XAFS characterization of La1−xSrxMnO3±δ catalysts prepared by Pechini’s method

Incorporation of Bulk Proton Carriers in Cubic Perovskite Manganite Driven by Interplays of Oxygen and Manganese Redox

“…The adsorption edges of LSM series locate between ones of two references, that is, LaMnO 3 and CaMnO 3 (6550.07 and 65552.82 eV, respectively; Figure a), confirming that the Mn valence state of LSM is between +3.20 and +3.99. Thus, the average Mn valence state of LSM series is determined by interpolating to the calibration line connecting LaMnO 3 (+3.20) and CaMnO 3 (+3.99; Figure S6), which results in the valence state equaling to +3.27, +3.20, and +3.20 for C-LSM91, C-LSM82, and C-LSM73, respectively (Figure c and Table ), which is in accordance with the reports elsewhere. , The small gap (0.06) in the Mn valence state determined by Mn K-edge and iodometry confirms that the chemical shifts of Mn K-edge can properly probe the valence state of Mn atoms for all LSM (Figure c).…”

“…Thus, the average Mn valence state of LSM series is determined by interpolating to the calibration line connecting LaMnO 3 (+3.20) and CaMnO 3 (+3.99; Figure S6), which results in the valence state equaling to +3.27, +3.20, and +3.20 for C-LSM91, C-LSM82, and C-LSM73, respectively (Figure 5c and Table 2), which is in accordance with the reports elsewhere. 55, 56 The small gap (0.06) in the Mn valence state determined by Mn K-edge and iodometry confirms that the chemical shifts of Mn K-edge can properly probe the valence state of Mn atoms for all LSM (Figure 5c). Oxygen stoichiometry (3 + δ) of dehydrated La 1−x Sr x MnO 3+δ is calculated from the average Mn valence state determined by Mn K-edge, assuming that the stoichiometry of metal cations is the same as in the raw materials, and the valences of Sr, La, and O are fixed at +2, +3, and −2, respectively (Figure 5d and Table 2).…”

Self-propagating high-temperature synthesis of Sr-doped LaMnO3 perovskite as oxidation catalyst

“…chemical syntheses, such as amorphous citrate process (Pechini method) and sol-gel method, etc., have been adopted in order to reduce the sintering temperature. However, they require expensive starting materials and complex procedures [4,5]. For these reasons, the conventional methods are not suited for the mass production of LSMx.…”

EXAFS Studies of Ruthenium Based Double Perovskite ALaMnRuO<sub>6</sub> (A = Ca, Sr, Ba)

“…For 50% substitution, such mixed system are classified as double perovskites with the formula AA′MM′O 6 or A 2 MM′O 6 as reported by Anderson et al (1993) in reference [7]. The lattice distortion and local structure plays an important role in the magnetoelectric transport properties of perovskite manganites, in particular its effect on the colossal magnetoresistive (CMR) properties [8][9][10].…”