Schwingungsspektren von komplexen Boraten.

Abstract

The aim of the investigations was the characterization of the polyborates, as far as IR-spectroscopy is concerned. The investigations covered the absorption spectra of different pentaborates, including those substituted by 10 B-, n B-, and H-D-isotopes, as well as the reflection spectra of potassium-pentaborate single crystals with polarized radiation. The concept of group frequency analysis was successfully applied to the interpretation of the pentaborate-spectra; almost all bands were attributed to vibrations of the B03 , B04 and OH units.

Multianvil high-pressure/high-temperature preparation, crystal structure, and properties of the new oxoborates Dy4B6O14(OH)2 and Ho4B6O14(OH)2

“…Both, the asymmetric and the symmetric absorptions exhibit shoulders, which can be attributed to two crystallographically distinguishable BO 4 -tetrahedra. The presence of hydrogen in these phases is verified by the observation of deformation modes d OH at 1328 cm À1 (Dy 4 B 6 O 14 (OH) 2 ) and 1335 cm À1 (Ho 4 B 6 O 14 (OH) 2 ), accompanied by n OH (3500-3000 cm À1 ), which are typical for hydroxyl groups in borates [39].…”