Electrical properties and conduction mechanism of the NaMg4(PO4)3 compound

The NaMg4(PO4)3 phosphor was prepared by the conventional high-temperature solid-state reaction. The phase formation of the compound was confirmed by the powder X-ray diffraction. Electrical properties of the compound have been studied using complex impedance spectroscopy in the frequency range 209 Hz–1 MHz and temperature range 648–712 K. The AC conductivity for grain contribution was interpreted using the universal Jonscher’s power law. The temperature dependence of frequency exponent s was investigated to understand the conduction mechanism in NaMg4(PO4)3 compound. The non-overlapping small polaron tunneling model can explain the temperature dependence of the frequency exponent, and it was a closely good model to describe the dominant conduction mechanism.