Thermal conductivity, diffusivity and specific heat capacity of as-grown, degenerate single-crystalline ZnGa₂O₄

Abstract This work provides the first experimental determination of low-temperature thermal properties for novel highly pure single-crystalline ZnGa 2 O 4 . The temperature dependence conductivity, diffusivity and specific heat capacity as-grown, degenerated single crystals is measured using ω -method between T = 27 K room temperature. At D ≈ 6.9 · 10 −6 m s, conductivity λ 22.9 W mK −1 C V 537 J kgK increases with decreasing temperatures due to reduced phonon-phonon Umklapp scattering down 50 K. For lower limited by boundary scattering.