STRUCTURAL-CHANGE IN LI-1-XVO2 (X-APPROXIMATE-TO-0.2) SINGLE-CRYSTALS

The phase transition around 500 K of Li0.8VO2 has been studi{dotless}́ed using single-crystal specimens grown by the flux method. Single-crystal X-ray diffraction reveals that the marked superstructure streaks elongated in the <00 · 1> direction at room temperature disappear on heating above 500 K, and that the structure becomes an ideal “ordered rock salt” type of α-NaFeO2. The phase change occurs reversibly during heating and cooling cycles. Partial decomposition into a spinel phase is also observed. © 1993 Academic Press, Inc.