A New Synthesis of BaHPO₄ Precipitated by BaCO₃-H₃PO₄-NaOH System at Room Temperature

Abstract

Barium hydrogenphosphate, BaHPO4 was synthesized for the first time through simple and rapid method using BaCO3-H3PO4-NaOH, pH =9.0 at room temperature for 30 min. The studied BaHPO4 decomposed in a single well-defined stage via deprotonated hydrogenphosphate reactions, revealed by TG/DTG and DSC techniques. The calculated wavenumbers based on DSC peak were comparable with FTIR results, which support the breaking bonds of P-OH (HPO42-) in the deprotonated hydrogenphosphate reactions. The thermodynamic functions (ΔH*, ΔG*, and ΔS*) for the deprotonated hydrogenphosphate reactions calculated from DSC data indicate that the deprotonated HPO42- reaction occur a lower-energy pathway and spontaneous process. The FTIR, XRD and SEM data of the studied BaHPO4 and its decomposed product Ba2P2O7 are also reported.

Microbiological Precipitation, Morphology and Thermal Behavior of Barium Hydrogen Phosphate

“…There are a lot of synthetic process to prepare barium hydrogen phosphate, including gel method [6], electrochemical technique [7], hydrothermal synthesis [8], and chemical precipitation using H 3 PO 4 or P 4 O 10 in the presence of a base [9][10][11]. From all these methods, the desired material can be obtained in single crystals and powder form in bulk.…”