Hydrothermal Synthesis and Dehydration of CaTeO3(H2O) : An Original Route to Generate New CaTeO3 Polymorphs
Hydrothermal synthesis of hydrated oxotellurate, CaTeO3(H2O), combined with dehydration reaction, is an original route to generate new CaTeO3 polymorphs. CaTeO3(H2O) presents a layered and non-centrosymmetric structure. The topotactic dehydration reaction above 120°C leads to a new non-centrosymmetric metastable d-CaTeO3 polymorph, which conserves a layered structure. These phases were further characterized using powder X-ray diffraction, DFT calculations, infrared spectroscopy, time-resolved second harmonic generation, and thermal analysis.
Corresponding author:Nicolas Barrier
Morgane Poupon, Nicolas Barrier, Sebastien Petit, Simon Clevers, and Valerie Dupray
Inorg. Chem., 2015, 54 (12), pp 5660–5670. DOI : 10.1021/acs.inorgchem.5b00037