Abstract
A pure hydrated potassium borate K 2B 5O 8(OH)·2H 2O has been synthesized under mild hydrothermal conditions and characterized by single-crystal X-ray diffraction, XRD, FT-IR, Raman spectra and DTA-TG. The crystal structure consists of two K–O polyhedra and [B 5O 8(OH)] 2− polyborate anion. The enthalpy of formation was determined to be −4772.6 ± 4.0 kJ mol −1 by solution calorimetry.
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