Interplay between magnetic ion and amorphous carbon in Na3V2(PO4)3/C nanocomposite

Cheng Wei Kao, Chun Chuen Yang, Chin Wei Wang, Shu Han Zhuang, Yung Hsiang Tung, Ting Wei Hsu, Wei Chun Wu, Wei Ren Liu, Kuen Song Lin

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The crystal structure, magnetic properties and electrical properties of Na3V2(PO4)3/C nanocomposite were investigated using neutron and x-ray powder diffractometer, Raman spectroscopy, and experiments on ac magnetic susceptibility and ac impendence. Na3V2(PO4)3 has a trigonal structure with an R-3c space group and the carbon film coating has an amorphous phase at temperatures between 5 K and 300 K. An external magnetic field enlarged the lattice constant size parallel to the c-axis but had no effect on that parallel to the a-axis. Short-range magnetic correlation was observed below 220 K. A magnetic field of 1 mT was equivalent to a 1.4(2) K thermal effect the c-axis. The carbon film yielded Raman peaks associated with D1-, D3-, D4-, and G-bands. The ac magnetic susceptibility curve is consistent with the Curie-Weiss law. The magnetic moment of V3+ and Curie temperature TC of the sample were 2.91(6) μB/f.u. and 15(4) K, respectively. Ac impedance (Z) experiments demonstrated that the external magnetic field had no any effect on Z at 300 K. This investigation reveals a possibility of lattice and phonon control by the application of an external magnetic field. Its findings may be useful in developing lithium or sodium ion batteries.

Original languageEnglish
Article number035134
JournalAIP Advances
Issue number3
StatePublished - 1 Mar 2019


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