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Title: Preparation, characterization and conductivity studies of NaAlSb(PO<sub>4</sub>)<sub>3</sub> and HAlSb(PO<sub>4</sub>)<sub>3</sub>
Authors: Anantharamulu, N
Velchuri, Radha
Sarojini, T
Madhavi, K
Prasad, G
Vithal, M
Issue Date: Oct-2009
Publisher: CSIR
Abstract: NaAlSb(PO<sub>4</sub>)<sub>3</sub> and HAlSb(PO<sub>4</sub>)<sub>3</sub> are prepared by solid-state and metathesis reactions respectively. They are characterized by powder XRD, IR and solid-state <sup>31</sup>P-MAS NMR spectroscopy. These two compounds crystallize in the hexagonal NASICON structure with the space group of <i>R</i><img src='/image/spc_char/3_bar.gif'><i>C</i>. Their infrared spectra exhibit characteristic vibrational bands of PO<sub>4</sub> tetrahedra. The <sup>31</sup>P-MAS NMR spectra of NaAlSb(PO<sub>4</sub>)<sub>3</sub> and HAlSb(PO<sub>4</sub>)<sub>3</sub> are characterized by a symmetric single peak around 9 ppm suggesting only one <b style=""></b>type of phosphorous in the hexagonal lattice. The activation energies for conduction and relaxation are more for NaAlSb(PO<sub>4</sub>)<sub>3</sub> compared to the values of HAlSb(PO<sub>4</sub>)<sub>3</sub>. The isothermal conductivity of NaAlSb(PO<sub>4</sub>)<sub>3 </sub>i s higher than the conductivity of HAlSb(PO<sub>4</sub>)<sub>3</sub>. The imaginary parts of the impedance, (<i>Z''</i>) and electric modulus (<i>M''</i>) against log frequency show single peaks in both <i>Z''</i>  and <i>M''</i> spectra.
Description: 347-354
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.16(5) [October 2009]

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