Growth and thermal properties of $SrWO4$ single crystal Available to Purchase

A strontium tungstate $(SrWO4)$ single crystal with dimensions of $Φ$ $25×40mm2$ has been grown by the Czochralski method using an iridium crucible. X-ray powder diffraction results show that as grown the $SrWO4$ crystal belongs to the tetragonal system in the scheelite structure. The effective segregation coefficients of elemental W and Sr in the crystal growth are measured by x-ray fluorescence, and the respective values are close to 1. The thermal properties of the $SrWO4$ crystal were systemically studied by measuring the thermal expansion, specific heat, and thermal diffusion coefficient. These results show that the crystal possesses a large anisotropic thermal expansion with thermal-expansion coefficients $αa=8.61×10−6∕K$⁠, $αb=8.74×10−6∕K$⁠, $αc=18.78×10−6∕K$ over the temperature range of $303.15–773.15K$⁠. The measured value of the specific heat is $0.30–0.34Jg−1K−1$ when the temperature is increased from $323.15to1073.15K$⁠. The thermal diffusion coefficient was measured over the temperature range of $303.15–543.15K$⁠. The thermal conductivities of the $SrWO4$ crystal along the [100] and [001] directions are calculated to be $3.1326Wm−1K−1$ and $2.9477Wm−1K−1$⁠, respectively, at $303.15K$⁠. Then the thermal properties of some other Raman crystals were compared with these data, and the thermal focal lengths for these crystals were also estimated.