Synthesis of La1−xSrxMnO3 cubic crystals with adjustable doping levels

Li, Chiping; Li, Tong; Wang, Bo; Yan, Hui

doi:10.1016/j.jcrysgro.2006.06.005

Cited by 14 publications

(6 citation statements)

References 16 publications

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“…And the gradual shifts toward high-angle orientation could be induced by the decrease in interplanar distance after strontium substitution [23]. A similar phenomenon regarding the diffraction angle shift was previously reported by Li et al [21]. And the specific surface area (SSA) of La 1−x Sr x MnO 3 is given in Table 2.…”

Section: Resultssupporting

confidence: 78%

“…Furthermore, it is observed that the diffraction peaks for x � 0.2-0.8 are shifted toward a higher angle orientation over those substituted catalysts in comparison with LaMnO 3 . e partial substitution of La 3+ by Sr 2+ will lead to Mn 3+ (r � 0.58Å) transfer into smaller Mn 4+ (r � 0.53Å), resulting in lattice shrinkage [21,22]. And the gradual shifts toward high-angle orientation could be induced by the decrease in interplanar distance after strontium substitution [23].…”

Section: Resultsmentioning

confidence: 99%

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Facile One-Step Flame Synthesis of La1−xSrxMnO3 Nanoparticles for CO Catalytic Oxidation

Zhou

2021

Journal of Chemistry

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A large amount of CO as hazardous emission in the iron ore sintering process has caused severe harm to the environment and human health. To control the emission of CO more effectively, the preparation of highly efficient catalysts has attracted much attention. In this study, the La1-xSrxMnO3 (0 ≤ x < 1) perovskite catalysts with different Sr2+ contents were prepared by the one-step flame synthesis method to treat CO pollutants in the iron and steel industry. The influence of Sr2+ doping on the structure and activity of catalytic were characterized and analyzed. La1-xSrxMnO3 perovskite catalysts exhibit good perovskite phases and loose spherical structures. The specific surface areas are between 4.1 and 12.0 m2 g−1. Combined with the results of H2-TPR and O2-TPD, the improvement of catalytic activity of La1-xSrxMnO3 perovskite can be attributed to the high concentration of active centers and oxygen vacancies. Significantly, the La0.4Sr0.6MnO3 catalyst presented the best reducibility and high content of absorbed active oxygen species, leading to a superior CO oxidation catalytic activity and reaches 50% CO conversion at 134.9°C and 90% at 163.2°C, respectively. The effects of water vapor and CO2 on the oxidation activity of La1-xSrxMnO3 perovskite was investigated. The flame-produced catalysts exhibit favorable catalytic stability and antisintering ability, achieving 100% CO conversion after fifth consecutive oxidation cycles.

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Section: Resultssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Facile One-Step Flame Synthesis of La1−xSrxMnO3 Nanoparticles for CO Catalytic Oxidation

Zhou

2021

Journal of Chemistry

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“…166 This route has been now used for the preparation of a number of 'half-doped' manganites, as shown in Table 1, [167][168][169][170][171][172][173][174] but also some work has been done on other compositions where the average manganese oxidation state is not equal to 3.5. 168,[175][176][177][178][179] It is possible that more detailed characterisation of these last phases is needed, since the precise manganese oxidation state can depend on oxygen content, which may vary from the stoichiometric value, and also phase separation may occur on various length scales such that the bulk composition is not actually representative of the true nature of the sample. It is not clear in some of the reported studies that the range of experimental techniques needed to prove these points has actually been applied.…”

Section: Manganitesmentioning

confidence: 99%

Solvothermal synthesis of perovskites and pyrochlores: crystallisation of functional oxides under mild conditions

2010

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In this critical review we consider the large literature that has accumulated in the past 5-10 years concerning solution-mediated crystallisation of complex oxide materials using hydrothermal, or more generally solvothermal, reaction conditions. The aim is to show how the synthesis of dense, mixed-metal oxide materials, usually prepared using the high temperatures associated with solid-chemistry, is perfectly feasible from solution in one step reactions, typically at temperatures as low as 200 °C, and that important families of oxide materials have now been reported to crystallise using such synthetic approaches. We will focus on two common structures seen in oxide chemistry, ABO(3) perovskites and A(2)B(2)O(6)O' pyrochlores, and include a systematic survey of the variety of chemical elements now included in these two prototypical structure types, from transition metals, in families of materials that include titanates, niobates, manganites and ferrites, to main-group elements in stannates, plumbates and bismuthates. The significant advantages of solution-mediated crystallisation are well illustrated by the recent literature: examples are provided of elegant control of crystal form from the nanometre to the micron length scale to give thin films, anisotropic crystal morphologies, or hierarchical structures of materials with properties desirable for many important contemporary applications. In addition, new metastable materials have been reported, not stable once high temperatures and pressures are applied and hence not amenable using conventional synthesis. We critically discuss the possible control offered by solvothermal synthesis from crystal chemistry to crystal form and how the discovery of new materials may be achieved. Computer simulation, combinatorial synthesis approaches and in situ methods to follow crystallisation will be vital in providing the predictability in synthesis that is needed for rational design of new materials (232 references).

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“…Sr-doped LaMnO 3 or LSMO is particularly of interest due to its good magnetic, electrical, and catalytic properties and nowadays is increasingly becoming an attractive possibility in several biomedical applications. A variety of methods has been attempted for the preparation of highly homogeneous and fine powders of these perovskite manganites, including the citrate-gel process [ 3 ], sol–gel route [ 4 ], molten salt method [ 5 ], autocombustion process [ 6 ], and hydrothermal synthesis [ 7 ], to name just a few. Among these established synthesis methods, it is still critical to find simple and cost effective routes to synthesize LSMO nanocrystalline with a well controlled, reproducible, and narrow size distribution of ferromagnetic nanoparticles with large magnetic moment per particle by utilization of cheap, nontoxic, and environmentally benign precursors.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and Cytotoxicity Properties of La1−xSr x MnO3(0 ≤ x ≤ 0.5) Nanoparticles Prepared by a Simple Thermal Hydro-Decomposition

Daengsakul

Thomas

et al. 2009

Nanoscale Res Lett

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This study reports the magnetic and cytotoxicity properties of magnetic nanoparticles of La1−xSrxMnO3(LSMO) withx = 0, 0.1, 0.2, 0.3, 0.4, and 0.5 by a simple thermal decomposition method by using acetate salts of La, Sr, and Mn as starting materials in aqueous solution. To obtain the LSMO nanoparticles, thermal decomposition of the precursor was carried out at the temperatures of 600, 700, 800, and 900 °C for 6 h. The synthesized LSMO nanoparticles were characterized by XRD, FT-IR, TEM, and SEM. Structural characterization shows that the prepared particles consist of two phases of LaMnO3(LMO) and LSMO with crystallite sizes ranging from 20 nm to 87 nm. All the prepared samples have a perovskite structure with transformation from cubic to rhombohedral at thermal decomposition temperature higher than 900 °C in LSMO samples ofx ≤ 0.3. Basic magnetic characteristics such as saturated magnetization (MS) and coercive field (HC) were evaluated by vibrating sample magnetometry at room temperature (20 °C). The samples show paramagnetic behavior for all the samples withx = 0 or LMO, and a superparamagnetic behavior for the other samples havingMSvalues of ~20–47 emu/g and theHCvalues of ~10–40 Oe, depending on the crystallite size and thermal decomposition temperature. Cytotoxicity of the synthesized LSMO nanoparticles was also evaluated with NIH 3T3 cells and the result shows that the synthesized nanoparticles were not toxic to the cells as determined from cell viability in response to the liquid extract of LSMO nanoparticles.

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Synthesis of La1−xSrxMnO3 cubic crystals with adjustable doping levels

Cited by 14 publications

References 16 publications

Facile One-Step Flame Synthesis of La1−xSrxMnO3 Nanoparticles for CO Catalytic Oxidation

Facile One-Step Flame Synthesis of La1−xSrxMnO3 Nanoparticles for CO Catalytic Oxidation

Solvothermal synthesis of perovskites and pyrochlores: crystallisation of functional oxides under mild conditions

Magnetic and Cytotoxicity Properties of La1−xSr x MnO3(0 ≤ x ≤ 0.5) Nanoparticles Prepared by a Simple Thermal Hydro-Decomposition

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