Vibrational Spectra and Electrophysical Properties of Li0.2K0.8–yMg1–xSc(Lu)1 + x(MoO4)3 (0 ≤ х ≤ 0.5; 0 ≤ y ≤ 0.3) Solid Solutions with a NASICON Structure

Abstract

The phase relationships in the subsolidus region of the Li₂MoO₄–K₂MoO₄–MgMoO₄–Sc₂(MoO₄)₃–Lu₂(MoO₄)₃ system have been studied by X-ray crystallography and vibrational spectroscopy. A phase of variable composition Li_0.2K_0.8–yMg_1–xSc(Lu)_{1 + x}(MoO₄)₃ (0 ≤ х ≤ 0.5; 0 ≤ y ≤ 0.3) with a NASICON structure (space group R\(\bar 3c\)) was synthesized by the ceramic route. The phase exhibits high conductivity, which makes it a candidate for use as a solid electrolyte with lithium and potassium ion conductivity. The unit cell parameters were determined, and IR and Raman spectra were interpreted.