Modified self-propagating high-temperature synthesis of nanosized La0.7Ca0.3MnO3

Mraković, Ana; Blanuša, J.; Primc, Darinka; Perović, M.; Jagličić, Zvonko; Kusigerski, Vladan; Spasojević, Vojislav

doi:10.1016/j.ceramint.2012.10.216

Cited by 19 publications

(6 citation statements)

References 33 publications

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“…5,6 LaMnO 3 is an extremely welcome ABO 3 catalyst investigated so far. In the past several decades, the solid-state reaction, 7 combustion, 8 sol-gel, 9 co-precipitation, 10 hydrothermal 11 and biotechnological methods 12 were employed to synthesize lanthanum manganate catalyst. Meanwhile, the molten salt synthesis, which could o®er excellent ionic liquid medium for a rapid, low temperature and one-step water free synthesis route for single 13 and mixed oxides, 14,15 have been adopted to prepare some LaMO 3 (M ¼ Mn, Co, Fe, Ni and Al).…”

Section: Introductionmentioning

confidence: 99%

Molten Salt Synthesis of Strontium-Doped Lanthanum Manganite Nanoparticles with Enhanced Catalytic Performance for Toluene Combustion

YiShui

Liu

et al. 2016

NANO

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La 1Àx Sr x MnO 3À@ (LSMO) and LaMnO 3þ@ (LMO) nanoparticle catalysts have been synthesized via a one-step molten salt route. It was found that the partial substitution of lanthanum by strontium had a promoting e®ect on the catalytic performance for toluene oxidation. Under the condition of toluene concentration ¼ 1000 ppm, toluene/O 2 molar ratio ¼ 1=200 and the space velocity ¼ 20000 mL/(g h), the temperature required for 50% and 90% toluene combustion conversion was 150 C and 205 C over LSMO catalyst, respectively. It is concluded that the oxygen vacancy, the molar ratio Mn 4þ /Mn 3þ on the surface and the speci¯c surface area contribute to the improved catalytic performance of the LSMO nanoparticle materials via a one-step molten salt method.

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Section: Introductionmentioning

confidence: 99%

Molten Salt Synthesis of Strontium-Doped Lanthanum Manganite Nanoparticles with Enhanced Catalytic Performance for Toluene Combustion

YiShui

Liu

et al. 2016

NANO

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“…NdFeO 3 nanoparticles (NAP) were prepared by the self-propagating of high-temperature synthesis (SHS) which is based on a brief, exothermic burning reaction between oxidizing agent (potassium nitrate), organic fuel (glucose) and relevant metal nitrates [11]. The as prepared samples were annealed at 600…”

Section: Methodsmentioning

confidence: 99%

Exchange Bias Effect in NdFeO_3 System of Nanoparticles

et al. 2017

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We study the effect of nanometric size on the crystal structure, magnetic environment of iron and magnetization in NdFeO3 system of nanoparticles. The average particle size of NdFeO3 nanoparticles increases with annealing at 600• C from about 15 nm to 40 nm. The smallest particles on annealed sample have size approximately 30 nm and typically have character of single crystalline samples. All samples adopt orthorhombic crystal structure, space group Pnma with lattice parameters a = 5.5817 Å, b = 7.7663 Å and c = 5.456 Å for as prepared sample. The presence of superparamagnetic particles was indicated by the Mössbauer measurements. The reduction of dimensionality induces a decrease of TN1 from 691 K to 544 K. The shift of magnetic hysteresis loop in vertical and horizontal direction was observed at low temperatures after cooling in magnetic field. We attribute such behaviour to exchange bias effect and discuss in the frame of core-shell model. IntroductionThe exchange bias (EB) was discovered more than 55 years ago, by Meiklejohn and Bean on Co/CoO coreshell nanoparticles [1], and its characteristic signature is the horizontal shift of the centre of magnetic hysteresis loop from its normal position at H = 0 to another one at H e = 0 and vertical shift which can be characterised by remnant asymmetry µ e . EB usually occurs in systems which are composed by an antiferromagnet (AFM) that is in atomic contact with a ferromagnet (FM) after the system is cooled, below the respective Néel and Curie temperatures T N and T C , in an external cooling field H cf . EB phenomena were observed in various materials like the Laves phases, intermetallic compounds and alloys, binary alloys, the Heusler alloys [2] or on layered bulk fluorometallocomplex [3], where different aspects of magnetism were focused from the EB effect. The first evidence of the EB effect in mixed-valent manganites having perovskite structure was reported in a spontaneously phase separated system Pr 1/3 Ca 2/3 MnO 3 [4] which stimulated new interest for study of the EB effect in structurally single-phase compounds. In the case of a nanoparticle (NAP) system the surface to volume ratio becomes significantly large compared to the bulk counterpart. In such a case the surface effect dominates over and core-shell model can provide good interpretation of observed phenomena. Both concepts were frequently used for interpretation of EB effects in the La 1−x Ca x MnO 3 [5, 6], Nd 0.5 Ca 0.5 MnO 3 [7] and Pr 0.5 Ca

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“…Many preparation methods are used to synthesize these manganites including solid state reaction [27], ball milling technique [28], sol-gel Pechini method [16], and hydrothermal method [29,30]. Likewise, pure and alkaline-earth-substituted lanthanum manganites have been synthesized by self-propagating high-temperature synthesis (SHS) that is a low-cost and attractive method for rapidly generating large amount of nanosized manganites perovskites [31]. Urea and glycine are the commonly used as fuels in these combustion synthesis [32].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of La0.5Ca0.5−x□xMnO3 nanocrystalline manganites by sucrose assisted auto combustion route and study of their structural, magnetic and magnetocaloric properties

Moumen

Gagou

Chettab

et al. 2019

J Mater Sci: Mater Electron

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Perovskite manganite La 0.5 Ca 0.5-x □ x MnO 3 (LCMO) nanomaterials were elaborated using the sucrose modified auto combustion method. Rietveld refinements of the X-ray diffraction patterns of the crystalline structure confirm a single-phase orthorhombic state with Pbnm space group (No. 62). The Ca-vacancies were voluntarily created in the LCMO structure in order to study their influence on the magnetic behaviour in the system. The magnetic susceptibility was found to be highly enhanced in the sample with Ca-vacancies.Paramagnetic-to-ferromagnetic phase transition was evidenced in both samples around 254 K.This transition is, characterized by a drastic jump of the susceptibility in the sample with Cavacancies. The maximum of entropy change, observed for both compounds at magnetic field of 6T was 2.30 J kg -1 K -1 and 2.70 J kg -1 K -1 for the parent compound and the lacunar one respectively. The magnetocaloric adiabatic temperature change value calculated by indirect method was 5.6 K and 5.2 K for the non-lacunar and Ca-vacancy compound, respectively.The Ca-lacunar La 0.5 Ca 0.5-x □ x MnO 3 (x=0.05) reported in this work demonstrated overall enhancement of the magnetocaloric effect over the LCMO. The technique used to elaborate LCMO materials was beneficial to enhance the magnetocaloric effect and magnetic behaviour. Therefore, we conclude that this less costly environmentally friendly system can be considered as more advantageous candidate for magnetic refrigeration applications then the commonly Gd-based compounds.

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Modified self-propagating high-temperature synthesis of nanosized La0.7Ca0.3MnO3

Cited by 19 publications

References 33 publications

Molten Salt Synthesis of Strontium-Doped Lanthanum Manganite Nanoparticles with Enhanced Catalytic Performance for Toluene Combustion

Molten Salt Synthesis of Strontium-Doped Lanthanum Manganite Nanoparticles with Enhanced Catalytic Performance for Toluene Combustion

Exchange Bias Effect in NdFeO_3 System of Nanoparticles

Synthesis of La0.5Ca0.5−x□xMnO3 nanocrystalline manganites by sucrose assisted auto combustion route and study of their structural, magnetic and magnetocaloric properties

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