Thermal conductivity and electrical transport properties of double-A-layer MAX phase Mo2Ga2C

Abstract

The present study reports the thermal conductivity and electrical transport properties of Mo2Ga2C, which is the first member of double-A-layer MAX phases. Dense bulk samples of Mo2Ga2C were prepared by vacuum hot pressing. At room temperature, the thermal conductivity was measured to be 14.8 ± 1.0 W/(m·K) and the electrical resistivity was 0.525 ± 0.052 µΩ·m. Mo2Ga2C follows the Wiedemann-Franz law and the Lorenz number is 2.22×10−8 WΩK−2. Mo2Ga2C is a superconductor with a transition temperature of ca. 5.1 K (±0.1%). The thermal conductivity and electrical resistivity are lower than those of most MAX phases probably due to the extra Ga layer.

Keywords

• max phases
• mo2ga2c
• superconductivity
• electrical transport
• thermal conductivity