Thermal conductivity of solidN2-Ar alloys

We report measurements of the thermal conductivity of hexagonal close-packed ${\mathrm{N}}_2$-Ar solid alloys. The measurements include the temperature and ${\mathrm{N}}_2$ concentration regime known as the quadrupolar glass phase. The thermal conductivity is comparable in magnitude to that of vitreous silica and, like other glasses, has a ‘‘plateau.’’ However, the low-temperature dependence of the thermal conductivity is greater than $T^2$.