Thermal Behavior in Air and Reactivity in Acid Medium of Cobalt Manganese Spinels MnxCo3-xO4 (1 .ltoreq. x .ltoreq. 3) Synthesized at Low Temperature

Vidales, J. L. Martı́n de; Vila, E.; Rojas, R.M.; García-Martínez, O.

doi:10.1021/cm00057a022

Cited by 46 publications

(40 citation statements)

References 2 publications

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“…This XRD pattern is well coincident with the JCPDS card #16-0427 [20]. It was also found that it is not agreement with JCPDS card #44-0145 [21] indicating the XRD pattern of imperfectly sintered LiCoO 2 powder. Therefore, it is concluded that LiCoO 2 powders synthesized in this work were well sintered.…”

Section: Electrochemical Characteristicssupporting

confidence: 51%

Optimization of the synthesis conditions of LiCoO2 for lithium secondary battery by ultrasonic spray pyrolysis process

Choi

Kim²,

Yang

2006

Journal of Materials Processing Technology

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Section: Electrochemical Characteristicssupporting

confidence: 51%

Optimization of the synthesis conditions of LiCoO2 for lithium secondary battery by ultrasonic spray pyrolysis process

Choi

Kim²,

Yang

2006

Journal of Materials Processing Technology

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“…A for JCPDS 23-1237) but comparable to values reported in literature for analogue compounds. 5 A slight cell shrinking could be accounted to a partial oxidation of Mn 3+ ions to Mn 4+ ions in tetragonal sites 5 eventually occurring during the HEBM.…”

Section: Resultsmentioning

confidence: 99%

“…3,4 Relative ratio of the different metal ions determines the lattice parameters in agreement with the Vegard's law. 5 Physical properties like electrical conductivity are highly affected by the structural properties and thus by the stoichiometry. Electrical conductivity, being associated with a thermally activated hopping mechanism between Mn 3+ / Mn 4+ and Co 2+ /Co 3+ ions on octahedral sites of the spinel crystal structure, 6 different tailoring of synthesis condition should therefore produce materials with different properties.…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical Processing of Mn and Co Oxides: An Alternative Way to Synthesize Mixed Spinels for Protective Coating

et al. 2015

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High‐Energy Ball Milling (HEBM) is proposed as a cost effective and environmental friendly technique to produce Co‐ and Mn‐ based oxides suitable for application as protective coating. Mixtures of manganese and cobalt oxides in different molar ratio (Co:Mn = 1:1 and Co:Mn = 2:1) were subjected to mechanochemical treatment up to 100 h and morpho‐structural evolution was evaluated. XRD analysis results show that the HEBM treatment promotes the solid‐state reaction of the starting compounds, with the formation of different crystalline phases when compared to high‐temperature solid‐state synthesis. SEM observations and N2 adsorption measurements suggest that all processed powders are composed by aggregates of nanometric particles. While long milling time is required to complete the reaction, 10 hours are enough to activate the powders to obtain the desired phases after a mild thermal treatment, as evidenced by in situ thermal XRD analysis. Electrical conductivity measures performed with the Van der Pauw method on sintered pellets evidence a significant difference between the two compositions, related to the dual‐phase nature of Co:Mn = 1:1 material at intermediate temperatures (i.e., T < 700°C), Co:Mn = 2:1 sample showing higher conductivity values in the whole tested range (500°C–800°C).

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“…A method to produce higher surface area metal oxides involves the decomposition of precursors and subsequent heat treatment at low temperatures. Several precursors have been used for the preparation of the mixed metal spinel: acetates [10], carbonates [4,11], citrates [4], hydroxycarbonates [12] and several more complex compounds [13][14][15][16][17][18][19][20] and gels [21,22]. Decomposition and heat treatment are usually carried out in oxygen or air at temperatures below 873 K, however the heat treatment can last from 1 h to a few days.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of (Co,Mn)(Co,Mn)2O4/MgO catalysts

Muneam

Hadi²,

Kareem³

et al. 2016

Int J Ind Chem

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A (Co,Mn)(Co,Mn) 2 O 4 /MgO catalyst was prepared by simple co-precipitation from an aqueous solution of the mixed metal salts using sodium carbonate. The calcination of the precipitate was characterized by TGA and XRD showing the generation of (Co,Mn)(Co,Mn) 2 O 4 /MgO by 773 K. The catalyst had a surface area of 45 m 2 g -1 in the fully calcined state (873 K) and was characterized by XRD and TGA. Characterization by TPR of the catalyst calcined at different temperatures revealed an annealing process that lowered the surface energy of the catalyst thereby inhibiting reduction. The calcined catalyst was active for the dehydrogenation of isopropanol to acetone and propene with the peak reaction temperature *428 K and a second reaction zone around 613 K related to strongly bound alcohol. Lattice oxygen was reactive from 463 K converting adsorbed alcohol into carbon dioxide.

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Thermal Behavior in Air and Reactivity in Acid Medium of Cobalt Manganese Spinels MnxCo3-xO4 (1 .ltoreq. x .ltoreq. 3) Synthesized at Low Temperature

Cited by 46 publications

References 2 publications

Optimization of the synthesis conditions of LiCoO2 for lithium secondary battery by ultrasonic spray pyrolysis process

Optimization of the synthesis conditions of LiCoO2 for lithium secondary battery by ultrasonic spray pyrolysis process

Mechanochemical Processing of Mn and Co Oxides: An Alternative Way to Synthesize Mixed Spinels for Protective Coating

Preparation and characterization of (Co,Mn)(Co,Mn)2O4/MgO catalysts

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