Electronic structure and chemical bonding in La1−xSrxMnO3perovskite ceramics

Thenmozhi, N.; Sasikumar, S.; Sonai, S; Ramachandran, K.

doi:10.1088/2053-1591/aa6abf

Cited by 15 publications

(3 citation statements)

References 40 publications

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“…The second band was observed at about 480 cm −1 and originated from O‐Mn‐O/Mn‐O‐Mn bending, while the third band at about 420 cm −1 originated from the Mn‐O‐Mn bonds bending 30–32 . For Sr‐concentrations x = .2 and .3, observed FTIR spectra were a straight line rising toward the wavenumber < 400 cm −1 , since the increasing Sr‐concentration contributes to the ionic nature of La‐O bonds in the LSMO samples 34 . Therefore, for x ≥ .2 Mn‐O stretching and bending modes did not exist due to the covalent bond disappearance.…”

Section: Resultsmentioning

confidence: 90%

“…[30][31][32] For Srconcentrations x = .2 and .3, observed FTIR spectra were a straight line rising toward the wavenumber < 400 cm −1 , since the increasing Sr-concentration contributes to the ionic nature of La-O bonds in the LSMO samples. 34 Therefore, for x ≥ .2 Mn-O stretching and bending modes did not exist due to the covalent bond disappearance.…”

Section: Lsmo Crystallizationmentioning

confidence: 95%

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Simultaneous oxidation of aromatic compounds using Sr‐doped lanthanum manganites as catalysts

Žužić

Car

Macan

et al. 2022

Int J Applied Ceramic Tech

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Strontium-doped lanthanum manganites, La 1-x Sr x MnO 3 (LSMO), are promising and affordable catalysts for oxidative degradation of volatile organic compounds. LSMO catalysts (x = 0, .1, .2, and .3) were prepared by the citrate-nitrate autocombustion (CNA) and coprecipitation synthesis. The phase composition was confirmed by X-ray diffraction and Rietveld refinement analysis, while the oxygen content was determined by Mohr's salt permanganate titration.Morphology and porosity of prepared catalysts was correlated to catalytic oxidation of benzene, toluene, ethylbenzene and o-xylene. It was observed that both synthesis methods yielded catalysts of similar average pore size diameter and specific surface area, but the pore size distribution differed: CNA-prepared catalysts had a multimodal pore size distribution, while the coprecipitated ones had a single maximum at 4 nm. Catalysts prepared by the CNA method have shown a higher catalytic activity in the temperature range 373-723 K, as the presence of Mn 3+ /Mn 4+ mixed valences increased their reducibility.

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Section: Resultsmentioning

confidence: 90%

Section: Lsmo Crystallizationmentioning

confidence: 95%

Simultaneous oxidation of aromatic compounds using Sr‐doped lanthanum manganites as catalysts

Žužić

Car

Macan

et al. 2022

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

show abstract

“…Naime, udjeli Sr veći od 0,2 dovode do jačanja ionskog karaktera veza La−O i slabljenja kovalentnog karaktera veze Mn−O, što rezultira nestankom vrpci s FTIR spektra. 15 Za usporedbu Moguće je da takav koprecipitacijski postupak sinteze nije učinkovit za udjele dopiranja veće od 0,3, 11,13 no u svakom slučaju treba voditi računa o utjecaju oblika uzorka (prah, tableta) na njegovu kristalizaciju i prema potrebi prilagoditi uvjete priprave i toplinske obrade. Na temelju rezultata dobivenih u ovom istraživanju proizlazi da visokodopirani LSMO materijali ne mogu biti pripremljeni u obliku guste keramike ili keramičkih membrana zbog rizika od izdvajanja dodatnih faza pod tlakom.…”

Section: Rezultati I Raspravaunclassified