Preparation of nanostructured manganites SmMnO3 and Sm0.5Sr0.5MnO3 by mechanochemical synthesis method

Hannora, Ahmed E.; Hanna, F.F.

doi:10.1007/s10854-019-01605-5

Cited by 9 publications

(4 citation statements)

References 44 publications

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“…17,34 In this current research work La 0.6 Sr 0.4 MnO 3 sample is planned to be prepared by the mechanochemical synthesis (ball milling technique). Our previous studies 35,36 (concerning perovskite manganite compounds) confirm the ability of the ball milling technique followed by annealing treatment to produce nanocrystalline single phased samples with perovskite structure. The study of structural and magnetic properties of La 0.6 Sr 0.4 MnO 3 nanoparticles obtained by mechanochemical synthesis is the object of this current research work.…”

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confidence: 60%

“…Lanthanum oxide (99.9%, SRL), Strontium carbonate (99.9%, LOBA Chemie), and Manganese oxide (99.8%, SRL) were used for the synthesis of LSMO sample with stoichiometric composition La 0.6 Sr 0.4 MnO 3 . According to our previous research works, 35,36 the initial oxides were ball-milled for 10 h at 600 cc stainless steel ball mill rotating with 500 rpm. The balls to powder ratio was 20:1.…”

Section: Experimental Workmentioning

confidence: 99%

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Mechanochemical Synthesis of Soft Ferromagnetic Perovskite Lanthanum Strontium Manganite (La_0.6Sr_0.4MnO₃)

Hanna¹,

Ibrahim²,

Hannora³

2022

ECS J. Solid State Sci. Technol.

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A nanocrystalline La0.6Sr0.4MnO3 sample with perovskite structure was successfully prepared by mechanochemical synthesis. Mechanical treatment for 10 hours followed by annealing at 1100°C results in the formation of single perovskite lanthanum strontium manganite phase with rhombohedral crystal structure and R3 ̅C symmetry. The heat-treated sample crystallite size, calculated from X-ray diffraction pattern, was about 84 nm. The scanning electron microscope images indicated a high degree of fine structure. The formation of single perovskite phase was confirmed by Fourier transform, infrared measurements. The magnetic measurements showed the soft ferromagnetic behavior of the obtained sample. The saturation magnetization was found to be lower than that expected from theoretical calculation for perfect ferromagnetic ordering and lowed than the saturation magnetization published for bulk sample. This was explained in the light of the core/shell model of manganite nanoparticles. The obtained sample was found to have a negative coefficient of magnetoresistance at room temperature of about (-3.5 %) with the application of 25 KOe magnetic field.

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confidence: 60%

Section: Experimental Workmentioning

confidence: 99%

Mechanochemical Synthesis of Soft Ferromagnetic Perovskite Lanthanum Strontium Manganite (La_0.6Sr_0.4MnO₃)

Hanna¹,

Ibrahim²,

Hannora³

2022

ECS J. Solid State Sci. Technol.

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“…The FTIR spectra of two representative samples SM4 and SMQ are shown in figure 3. In the FTIR spectrum of SMQ strong broadband at 520 cm −1 is observed which corresponds to the Mn-O-Mn stretching vibration in MnO 6 octahedron [13]. Besides this characteristic band, a few weak bands at 780 cm −1 (C-H bending vibration), 856 cm −1 (out of plane bending vibration of SrCO 3 ), 1216 cm −1 (C-O stretching vibration), 1369 cm −1 (C-H stretching vibration), 1444 cm −1 (asymmetric stretching vibration of C-O bonds) and 1737 cm −1 (bending vibration of -OH bond) are also seen in the spectrum.…”

Section: Ftir Spectroscopic Studiesmentioning

confidence: 98%

Thermally activated polaron tunnelling conduction mechanism in Sr₂MnO₄ synthesized by quenching in ambient atmosphere

Nirala¹,

Yadav²,

Upadhyay³

2021

Phys. Scr.

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The oxide Sr2MnO4 was synthesized using the solid-state reaction technique. Quenching in air from 1500 °C to room temperature yielded the pure phase powder of Sr2MnO4. The purity of synthesized powder was further examined by FTIR analysis. The Rietveld refinement of XRD data confirmed the tetragonal structure and I4/mmm space group. The band gap, computed from the Tauc’s plot, was found to be 1.15 eV. The XPS analysis depicted the presence of Mn3+ and Mn4+ valence states. Measurement of the AC electrical conductivity over wide temperature (30 °C–500 °C) and frequency (0.020–2 MHz) ranges were carried out. The conduction mechanism changed from small polaron tunnelling (<270 °C) to non-overlapping large polaron tunnelling (>270 °C). The frequency versus imaginary part of the impedance (Z″) and modulus (M″) plots exhibited a change in the conduction domain with increase in temperature. This result was further verified by the Ghosh’s scaling of the conductivity spectra.

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“…For example, a solid state-reaction method occurs at high temperatures (> 1000 o C), which results in non-porous, irregular powder products, uncontrolled particle size, and low surface area (Kaewpanha et al 2019). Other interesting chemical approaches in low sintering temperature and short reaction time (Yule et al 2019), such as the sol-gel process and co-precipitation, have been reported to prepare materials with improved control of grain size and uniform particle size distribution and morphology (Hannora and Hanna 2019, Ghozza et al 2013, Shlapa et al 2018. Therefore, we focus on the preparation of La0.7Sr0.3MnO3 and La0.7Sr0.3CoO3 by the co-precipitation method, but the solgel auto-combustion route prepares La0.7Sr0.3FeO3 samples.…”

Section: Introductionmentioning

confidence: 99%

Structure, magnetic, and photocatalysis of La0.7Sr0.3MO3 (M = Mn, Co, and Fe) nanoparticle perovskite: Novel photocatalytic materials

Ghozzaa

Yahia

Hussien

2023

Preprint

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The present study, La0.7Sr0.3MO3 (M = Mn-, Co-, and Fe-) perovskite, has successfully been synthesized via two techniques; co-precipitation, and sol-gel auto-combustion. XRD, SEM, and EDX characterized the prepared samples. XRD and SEM showed that the as-prepared La0.7Sr0.3MnO3 and La0.7Sr0.3CoO3 have multiphase. La0.7Sr0.3FeO3, in comparison, is nanosized, has a single-phase perovskite, and has a rather homogenous particle size distribution. Additionally, EDX mapping analysis shows that all pieces are distributed uniformly. All calcined powders contain 100% LSF, more than 15% perovskite phase of LSC, 47% LSM, and other secondary phases such cobalt oxide, according to X-ray diffractometer results. At room temperature and magnetic field ± 20 kG. La0.7Sr0.3MnO3 exhibited weak ferromagnetic behaviour in a low magnetic field, whereas diamagnetic behaviour was seen in a high magnetic field. La0.7Sr0.3FeO3 samples behave as strong ferromagnetic. On the contrary, the photodegradation of La0.7Sr0.3MnO3 is 99% compared to 75% and 91% for other samples under UVA lights. The degradation rate for La0.7Sr0.3MnO3 is 0.179 higher, about 3.25 and 2.23, than the other samples. A La0.7Sr0.3MnO3 nanocomposite perform as a photocatalyst to enhance the efficiency of Methylene blue photodegradation.. This study boosts good UVA- photocatalysts with high efficiency for different kinds of dyes. Hence the catalyst possessed high stability and effieiency for continuous treatment of wastewater.

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Preparation of nanostructured manganites SmMnO3 and Sm0.5Sr0.5MnO3 by mechanochemical synthesis method

Cited by 9 publications

References 44 publications

Mechanochemical Synthesis of Soft Ferromagnetic Perovskite Lanthanum Strontium Manganite (La_0.6Sr_0.4MnO₃)

Mechanochemical Synthesis of Soft Ferromagnetic Perovskite Lanthanum Strontium Manganite (La_0.6Sr_0.4MnO₃)

Thermally activated polaron tunnelling conduction mechanism in Sr₂MnO₄ synthesized by quenching in ambient atmosphere

Structure, magnetic, and photocatalysis of La0.7Sr0.3MO3 (M = Mn, Co, and Fe) nanoparticle perovskite: Novel photocatalytic materials

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Preparation of nanostructured manganites SmMnO3 and Sm0.5Sr0.5MnO3 by mechanochemical synthesis method

Cited by 9 publications

References 44 publications

Mechanochemical Synthesis of Soft Ferromagnetic Perovskite Lanthanum Strontium Manganite (La0.6Sr0.4MnO3)

Mechanochemical Synthesis of Soft Ferromagnetic Perovskite Lanthanum Strontium Manganite (La0.6Sr0.4MnO3)

Thermally activated polaron tunnelling conduction mechanism in Sr2MnO4 synthesized by quenching in ambient atmosphere

Structure, magnetic, and photocatalysis of La0.7Sr0.3MO3 (M = Mn, Co, and Fe) nanoparticle perovskite: Novel photocatalytic materials

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Mechanochemical Synthesis of Soft Ferromagnetic Perovskite Lanthanum Strontium Manganite (La_0.6Sr_0.4MnO₃)

Mechanochemical Synthesis of Soft Ferromagnetic Perovskite Lanthanum Strontium Manganite (La_0.6Sr_0.4MnO₃)

Thermally activated polaron tunnelling conduction mechanism in Sr₂MnO₄ synthesized by quenching in ambient atmosphere