KLiSiF6 and CsLiSiF6 - A Structure Investigation

KLiSiF6 and CsLiSiF6 were synthesized via a high-pressure/high-temperature synthesis route. Even though, both substances crystallize in the orthorhombic crystal system with space group Pbcn (no. 60), they show different crystal structures. Main motifs of KLiSiF6 are an [SiF6](2-) and an [LiF6](5-) unit. In contrast, the main motifs of CsLiSiF6 are an [SiF6](2-) and an [LiF5](4-) entity. Within both substances, these units are interconnected and form 3-dimensional networks. The substances were characterized via single-crystal and powder X-ray diffraction, as well as infrared spectroscopy and EDX measurements. Additionally, Mn4+-doped KLiSiF6 was analyzed by means of luminescence spectroscopy. It displays line emission in the red spectral region. The maximum emission wavelength is lambda(max)=631 nm.

Automated summary

In this study, KLiSiF6 and CsLiSiF6 were synthesized via a high-pressure/high-temperature synthesis route, exhibiting similar crystalline structures but distinct main motifs. Characterization was achieved through single-crystal and powder X-ray diffraction, infrared spectroscopy, and EDX measurements. Luminescence spectroscopy revealed line emission in the red spectral region for Mn4+-doped KLiSiF6, with a maximum emission wavelength of 631 nm.