Superspin-glass like behavior of nanoparticle La0.7Ca0.3MnO3 obtained by mechanochemical milling

Spasojević, Vojislav; Mraković, Ana; Perović, M.; Kusigerski, Vladan; Blanuša, J.

doi:10.1007/s11051-010-0076-2

Cited by 28 publications

(18 citation statements)

References 21 publications

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“…The obtained values of K e f f are similar to that obtained for bccFe nanoparticles with diameters in 3 -40 nm range prepared by a vapour condensation process [20]. The knowledge of the anisotropy constant K e f f and the saturation magnetization M S , for the case of uniaxial anisotropy, enables calculation of the anisotropy field H a with the equation [22]:…”

Section: Resultssupporting

confidence: 77%

Magnetic characterization of nanocrystalline iron samples with different size distributions

Typek

Żołnierkiewicz

Pelka

et al. 2014

Materials Science-Poland

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Nanocrystalline iron was obtained by fusing magnetite and promoters. The oxidized form was reduced with hydrogen and passivated (sample P0). The average nanocrystallite size in sample P0 was d(P0) =16 nm and the width of size distribution was σ (P0) = 18 nm. Samples of nanocrystalline iron with narrower diameter ranges and larger and smaller average crystallite sizes were also synthesized. They were: sample P1 (d(P1) = 28 nm, σ (P1) = 5 nm), sample P2 (d(P2) = 22 nm, σ (P1) = 5 nm), sample P3 (d(P3) = 12 nm, σ (P1) = 9 nm). These four samples were studied at room temperature by dc magnetization measurements and ferromagnetic resonance at microwave frequency. Correlations between samples sizes distributions (average size and width of the sizes) and magnetic parameters (effective magnetization, anisotropy field, anisotropy constant, FMR linewidth) were investigated. It was found that the anisotropy field and effective magnetization determined from FMR spectra scale linearly with nanoparticle sizes, while the effective magnetic anisotropy constant determined from the hysteresis loops decreases with nanoparticle size increase.

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Section: Resultssupporting

confidence: 77%

Magnetic characterization of nanocrystalline iron samples with different size distributions

Typek

Żołnierkiewicz

Pelka

et al. 2014

Materials Science-Poland

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“…Previous investigation also demonstrated that the coercive field increases with decreasing particle size [62]. In our investigation, at 20 K, the coercive field is higher for ultrasonically prepared nanoparticles compared to that of bulk materials as was also observed in [20] figure 4, that from the surface of the nanoparticles, vacancies have been removed, while in the core of the nanoparticles it may still be present. More specifically, at 500 eV, the electron escape depth is about 5 nm and hence XPS indicates vacancies that have been removed from the particles' surface while the core volume may still have the vacancies of the bulk.…”

Section: Methodssupporting

confidence: 81%

Preparation of high crystalline nanoparticles of rare-earth based complex pervoskites and comparison of their structural and magnetic properties with bulk counterparts

Basith

Islam

Ahmmad

et al. 2017

Mater. Res. Express

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A simple route to prepare Gd 0.7 Sr 0.3 MnO 3 nanoparticles by ultrasonication of their bulk powder materials is presented in this article. For comparison, Gd 0.7 Sr 0.3 MnO 3 nanoparticles are also prepared by ball milling. The prepared samples are characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), energy dispersive X-ray (EDX), X-ray photoelectron spectroscope (XPS), and Superconducting Quantum Interference Device (SQUID) magnetometer. XRD Rietveld analysis is carried out extensively for the determination of crystallographic parameters and the amount of crystalline and amorphous phases. FESEM images demonstrate the formation of nanoparticles with average particle size in the range of 50-100 nm for both ultrasonication and 4 hours (h) of ball milling. The bulk materials and nanoparticles synthesized by both ultrasonication and 4 h ball milling exhibit a paramagnetic to spin-glass transition. However, nanoparticles synthesized by 8 h and 12 h ball milling do not reveal any phase transition, rathershow an upturn of magnetization at low temperature. The degradation of the magnetic properties in ball milled nanoparticles may be associated with amorphization of the nanoparticles due to ball milling particularly for milling time exceeding 8 h. This investigation demonstrates the potential of ultrasonication as a simple route to prepare high crystalline rare-earth based manganite nanoparticles with improved control compared to the traditional ball milling technique.

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“…La 1 − x Ca x MnO 3 (LCMO) manganite, as a prototypical system of perovskite manganites, has been of great interest because of its magnetic behavior and rich phase diagram [8, 9]. In the past decade, various synthesized methods such as sol-gel process [10, 11], polymeric precursor route [12], mechanical milling method [13], molten salt method [14] have been used to synthesize perovskite LCMO nanoparticles, and the effect of particle size on the structural, transport, and optical properties are also investigated [15–18]. Simultaneously, Ca-doped PrMnO 3 (Pr 1 − x Ca x MnO 3 : PCMO) also have some unusual electrical, magnetic, and optical properties, which are dependent on the Ca-doped concentration [19, 20].…”

Section: Introductionmentioning

confidence: 99%

Microstructural, Magnetic, and Optical Properties of Pr-Doped Perovskite Manganite La0.67Ca0.33MnO3 Nanoparticles Synthesized via Sol-Gel Process

Xia

Xue

et al. 2018

Nanoscale Res Lett

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We report on microstructural, magnetic, and optical properties of Pr-doped perovskite manganite (La1 − xPrx)0.67Ca0.33MnO3 (LPCMO, x = 0.0–0.5) nanoparticles synthesized via sol-gel process. Structural characterizations (X-ray and electron diffraction patterns, (high resolution) TEM images) provide information regarding the phase formation and the single-crystalline nature of the LPCMO systems. X-ray and electron diffraction patterns reveal that all the LPCMO samples crystallize in perovskite crystallography with an orthorhombic structure (Pnma space group), where the MnO6 octahedron is elongated along the b axis due to the Jahn-Teller effect. That is confirmed by Raman spectra. Crystallite sizes and grain sizes were calculated from XRD and TEM respectively, and the lattice fringes resolved in the high-resolution TEM images of individual LPCMO nanoparticle confirmed its single-crystalline nature. FTIR spectra identify the characteristic Mn–O bond stretching vibration mode near 600 cm− 1, which shifts towards high wavenumbers with increasing post-annealing temperature or Pr-doping concentration, resulting in further distortion of the MnO6 octahedron. XPS revealed dual oxidation states of Mn3+ and Mn4+ in the LPCMO nanoparticles. UV-vis absorption spectra confirm the semiconducting nature of the LPCMO nanoparticles with optical bandgaps of 2.55–2.71 eV. Magnetic measurements as a function of temperature and magnetic field at field cooling and zero-field cooling modes, provided a Curie temperature around 230 K, saturation magnetization of about 81 emu/g, and coercive field of 390 Oe at 10 K. Such magnetic properties and the semiconducting nature of the LPCMO nanoparticles will make them as suitable candidate for magnetic semiconductor spintronics.

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Superspin-glass like behavior of nanoparticle La0.7Ca0.3MnO3 obtained by mechanochemical milling

Cited by 28 publications

References 21 publications

Magnetic characterization of nanocrystalline iron samples with different size distributions

Magnetic characterization of nanocrystalline iron samples with different size distributions

Preparation of high crystalline nanoparticles of rare-earth based complex pervoskites and comparison of their structural and magnetic properties with bulk counterparts

Microstructural, Magnetic, and Optical Properties of Pr-Doped Perovskite Manganite La0.67Ca0.33MnO3 Nanoparticles Synthesized via Sol-Gel Process

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