Threefold coordinated germanium in a GeO melt.

The local structure around germanium is a fundamental issue in material science and geochemistry. In the prevailing viewpoint, germanium in GeO melt is coordinated by at least four oxygen atoms. However, the viewpoint has been debated for decades due to several unexplained bands present in the GeO melt Raman spectra.

Quantitative Studies on Local Structure of Molten Binary Potassium Germanates.

high temperature Raman spectra of KO-(100-)GeO, samples containing 0, 5, 11.11, 20, 25, 33.3, 40, and 50 %mol KO, were measured.

Temperature-Dependent Raman Spectroscopic Study of the Double Molybdate KBi(MoO).

In situ high-temperature Raman spectra of polycrystalline KBi(MoO) were recorded from room temperature to 1073 K. Thermal stability of the monoclinic KBi(MoO) was examined by temperature-dependent XRD. The monoclinic phase transformed into the scheelite tetragonal structure at 833 K, and then to the monoclinic phase at 773 K.

In Situ Raman Spectroscopy and DFT Studies of the LiGeO Melt Structure.

Knowledge of the molecular-level structure of the LiGeO melt is essential to understand its basic physicochemical properties. In this work, in situ Raman spectroscopy, factor group analysis, and density functional theory (DFT) calculations were applied to investigate the LiGeO crystal Raman spectrum and its transformation during the crystal melting process. Finally, the LiGeO melt structure was determined.