., Dragan, N., Anastasescu, M., Calderon-Moreno, J., Scurtu, R., and Zaharescu, M. (2012) LaCoOs ceramics obtained from reactive powders. Ceram. Int, 38, 5433-5443. 

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