Du choix du précurseur pour la synthèse de poudres d’oxydes La1–xSrxMnO3

Guillemet‐Fritsch, Sophie; Alphonse, Pierre; Calmet, Christophe; Coradin, Hervé; Tailhades, Philippe; Rousset, A.

doi:10.1016/j.crci.2004.10.026

Cited by 4 publications

(2 citation statements)

References 28 publications

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“…Although the methods for the preparation of LaMnO 3 in reverse micelles were already reported in the literature [14][15][16], the only synthesis of LaSrMnO 3 or of any mixed lanthanum manganite within reverse micelles, published elsewhere is our previous work [17] concerning co-precipitation preparation of La 0.67 Sr 0.33 MnO 3+d in CTAB/1-butanol/1-hexanol/water microemulsion by using tetramethylammonium hydroxide as an alkali precipitating agent. Synthesis of different perovskite mixed metal oxides by using oxalate precursors (including La 1Àx Sr x MnO 3 ) [18] has been noticed elsewhere, and is largely excepted as a method which produces uniform cation distribution [19,20].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of lanthanum–strontium manganites by oxalate-precursor co-precipitation methods in solution and in reverse micellar microemulsion

Uskoković

Drofenik

2006

Journal of Magnetism and Magnetic Materials

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Nanostructured lanthanum-strontium manganites were synthesized using two different co-precipitation approaches, one in bulk solution, and the other in reverse micelles of CTAB/1-hexanol/water microemulsion. In both cases, precursor cations were precipitated by using oxalic acid. The properties of the materials synthesized by using these two methods were compared in order to reveal potential advantages of the microemulsion-assisted approach. The influence of the annealing conditions on the properties of synthesized manganites was investigated by using X-ray diffraction, transmission electron microscopy, differential thermal analysis, thermogravimetric analysis and magnetic measurements. r

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Section: Introductionmentioning

confidence: 99%

Synthesis of lanthanum–strontium manganites by oxalate-precursor co-precipitation methods in solution and in reverse micellar microemulsion

Uskoković

Drofenik

2006

Journal of Magnetism and Magnetic Materials

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“…In order to overcome the disadvantages of low surface area and limited control of the micro-structure inherent in the high temperature process, sol-gel method [8], solution combustion synthesis [9], or co-precipitation [10] of metal ions by precipitating agents have been used.…”

Section: Introductionmentioning

confidence: 99%

A study of the Influence of the Synthesis Conditions upon the Catalytic Properties of LaMnO3.15 in Methane Combustion in the Absence and Presence of H2S

2007

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We report here on the activity and stability of LaMnO 3.15 for the methane combustion, in the absence and presence of H 2 S, in a temperature interval of 250-750°C. Two powders with different specific surface area were prepared by coprecipitation method using ammonia. Precursors calcined at high temperature, in air, for 10 h have led to LaMn-C solid with S BET = 11 m 2 /g, while those previously aged in solution (hydrothermal treatment at 200°C under 20 atm. for 24 h) then calcined at high temperature led to LaMn-HydC with S BET = 31 m 2 /g. Temperature programmed reduction (TPR) profile of both samples showed two main peaks; surface and weakly bound oxygen named a-oxygen species and lattice oxygen b-oxygen species. While for LaMn-C the maximum reduction temperature peak corresponding to a-oxygen species was found to be ca. 600°C, for LaMn-HydC samples this peak was shifted to lower temperature ca. 430°C. Indeed, LaMn-HydC samples showed higher depletion of surface and weakly bound oxygen species compared to LaMn-C. The superior catalytic performance of LaMn-HydC in methane combustion was attributed to its high BET surface area and to both the high amount of a-oxygen species and their mobility. In the presence of 100 ppm H 2 S in the feed this catalyst showed a higher propensity to poisoning by sulphur compounds than LaMn-C. This was attributed to the rapid formation of stable sulphate/sulphite species, the decomposition of which occurs above 800°C.

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Effect of Al2O3 addition on the microstructure and electrical properties of LaMnO3-based NTC thermistors

Zhang

Liu

Zhao

et al. 2017

J Mater Sci: Mater Electron

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Du choix du précurseur pour la synthèse de poudres d’oxydes La1–xSrxMnO3

Abstract: Centre interuniversitaire de recherche et d'ingénierie des matériaux (CIRIMAT)/Laboratoire de chimie des matériaux inorganiques et énergétiques, université Paul-Sabatier, bât. 2R1,

Cited by 4 publications

References 28 publications

Synthesis of lanthanum–strontium manganites by oxalate-precursor co-precipitation methods in solution and in reverse micellar microemulsion

Synthesis of lanthanum–strontium manganites by oxalate-precursor co-precipitation methods in solution and in reverse micellar microemulsion

A study of the Influence of the Synthesis Conditions upon the Catalytic Properties of LaMnO3.15 in Methane Combustion in the Absence and Presence of H2S

Effect of Al2O3 addition on the microstructure and electrical properties of LaMnO3-based NTC thermistors

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