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Synthesis of Zn‐doped talc in hydrothermal atmosphere
Author(s) -
Catalano M.,
Belluso E.,
Miriello D.,
Barrese E.,
Bloise A.
Publication year - 2014
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201300290
Subject(s) - talc , crystallinity , thermogravimetric analysis , differential scanning calorimetry , scanning electron microscope , zinc , dopant , hydrothermal circulation , fourier transform infrared spectroscopy , materials science , lattice constant , mineralogy , doping , differential thermal analysis , analytical chemistry (journal) , chemical engineering , nuclear chemistry , chemistry , metallurgy , diffraction , organic chemistry , composite material , physics , optoelectronics , optics , engineering , thermodynamics
Zn‐doped talc were synthesized under hydrothermal conditions at constant reaction time and pressure of 160 hours and 2 kbar respectively, at three different temperatures (300, 500 and 650 °C) with pH‐values of 5 and 7. The starting materials and run products were characterized by X‐ray powder diffraction (XRPD), scanning electron microscopy with annexed energy‐dispersive spectrometry (SEM‐EDS), differential scanning calorimetry thermogravimetric analysis (DSC‐TG) and Fourier transform infrared (FT‐IR). The results showed that the temperature, pH‐value of the reaction mixture and amount of zinc in the starting mixture affected the growth of the Zn‐doped talc. When synthesized at low temperature talc presents low crystallinity, flawed morphology but higher content in zinc in its lattice. A thermal treatment at, or above 500 °C allowed a significant flaw reduction in talc morphology, a higher crystallinity and a lower content in dopant. When large amounts of Zn were present in the starting mixtures, Zn‐doped talc grew small in size and poorly shaped. The effect of Zn doping on some chemical/physical characteristics of the synthesized talc was also discussed.