Vibrational spectra and electrophysical properties of a NASICON phase of variable composition Na1-xCo1-xSc1+x(MoO4)3 (0 ≤ x ≤ 0.5)

Subsolidus phase ratios of the Na2MoO4-CoMoO4-Sc-2(MoO4)(3) system have been studied by X-ray diffraction, differential thermal analysis, and vibrational spectroscopy. A phase of variable composition Na1 - x Co1 - x Sc1 + x (MoO4)(3), 0 a parts per thousand currency sign x a parts per thousand currency sign 0.5 having NASICON structure (space group ) and triple molybdate NaCo3Sc(MoO4)(5) crystallizing in triclinic system (space group ) have been obtained. The high conductivity of Na1 - x Co1 - x Sc1 + x (MoO4)(3) allows the phase of variable composition to be regarded as a promising sodium-ion conducting solid electrolyte.