Catalytic decomposition of N2O on La2Cu0.5M0.5O4 (M=Co, Ni, Cu and Zn)

Kameswari, U.; Christopher, J.; Swamy, C. S.

doi:10.1007/bf02068380

Cited by 6 publications

(3 citation statements)

References 11 publications

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“…In the present La 2 Mn 1– x Cu x CoO 6 (0 ≤ x ≤ 0.4) series, the substitution of smaller Mn 4+ (0.53 Å) by larger-sized Cu 2+ (0.730 Å) as well as the possible mixed cation occupancy can be attributed to the genesis of structural phase transition from monoclinic to rhombohedral. La 2 MnCuO 6 was reported to crystallize in cubic symmetry …”

Section: Resultsmentioning

confidence: 99%

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Observation of Predominant Long-Range Ordering by Overcoming the Magnetic Frustration in Cu-Doped La₂MnCoO₆

et al. 2021

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We have investigated the effect of copper substitution on the structure, cation valence, and magnetic properties of the double p erovskit e La 2 MnCoO 6 . La 2 Mn 1−x Cu x CoO 6 (0 ≤ x ≤ 0.4) were synthesized by the sol− gel techniques and characterized by PXRD, FE-SEM, EDX, XPS, and both the dc-and ac-magnetization. There is a structural transition for copper substitution, where the monoclinic structure of the parent La 2 MnCoO 6 transformed to the rhombohedral structure. The ionic size difference between Mn 4+ (0.53 Å) and Cu 2+ (0.73 Å) may be ascribed to be the driving force behind the structural transition with an increase in Cu doping. EDX analysis confirms the nominal cationic compositions and chemical homogeneity of the samples. The copper substitution has a large impact on the valency of both the Mn and Co cations by following the charge neutrality condition: 3+ , where x is the doping concentration. There is also the Co 2+ + Mn 4+ = Co 3+ + Mn 3+ interaction. The presence of multivalent cations is evidenced from the XPS analysis. This largely influences the cationic ordering as well as the magnetic interactions. The monoclinic structure of the x = 0 and 0.1 samples show long-range ferromagnetic ordering. This is associated with the Mn 4+ OCo 2+ ferromagnetic superexchange interaction in the ordered state of Mn 4+ and Co 2+ . For small Cu doping (x = 0.1), this interaction is marginally disturbed. However, in the rhombohedral phase for x ≥ 0.2, the ferromagnetic interaction is largely suppressed with the evolution of competing antiferromagnetic interactions between the multivalent cations. Most importantly, in the panorama of multivalent mixed cations with randomness and competing exchange interactions, which are the fundamental ingredients of magnetic frustration, the antisite-disordered induced magnetic frustration for x = 0 is practically suppressed for x ≥ 0.2. The antiferromagnetic ordering over magnetic frustration can be attributed to the local lattice distortion induced by Jahn−Teller-active Cu 2+ and Mn 3+ and intermediate-spin-state Co 3+ ions.

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Section: Resultsmentioning

confidence: 99%

“…La 2 MnCuO 6 was reported to crystallize in cubic symmetry. 42 The FE-SEM analysis was carried for La 2 Mn 1−x Cu x CoO 6 (0 ≤ x ≤ 0.4) samples to determine the surface morphology and grain sizes. Figure 2 shows the FE-SEM images for all the samples.…”

Section: ■ Experimental Detailsmentioning

confidence: 99%

Observation of Predominant Long-Range Ordering by Overcoming the Magnetic Frustration in Cu-Doped La₂MnCoO₆

et al. 2021

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“…There has been particular interest in A-and B-site substituted manganites with the general formula La 1 -x Mn 1 -y O 3 ± δ (where M' is an alkaline-earth metal, and M" is a 3 d transition metal other than Mn), which have been studied most extensively in recent years. Many such manganites have already moved toward the manufacturing stage as materials for fuel cell electrodes [1], magnetoresistors [2], catalysts [3,4], and other applications. A serious impediment to the optimization of the engineering performance of known manganite materials and the search for new phases for advanced applications is the lack of detailed phase-diagram data for Ln-M'-Mn-M"-O systems.…”

Section: Introductionmentioning

confidence: 99%

Phase Equilibria and Crystal Structures of Mixed Oxides in the La-Mn-Ni-O System

Demina¹,

Черепанов²,

Петров³

et al. 2005

Inorg Mater

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The phase equilibria and crystal structures of mixed oxides in the ternary system La 2 O 3 -Mn 3 O 4 -NiO are studied at 1100 ° C in air. The projection of the La-Mn-Ni-O phase diagram at 1100 ° C and = 0.21 × 10 5 Pa onto the metal-composition triangle is found to comprise 12 phase fields. The lattice parameters of La 2 NiO 4 (sp. gr. I 4/ mmm ), La 3 Ni 2 O 7 (sp. gr. Cmcm ), La 4 Ni 3 O 10 (sp. gr. Cmca ), and La 1 + x Mn 1 -x -y Ni y O 3 solid solutions (sp. gr. Pnma , -0.04 ≤ x ≤ 0.05, 0 ≤ y ≤ 0.4) are determined. The composition stability limits of La 4 Ni 3 -y Mn y O 10 solid solutions are 0 < y ≤ 0.05. With increasing Ni concentration in La 1 + x Mn 1 -x -y Ni y O 3 , the metal nonstoichiometry decreases from -0.04 ≤ x ≤ 0.05 at y = 0 to x = 0 at y = 0.4. p O 2

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Oxidation kinetics of YBa2Cu3O7-γ thin films in different oxidizing ambients

Gupta

1993

Applied Surface Science

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Catalytic decomposition of N2O on La2Cu0.5M0.5O4 (M=Co, Ni, Cu and Zn)

Cited by 6 publications

References 11 publications

Observation of Predominant Long-Range Ordering by Overcoming the Magnetic Frustration in Cu-Doped La₂MnCoO₆

Observation of Predominant Long-Range Ordering by Overcoming the Magnetic Frustration in Cu-Doped La₂MnCoO₆

Phase Equilibria and Crystal Structures of Mixed Oxides in the La-Mn-Ni-O System

Oxidation kinetics of YBa2Cu3O7-γ thin films in different oxidizing ambients

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Catalytic decomposition of N2O on La2Cu0.5M0.5O4 (M=Co, Ni, Cu and Zn)

Cited by 6 publications

References 11 publications

Observation of Predominant Long-Range Ordering by Overcoming the Magnetic Frustration in Cu-Doped La2MnCoO6

Observation of Predominant Long-Range Ordering by Overcoming the Magnetic Frustration in Cu-Doped La2MnCoO6

Phase Equilibria and Crystal Structures of Mixed Oxides in the La-Mn-Ni-O System

Oxidation kinetics of YBa2Cu3O7-γ thin films in different oxidizing ambients

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Observation of Predominant Long-Range Ordering by Overcoming the Magnetic Frustration in Cu-Doped La₂MnCoO₆

Observation of Predominant Long-Range Ordering by Overcoming the Magnetic Frustration in Cu-Doped La₂MnCoO₆