Add time:07/27/2019         Source:sciencedirect.com

The low frequency vibrational spectra (Raman and IR) of crystalline metaborates Ba2MII(B3O6)2 (MII  Mg, Ca, Ni, Co, Cd) are interpreted on the basis of a factor group analysis and with the help of 24Mg26Mg and 40Ca44Ca isotopic shifts. The far-IR spectra of the glasses appear as the envelope of the spectra of the corresponding crystalline compounds for MII  Mg, Ca and Cd, but they exhibit an additional broad absorption centred near 400 cm−1 for MII  Co, Ni and Zn. This absorption is assigned to a fourfold coordination of part of the MII cations, the remaining being in sixfold coordination (as in the crystal) and responsible for a broad absorption in the 300-200 cm−1 region. The possible existence of correlations between coordination and vibrational frequencies is discussed for either alkali and alkaline-earth cations, or transition elements.

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