RT Journal Article
T1 Characterization of vaterite synthesized at various temperatures and stirring velocities without use of additives
A1 Sevcik, Radek
A1 Pérez Estébanez, Marta
A1 Viani, Alberto
A1 Sasek, Petr
A1 Mäcová, Petra
AB Conditions for the synthesis of vaterite without additives have been investigated (T = 30 – 90°C, stirring velocity=200–600rpm). The obtained different CaCO3  polymorphs were characterized with Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRPD) and scanning electron microscopy (SEM). Quantitative phase analysis (QPA) was performed by the Rietveld method. To describe vaterite diffraction patterns, two structural models were employed. Their relative abundance was found to change with the temperature of synthesis. The optimal synthesis conditions for preparing pure vaterite (≥99 wt.%) were found at 60°C and 600 rpm. This is the first time pure vaterite is obtained at such high temperature without additives. The conditions under which the different polymorphs formed, and their microstructural features, are discussed. In addition, nanoindentation measurements on synthesized vaterite and calcite are firstly reported. The vaterite elastic modulus is higher than that of calcite (E = 16–48 GPa and E = 9–35 GPa, respectively), whereas the range in hardness was found to be the same for both polymorphs (H=0.4–2.8).
PB Elsevier
SN 0032-5910
YR 2015
FD 2015
LK https://hdl.handle.net/20.500.14352/99681
UL https://hdl.handle.net/20.500.14352/99681
LA eng
NO Ševčík, Radek, et al. «Characterization of Vaterite Synthesized at Various Temperatures and Stirring Velocities without Use of Additives». Powder Technology, vol. 284, noviembre de 2015, pp. 265-71. https://doi.org/10.1016/j.powtec.2015.06.064.
NO Ministry of Education, Youth and Sports (Czec Republic)
DS Docta Complutense
RD 16 abr 2025