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Synthesis and properties of phosphate cancrinite (PO 4 ‐CAN) a synthetic counterpart of depmeierite
Author(s) -
Buhl J.Ch.,
Petrov V.
Publication year - 2021
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.202100160
Subject(s) - fourier transform infrared spectroscopy , magic angle spinning , nepheline , infrared spectroscopy , nuclear chemistry , thermogravimetry , analytical chemistry (journal) , spectroscopy , phosphate , chemistry , magic angle , mineralogy , materials science , crystallography , nuclear magnetic resonance spectroscopy , inorganic chemistry , stereochemistry , chemical engineering , organic chemistry , physics , quantum mechanics , engineering
Phosphate cancrinite (PO 4 ‐CAN) has been synthesized under mild hydrothermal conditions at 473 K using kaolin, sodium orthophosphate‐dodecahydrate and strong alkaline conditions (8 M NaOH solution). Cancrinite crystals of rod‐like habit and maximum lengths up to 2 μm were observed and characterized by X‐ray powder diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X‐ray spectroscopy (EDXS) and Fourier transform infrared spectroscopy (FTIR). Magic angle spinning nuclear magnetic resonance spectroscopy (MAS NMR) of the nucleus 31 P, thermogravimetry (TG/DTG) and heating experiments under open conditions in a furnace were additionally performed. The empirical formula Na 8 [SiAlO 4 ] 6 (PO 4 ) 0.58 (CO 3 ) 0.13 (H 2 O) 4.6 was calculated from EDXS analyses and TG data under consideration of a minor carbonate content, detected by FTIR spectroscopy. PO 4 ‐CAN is stable up to 800 °C before thermal destruction rapidly occurs at 825 °C. The final product of TG analyses at 1000 °C is a mixture of a nepheline‐like phase and the phosphate content of the initial cancrinite sample. XRD and FTIR results of the synthesis product are in good agreement with literature data of the rare mineral depmeierite.