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Erschienen in: Journal of Sol-Gel Science and Technology 3/2013

01.09.2013 | Original Paper

Characterization, conductivity and photocatalytic studies of AHfM(PO4)3 (A = Na and Ag; M = Ti and Zr) powders synthesized by sol–gel method

verfasst von: Suresh Palla, G. Ravi, J. R. Reddy, Naveen Kumar Veldurthi, Radha Velchuri, G. Prasad, N. R. Munirathnam, M. Vithal

Erschienen in: Journal of Sol-Gel Science and Technology | Ausgabe 3/2013

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Abstract

Materials belonging to NASICON family of compositions NaHfM(PO4)3 and AgHfM(PO4)3 (M = Ti and Zr) are prepared by sol–gel and ion exchange methods, respectively. Ethylene glycol is used as a gelating agent. All the compositions are characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy, 31P MAS NMR, UV–Vis DRS, XPS and energy dispersive spectral methods. All these phosphates are crystallized in rhombohedral lattice with space group\(R\overline{3} c\). These compounds exhibit characteristic PO4 vibrational modes in their FT-IR spectra. The 31P MAS NMR gave broad signals indicating distribution of chemical environments around P ion. The dc and ac conductivity of AgHfM(PO4)3 (M = Ti and Zr) are higher compared to their sodium containing compounds. The Cole–Cole plots of impedance show semicircles between 373 and 623 K. The variation of dc conductivity with temperature follows the Arrhenius equation. The photocatalytic activity of all the samples was studied against methylene blue decomposition using sun light. AgHfM(PO4)3 (M = Ti and Zr) have shown higher photoactivity than the sodium containing Nasicons.

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Metadaten
Titel
Characterization, conductivity and photocatalytic studies of AHfM(PO4)3 (A = Na and Ag; M = Ti and Zr) powders synthesized by sol–gel method
verfasst von
Suresh Palla
G. Ravi
J. R. Reddy
Naveen Kumar Veldurthi
Radha Velchuri
G. Prasad
N. R. Munirathnam
M. Vithal
Publikationsdatum
01.09.2013
Verlag
Springer US
Erschienen in
Journal of Sol-Gel Science and Technology / Ausgabe 3/2013
Print ISSN: 0928-0707
Elektronische ISSN: 1573-4846
DOI
https://doi.org/10.1007/s10971-013-3108-4

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