ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Thermal behavior of peroxydiphosphates. I. Sodium peroxydiphosphate and its hydrates

B. Maliňák and J. Kolářová

Institut für anorganische Chemie der Naturwissenschaftlichen Fakultät an der J. Ё. P urkyně-Universität, Brno

Abstract: The investigation of thermal properties of Na₄P₂0₈ and its hydrates by the method of derivation thermography proved that the DTA curve of these substances is characterized by the exothermic decomposition effect to split off active oxygen. In the case of Na₄P₂0₈, Na₄P₂0₈ • H₂0, Na₄P₂0₈ • 6H₂0 and Na₄P₂0₈ • 20H₂O the exothermic effect was found to have maximum at 300°C. By examination of the thermal decomposition of Na₄P₂0₈  • 20H₂O and Na₄P₂0 • 6H₂0 an existence of Na₄P₂0₈ • H₂0 was ascertained and the exact conditions of dehydration were determined. Thermal elimination of active oxygen from the monohydrate of the sodium peroxodiphosphate led to Na₄P₂0₇ • H₂0 which loses water at 490-500°C. The IR spectra of this substance let us suggest the molecule of water to be of crystalline character.

Full paper in Portable Document Format: 244a257.pdf (in German)

Chemical Papers 24 (4) 257–264 (1970)