Syntheses, crystal structures, optical, Raman spectroscopy, and magnetic properties of two polymorphs of NaMnPO4

Jana, Subhendu and Ishtiyak, Mohd and Jai, Prakash and et al, . (2020) Syntheses, crystal structures, optical, Raman spectroscopy, and magnetic properties of two polymorphs of NaMnPO4. Materials Research Bulletin. ISSN 0025-5408 (In Press)

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Abstract

The monophasic natrophilite form of NaMnPO4 was synthesized using a simple and scalable one-step hydrothermal method. The heat treatment of the natrophilite NaMnPO4 in the air resulted in the formation of the high-temperature maricite polymorph of NaMnPO4. The crystal structures of these two polymorphs were confirmed by the Rietveld refinements and Raman spectroscopy. The DSC study of the natrophilite form shows a broad exothermic peak indicative of a second-order phase transition to high-temperature maricite form. The band gaps (Eg) of 5.18(2) and 1.88(2) eV were estimated for natrophilite and maricite forms, respectively, by the UV-vis absorption studies. Magnetic studies on polycrystalline natrophilite NaMnPO4 show a complex temperature dependence of magnetic susceptibility, which could be attributed to a canted antiferromagnetic behavior with the Néel’s temperature (TN) of 31 K and an anomaly temperature (T*) of 29 K. Maricite NaMnPO4 also show antiferromagnetic interaction of Mn2+ spins with TN of 18 K.

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IITH Creators:
IITH CreatorsORCiD
Jai, PrakashUNSPECIFIED
Item Type: Article
Uncontrolled Keywords: oxides, magnetic materials, solvothermal, magnetic properties, X-ray diffraction
Subjects: Chemistry
Divisions: Department of Chemistry
Depositing User: Team Library
Date Deposited: 27 Feb 2020 04:33
Last Modified: 27 Feb 2020 04:33
URI: http://raiith.iith.ac.in/id/eprint/7474
Publisher URL: https://doi.org/10.1016/j.materresbull.2020.110835
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