Effect of the Mn3+ ion on electrical and magnetic properties of orthorhombic perovskite-type Ca(Mn1−xTix)O3−δ

Nakade, Katsuyuki; Hirota, Ken; Kato, Masaki; Taguchi, Hideki

doi:10.1016/j.materresbull.2006.09.013

Cited by 18 publications

(14 citation statements)

References 24 publications

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“…The Curie constant obtained was 0.8991 emu K/mol and the effective moment m eff ¼2.68 m B -Bohr magneton is obtained by means of equation: C ¼Nm eff 2 / 3k B where N is the number density of magnetic ions per unit gram, k B is the Boltzmann's constant [15,16]. The calculated effective moment per Mn in this study is close to 2.58 m B -Bohr magneton as reported byNakade et al[17] But smaller than that of Sr(…”

supporting

confidence: 85%

Structural and magnetic properties of single perovskite Ca(Ti1/2Mn1/2)O3

Shi

Hao

2011

Journal of Magnetism and Magnetic Materials

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supporting

confidence: 85%

Structural and magnetic properties of single perovskite Ca(Ti1/2Mn1/2)O3

Shi

Hao

2011

Journal of Magnetism and Magnetic Materials

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“…From characterization, it is clear that Mg is not incorporated into the perovskite structure, and this is likely due to the low ionic radii of Mg [49]. This is unlike the cations Fe and Ti, which can substitute Mn in the perovskite structure [50,51]. Still, in a prior investigation, Hallberg et al [35] clearly showed that the calcium manganite with Mg addition had better behavior with respect to CLOU than material doped with Fe and Ti.…”

Section: Discussionmentioning

confidence: 98%

Examination of Perovskite Structure CaMnO_3-δwith MgO Addition as Oxygen Carrier for Chemical Looping with Oxygen Uncoupling Using Methane and Syngas

Jing

Mattisson

Leion

et al. 2013

International Journal of Chemical Engineering

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Perovskite structure oxygen carriers with the general formula CaMn x Mg 1-x O 3-were spray-dried and examined in a batch fluidized bed reactor. The CLOU behavior, reactivity towards methane, and syngas were investigated at temperature 900 ∘ C to 1050 ∘ C. All particles showed CLOU behavior at these temperatures. For experiments with methane, a bed mass corresponding to 57 kg/MW was used in the reactor, and the average CH 4 to CO 2 conversion was above 97% for most materials. Full syngas conversion was achieved for all materials utilizing a bed mass corresponding to 178 kg/MW. SEM/EDX and XRD confirmed the presence of MgO in the fresh and used samples, indicating that the Mg cation is not incorporated into the perovskite structure and the active compound is likely pure CaMnO 3-. The very high reactivity with fuel gases, comparable to that of baseline oxygen carriers of NiO, makes these perovskite particles highly interesting for commercial CLC application. Contrary to NiO, oxygen carriers based on CaMnO 3-have no thermodynamic limitations for methane oxidation to CO 2 and H 2 O, not to mention that the materials are environmentally friendly and can utilize much cheaper raw materials for production. The physical properties, crystalline phases, and morphology information were also determined in this work.

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“…As prepared, the sample comprises a major phase of CaMn [35]. The minor perovskite phase exhibits unit cell dimensions close to those reported for CaTiO 3 [36] and so is presumed to be a Ti-rich member of the same solid solution.…”

Section: In Situ Xrdmentioning

confidence: 67%

Fabrication process parameters significantly affect the perovskite oxygen carriers materials (OCM) performance in chemical looping with oxygen uncoupling (CLOU)

Larring

Pishahang

Tolchard

et al. 2019

J Therm Anal Calorim

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The CLOU performance of the CaTi x Mn 0.9-x Mg 0.1 O 3 (CMTM) perovskite-type system was investigated, comparing materials produced at laboratory scale with those made at industrial ton scale. The CLOU and conversion performances were studied by a micropacked bed reactor, and crystalline phase structure and homogeneity and bulk density identified as the most important parameters affecting the performance of the OCM. Bulk density is correlated with the sintering temperature, atmosphere and time at sintering temperature, while phase homogeneity is a function of the raw materials chosen, agglomeration method and sintering procedure. Specific challenges are identified in the control of slurry homogeneity and sintering conditions in upscaled production. The degree of sintering affects the chemo-mechanical properties of the material (crushing strength and attrition index), physical properties (specific surface area), and more importantly the crystalline phases formed and their homogeneity: the quantity of ''active'' crystalline phases present directly determines the thermochemical conversion properties (i.e., CLOU capacity and methane conversion), oxygen transfer capacity and kinetics.

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Effect of the Mn3+ ion on electrical and magnetic properties of orthorhombic perovskite-type Ca(Mn1−xTix)O3−δ

Cited by 18 publications

References 24 publications

Structural and magnetic properties of single perovskite Ca(Ti1/2Mn1/2)O3

Structural and magnetic properties of single perovskite Ca(Ti1/2Mn1/2)O3

Examination of Perovskite Structure CaMnO_3-δwith MgO Addition as Oxygen Carrier for Chemical Looping with Oxygen Uncoupling Using Methane and Syngas

Fabrication process parameters significantly affect the perovskite oxygen carriers materials (OCM) performance in chemical looping with oxygen uncoupling (CLOU)

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Effect of the Mn3+ ion on electrical and magnetic properties of orthorhombic perovskite-type Ca(Mn1−xTix)O3−δ

Cited by 18 publications

References 24 publications

Structural and magnetic properties of single perovskite Ca(Ti1/2Mn1/2)O3

Structural and magnetic properties of single perovskite Ca(Ti1/2Mn1/2)O3

Examination of Perovskite Structure CaMnO3-δwith MgO Addition as Oxygen Carrier for Chemical Looping with Oxygen Uncoupling Using Methane and Syngas

Fabrication process parameters significantly affect the perovskite oxygen carriers materials (OCM) performance in chemical looping with oxygen uncoupling (CLOU)

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Product

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Examination of Perovskite Structure CaMnO_3-δwith MgO Addition as Oxygen Carrier for Chemical Looping with Oxygen Uncoupling Using Methane and Syngas