Phase Relations in the Li2O-V2O3-V2O5 System at 700 C: Correlations with Magnetic Defect Concentration in Heavy Fermion LiV2O4

TL;DR

This study investigates the phase relations in the Li2O-V2O3-V2O5 system at 700°C and how they influence magnetic defect concentrations in LiV2O4, revealing synthesis conditions for varying defect levels and proposing a model for their correlation.

Contribution

It provides detailed phase diagrams and synthesis conditions for controlling magnetic defect concentrations in LiV2O4, linking phase relations to magnetic properties.

Findings

High magnetic defect concentrations are achieved with V2O3, Li3VO4, or LiVO2.

Low defect concentrations occur with V3O5.

A correlation model explains defect concentration variations.

Abstract

The phase relations in the Li2O-V2O3-V2O5 ternary system at 700 C for compositions in equilibrium with LiV2O4 are reported. This study clarified the synthesis conditions under which low and high magnetic defect concentrations can be obtained within the spinel structure of LiV2O4. We confirmed that the LiV2O4 phase can be obtained containing low (0.006 mol%) to high (0.83 mol%) magnetic defect concentrations n{defect} and with consistently high magnetic defect spin S values between 3 and 6.5. The high n{defect} values were obtained in the LiV2O4 phase in equilibrium with V2O3, Li3VO4, or LiVO2 and the low values in the LiV2O4 phase in equilibrium with V3O5. A model is suggested to explain this correlation.