NDLI: Structural and magnetic phase transition of sol–gel-synthesized Cr$_{2}$O$_{3}$ and MnCr$_{2}$O$

Content Provider	Springer Nature Link
Author	Afzal, Adnan Atiq, Shahid Saleem, Murtaza Ramay, Shahid M. Naseem, Shahzad Siddiqi, Saadat A.
Copyright Year	2016
Abstract	Cr$_{2}$O$_{3}$ and MnCr$_{2}$O$_{4}$ spinel chromite nanoparticles were synthesized using chemically derived sol–gel technique. Crystal structure was analyzed using X-ray diffraction, and phase transition from a rhombohedral symmetry (R-3c) for Cr$_{2}$O$_{3}$ to a spinel cubic symmetry (Fd3 m) for MnCr$_{2}$O$_{4}$ has been observed. Data obtained from diffraction were also utilized to evaluate the lattice parameters, crystallite size and unit cell volume. Micrographs obtained using a field emission scanning electron microscope exhibited well-shaped, homogenously distributed 30–70-nm-sized nanoparticles, with well-defined grain. Stoichiometric composition of all the elements present in the samples was confirmed using energy-dispersive X-ray spectroscopy. Dynamic light scattering measurement was performed to corroborate the hydrodynamic diameter and distribution of Cr$_{2}$O$_{3}$ and MnCr$_{2}$O$_{4}$ nanoparticles. The magnetic behavior of samples was scrutinized as a function of temperature and applied field. It was observed that Cr$_{2}$O$_{3}$ exhibited paramagnetic behavior both at room temperature and at 5 K, while a magnetic phase transition from ferro to para was observed in MnCr$_{2}$O$_{4}$ with a Curie temperature, T $_{c}$ ~ 50 K.
Starting Page	96
Ending Page	102
Page Count	7
File Format	PDF
ISSN	09280707
Journal	Journal of Sol-Gel Science and Technology
Volume Number	80
Issue Number	1
e-ISSN	15734846
Language	English
Publisher	Springer US
Publisher Date	2016-05-12
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Chromites Structural phase transition Structural morphology Magnetic phase transition Ceramics, Glass, Composites, Natural Methods Inorganic Chemistry Optical and Electronic Materials Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Chemistry Materials Chemistry Biomaterials Condensed Matter Physics Electronic, Optical and Magnetic Materials

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