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

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 Li0.2K0.8–yMg1–xSc(Lu)1 + x(MoO4)3 (0 ≤ х ≤ 0.5; 0 ≤ y ≤ 0.3) with a NASICON structure (space group R3¯c\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\bar 3c$$\end{document}) 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.