Evolution of Mn and Co oxidation state on TbMn1–xCoxO3 compounds

Cuartero, Vera; Blasco, Javier; Garcı́a, J.; Lafuerza, Sara; Subı́as, G.

doi:10.1088/1742-6596/430/1/012102

Cited by 7 publications

(15 citation statements)

References 7 publications

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“…The observed edge energies ( E 0 ) for different samples are given in Table . The observed XANES spectra and edge energies are similar those of LnCo 0.5 Mn 0.5 O 3 (Ln = La, Tb) reported in the literature. , It is observed that for all the annealed samples the Co K-edges appeared between those of CoO and CoF 3 and similarly the Mn K-edges appeared between those of Mn 2 O 3 and MnO 2 . This suggests that the oxidation state of Co is between 2 and 3 while that of Mn is between 3 and 4.…”

Section: Results and Discussionsupporting

confidence: 87%

Effect of Annealing Environment on Low-Temperature Magnetic and Dielectric Properties of EuCo_0.5Mn_0.5O₃

Katari¹,

Achary²,

Deshpande³

et al. 2014

J. Phys. Chem. C

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We report the effect of annealing atmosphere on structure and magnetic and dielectric properties of double perovskite-type EuCo0.5Mn0.5O3 (ECMO). Polycrystalline samples prepared by high-temperature reaction were subjected to annealing in different oxygen partial pressures and investigated by powder X-ray diffraction, magnetometry, and ac impedance spectroscopy. While the samples annealed in air or oxygen environment were found to have cation-disordered orthorhombic structure (Pnma), the samples annealed in inert atmosphere have Eu3+ deficient perovskite-type structure. The temperature- and field-dependent magnetizations indicate the ferromagnetic transition around 130 K. The differences in field-cooled and zero-field-cooled magnetization and significant effect of magnetic field on magnetic properties suggest metamagnetic behavior in ECMO. Randomly distributed clusters of ferromagnetically (FM) and antiferromagnetically (AFM) paired magnetic ions and their relative proportions are reflected in their magnetic properties. The weak nature of the antiferromagnetic interactions is reflected in the switching of AFM to FM state at appreciably lower field strength (∼300 Oe). Dielectric measurements indicate that the samples annealed in air or oxygen show large dielectric permittivity (≥2000) compared to that in inert atmosphere (∼400). The analyses of temperature- and frequency-dependent loss tangent and modulus data revealed two different types of relaxations which possibly originate from two polaronic conduction processes.

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Section: Results and Discussionsupporting

confidence: 87%

Effect of Annealing Environment on Low-Temperature Magnetic and Dielectric Properties of EuCo_0.5Mn_0.5O₃

Katari¹,

Achary²,

Deshpande³

et al. 2014

J. Phys. Chem. C

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“…In detail, taking 3d transition metal as an example. The electrons transition from 3p to 1s contributes to K𝛽 1,3 lines as core-to-core XES (ctc-XES), [38,88] which is sensitive to the oxidation state due to the shielding effect of valence electron. Moreover, the downshift in the electronic state from 3d to 1s leads to weak K𝛽 2,5 lines as valence-to-core XES (vtc-XES), [37,89] which provides a fine configuration of valence electrons.…”

Section: The Identification Of the Active Phase Of Catalystsmentioning

confidence: 99%

“…[24][25][26] Synchrotron radiation light sources provide the advantages of a wide spectrum, high brightness, high collimation, and high coherence. [27][28][29][30] Accordingly, they have overwhelmed the traditional methods in terms of crystal structure/phase (synchrotron radiation X-ray diffraction (SRXRD)), [31,32] local geometry structure (X-ray absorption fine structure, XAFS), [33][34][35] electronic structure (soft X-ray absorption spectroscopy; X-ray emission spectroscopy (XES); resonant inelastic X-ray scattering (RIXS)), [36][37][38][39] surface composition (synchrotron radiation photoelectron spectroscopy (SRPES); ambient-pressure X-ray photoelectron spectroscopy (APXPS)), [40,41] chemisorbed species, active free radicals and reactive intermediates (synchrotron radiation infrared spectroscopy (SR-IR); synchrotron radiation photoionization mass spectrometry), [42][43][44][45] spin and orbital magnetic moment (X-ray magnetic circular dichroism), [46,47] imaging involving elements, chemistry, and strain distribution (the Bragg coherent diffractive imaging (BCDI); scanning transmission X-ray microscopy (STXM)), and so on. [48][49][50] In addition, such relevant characterization techniques based on the advanced light sources readily deliver opportunities to carry out some measurements under extreme conditions (high pressure, high temperature, low temperature and radiation, etc.)…”

Section: Introductionmentioning

confidence: 99%

Visualizing Catalytic Dynamics Processes via Synchrotron Radiation Multitechniques

Cao

Liu

et al. 2023

Advanced Materials

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The importance of catalysts today as workhorses in most modern industrial fields cannot be downplayed. As a result, rational design and engineering of targeted catalysts have emerged as key objectives and are dependent on in‐depth understanding of complex catalytic dynamics. Synchrotron radiation (SR) light sources with rich advanced experimental methods are being recognized as a comprehensive characterization platform, which can draw a full picture on such multiparameter‐involved catalysis under actual working conditions. Herein, the recent progress of catalytic dynamics process studied by the means of various SR techniques is summarized. In particular, SR‐based spectroscopic, scattering, and imaging investigations on true catalysts are first introduced with the potential of in situ and operando characterizations. Apparently, the limitations from single SR technique naturally prompt a simple combination of SR techniques to better understand the whole catalysis process. Moreover, the discrepancies among various online testing facilities and batches of samples, along with random/systematic errors introduced by traditional intermittent/asynchronous measurement make it imperative to develop more prolific systems, complementary of multiple SR techniques for deep probing of dynamic catalytic processes. It is believed that the booming new light sources can further enrich the current multiple SR techniques, and thus may realize the true visualization on future catalytic dynamic processes.

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“…The position of the main-edge peak, the absorption edge energy, is sensitive to the overall oxidation state of the Mn cations and is commonly used to study changes in the oxidation state of Mn cations in manganese oxides. 6,7,[28][29][30][31] Feature B corresponds to a dipole-forbidden transition of a 1s electrons into unoccupied Mn 3d states hybridized with O 2p states. Features in the pre-edge region near the main-edge may also correspond to the transition of 1s electrons into neighbouring Mn 3d states 23 or low energy Mn 4p states.…”

Section: Xanesmentioning

confidence: 99%

“…Features in the pre-edge region near the main-edge may also correspond to the transition of 1s electrons into neighbouring Mn 3d states 23 or low energy Mn 4p states. 31 The intensity and energy position of the preedge peak is sensitive to a number of structural and electronic features including oxidation state, coordination environment, and crystal symmetry. 27,32 Fig Where not obvious the esds are smaller than the symbols.…”

Section: Xanesmentioning

confidence: 99%

Soft ferromagnetism in mixed valence Sr_1−xLa_xTi_0.5Mn_0.5O₃perovskites

et al. 2014

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The structural, magnetic and electrical properties of the mixed Ti-Mn oxides Sr(1-x)La(x)Ti(0.5)Mn(0.5)O3 (0 ≤ x ≤ 0.5) are reported. At room temperature the oxides have a cubic structure in space group Pm3m for x ≤ 0.25 and rhombohedral in R3c for 0.3 ≤ x ≤ 0.50. X-ray absorption spectroscopic measurements demonstrate the addition of La(3+) is compensated by the partial reduction of Mn(4+) to Mn(3+). Variable temperature neutron diffraction measurements show that cooling Sr(0.6)La(0.4)Ti(0.5)Mn(0.5)O3 results in a first order transition from rhombohedra to an orthorhombic structure in Imma. Complex magnetic behaviour is observed. The magnetic behaviour of the mixed valent (Mn(3+/4+)) examples is dominated by ferromagnetic interactions, although cation disorder frustrates long range magnetic ordering.

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Evolution of Mn and Co oxidation state on TbMn_1–xCo_xO₃ compounds

Cited by 7 publications

References 7 publications

Effect of Annealing Environment on Low-Temperature Magnetic and Dielectric Properties of EuCo_0.5Mn_0.5O₃

Effect of Annealing Environment on Low-Temperature Magnetic and Dielectric Properties of EuCo_0.5Mn_0.5O₃

Visualizing Catalytic Dynamics Processes via Synchrotron Radiation Multitechniques

Soft ferromagnetism in mixed valence Sr_1−xLa_xTi_0.5Mn_0.5O₃perovskites

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Evolution of Mn and Co oxidation state on TbMn1–xCoxO3 compounds

Cited by 7 publications

References 7 publications

Effect of Annealing Environment on Low-Temperature Magnetic and Dielectric Properties of EuCo0.5Mn0.5O3

Effect of Annealing Environment on Low-Temperature Magnetic and Dielectric Properties of EuCo0.5Mn0.5O3

Visualizing Catalytic Dynamics Processes via Synchrotron Radiation Multitechniques

Soft ferromagnetism in mixed valence Sr1−xLaxTi0.5Mn0.5O3perovskites

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Evolution of Mn and Co oxidation state on TbMn_1–xCo_xO₃ compounds

Effect of Annealing Environment on Low-Temperature Magnetic and Dielectric Properties of EuCo_0.5Mn_0.5O₃

Effect of Annealing Environment on Low-Temperature Magnetic and Dielectric Properties of EuCo_0.5Mn_0.5O₃

Soft ferromagnetism in mixed valence Sr_1−xLa_xTi_0.5Mn_0.5O₃perovskites