Nasicon type compounds of general formula Ca0.5SbMP3O12 (M = Al, Fe, Cr) are prepared by solid-state method. All the compounds crystallize in hexagonal lattice with \( R \,\bar 3\,c \) space group. The IR spectra show characteristic PO4 vibrations. Conductivity studies indicate the presence of charged defects. The Cole-Cole plots of impedance are semicircles between 150 and 350 °C. The thermal expansion of these samples is studied in the temperature range 25–500 °C.
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The authors would like to thank Head, Department of Physics, Osmania University for extending powder XRD facility. The authors wish to thank Dr. J.A.R.P. Sarma for fruitful discussions. One of us (K.K.R) thanks CSIR, New Delhi for financial assistance.
Goodenough JB, Hong HYP, Kafalas JA (1976) Mater Res Bull 11:303Google Scholar