Pure and doped lanthanum manganites obtained by combustion method

Effect of propellant on the combustion synthesized Sr-doped LaMnO3 powders

“…The specific surface areas, determined by BET method, of all calcined samples were lower than 10 m 2 /g, consistent with other values reported in the literature [11,16]. Fig.…”

“…1) show at least three decomposition steps: the first, at 200 8C, can be assigned to water loss and also to reaction between glycine and nitrate anions with formation of hydroxy-species [11]. The second and third decomposition steps, at 600 and 850 8C, can be associated as described previously for urea route.…”

The effect of citric acid to metal nitrates molar ratio on sol–gel combustion synthesis of nanocrystalline LaMnO3 powders

“…The band at 1465 cm −1 with a shoulder at 1370 cm −1 can be assigned to the C-O stretching of unidentified carbonates resulting from the decomposition of the citrates. A small band at 865 cm −1 , due to O-C-O bending in the carbonates, can also be observed [18]. The disappearance of the characteristic bands of the carboxylic group and NO 3 − ions in the IR spectra of as-burnt powder suggests that carboxylic group and NO 3 − ions take part in the reaction during combustion.…”

Study of mechanochemically prepared nanocrystalline La0.8Sr0.2MnO3

“…Cook Table 3 Comparison of crystallite size (c s ), crystal structure, lattice cell constants, Vickers hardness number (HV), sintered density, and deviation from oxygen stoichiometry (δ) of LSM prepared by varying the preparative parameters Sample c s (Å) Crystal structure Lattice cell constants HV [46]. In more recent past, various compositions of the Sr-doped LaMnO 3 have been prepared by combustion route [32,33,47], coprecipitation method [31], and sol-gel process [29,30]. Alternatively, Zhang et al [8] have prepared LSM with x= 0.3 by milling the oxide mixtures at 700 rpm for 3 h. The difference between the time required for the formation of LSM during the present study and that reported by Zhang et al [8] is due to lower revolutions per minute in the case of the former vis-à-vis the latter.…”