Microstructural, Magnetic, and Optical Properties of Pr-Doped Perovskite Manganite La0.67Ca0.33MnO3 Nanoparticles Synthesized via Sol-Gel Process
Abstract 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)...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2018-05-01
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| Series: | Nanoscale Research Letters |
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| Online Access: | http://link.springer.com/article/10.1186/s11671-018-2553-y |
| _version_ | 1797711401466200064 |
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| author | Weiren Xia Heng Wu Piaojie Xue Xinhua Zhu |
| author_facet | Weiren Xia Heng Wu Piaojie Xue Xinhua Zhu |
| author_sort | Weiren Xia |
| collection | DOAJ |
| description | Abstract 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. |
| first_indexed | 2024-03-12T07:06:33Z |
| format | Article |
| id | doaj.art-c960c11d27814a02aec90a626f44e0a6 |
| institution | Directory Open Access Journal |
| issn | 1931-7573 1556-276X |
| language | English |
| last_indexed | 2024-03-12T07:06:33Z |
| publishDate | 2018-05-01 |
| publisher | SpringerOpen |
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| series | Nanoscale Research Letters |
| spelling | doaj.art-c960c11d27814a02aec90a626f44e0a62023-09-02T23:25:55ZengSpringerOpenNanoscale Research Letters1931-75731556-276X2018-05-0113111310.1186/s11671-018-2553-yMicrostructural, Magnetic, and Optical Properties of Pr-Doped Perovskite Manganite La0.67Ca0.33MnO3 Nanoparticles Synthesized via Sol-Gel ProcessWeiren Xia0Heng Wu1Piaojie Xue2Xinhua Zhu3National Laboratory of Solid State Microstructures, School of Physics, Nanjing UniversityNational Laboratory of Solid State Microstructures, School of Physics, Nanjing UniversityNational Laboratory of Solid State Microstructures, School of Physics, Nanjing UniversityNational Laboratory of Solid State Microstructures, School of Physics, Nanjing UniversityAbstract 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.http://link.springer.com/article/10.1186/s11671-018-2553-y(La1 − xPrx)0.67Ca0.33MnO3 (LPCMO) nanoparticlesPerovskite manganitesMicrostructural characterizationSpectral analysesMagnetic propertiesOptical bandgaps |
| spellingShingle | Weiren Xia Heng Wu Piaojie Xue Xinhua Zhu Microstructural, Magnetic, and Optical Properties of Pr-Doped Perovskite Manganite La0.67Ca0.33MnO3 Nanoparticles Synthesized via Sol-Gel Process Nanoscale Research Letters (La1 − xPrx)0.67Ca0.33MnO3 (LPCMO) nanoparticles Perovskite manganites Microstructural characterization Spectral analyses Magnetic properties Optical bandgaps |
| title | Microstructural, Magnetic, and Optical Properties of Pr-Doped Perovskite Manganite La0.67Ca0.33MnO3 Nanoparticles Synthesized via Sol-Gel Process |
| title_full | Microstructural, Magnetic, and Optical Properties of Pr-Doped Perovskite Manganite La0.67Ca0.33MnO3 Nanoparticles Synthesized via Sol-Gel Process |
| title_fullStr | Microstructural, Magnetic, and Optical Properties of Pr-Doped Perovskite Manganite La0.67Ca0.33MnO3 Nanoparticles Synthesized via Sol-Gel Process |
| title_full_unstemmed | Microstructural, Magnetic, and Optical Properties of Pr-Doped Perovskite Manganite La0.67Ca0.33MnO3 Nanoparticles Synthesized via Sol-Gel Process |
| title_short | Microstructural, Magnetic, and Optical Properties of Pr-Doped Perovskite Manganite La0.67Ca0.33MnO3 Nanoparticles Synthesized via Sol-Gel Process |
| title_sort | microstructural magnetic and optical properties of pr doped perovskite manganite la0 67ca0 33mno3 nanoparticles synthesized via sol gel process |
| topic | (La1 − xPrx)0.67Ca0.33MnO3 (LPCMO) nanoparticles Perovskite manganites Microstructural characterization Spectral analyses Magnetic properties Optical bandgaps |
| url | http://link.springer.com/article/10.1186/s11671-018-2553-y |
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