We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Microstructural, Magnetic, and Optical Properties of Pr-Doped Perovskite Manganite La<sub>0.67</sub>Ca<sub>0.33</sub>MnO<sub>3</sub> Nanoparticles Synthesized via Sol-Gel Process.
- Authors
Xia, Weiren; Wu, Heng; Xue, Piaojie; Zhu, Xinhua
- Abstract
We report on microstructural, magnetic, and optical properties of Pr-doped perovskite manganite (La1 − xPrx)0.67Ca0.33MnO3 (LPCMO, <italic>x</italic> = 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 (<italic>Pnma</italic> space group), where the MnO6 octahedron is elongated along the <italic>b</italic> 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.
- Subjects
OPTICAL properties; PEROVSKITE; NANOPARTICLE synthesis; SOL-gel processes; ELECTRON diffraction; MANGANESE oxides
- Publication
Nanoscale Research Letters, 2018, Vol 13, Issue 1, p1
- ISSN
1931-7573
- Publication type
Article
- DOI
10.1186/s11671-018-2553-y