Semi sol–gel synthesis, conductivity and luminescence studies of Ca0.5Fe1 − xEuxSb(PO4)3 (x = 0.1, 0.15 and 0.2)

Rare earth (Eu3+) doped Nasicon type compositions, Ca0.5Fe1 − xEuxSb(PO4)3 (x = 0.1, 0.15 and 0.2) were synthesized by semi sol–gel method and characterized by powder X-ray diffraction. All the three compositions were crystallized in hexagonal lattice with space group R3­. The time independent (DC) conductivity measurements were carried out in the temperature range 300–623 K. The activation energies for conduction were deduced from the Arrhenius plots. The luminescence properties and local structure of Eu3+ doped Nasicons were investigated by means of emission spectra and phonon sidebands.