Abstract

Xonotlite (Ca 6Si 6O 17(OH) 2) nanobelts were synthesized by a microwave-assisted hydrothermal method at 180 °C for 90 min independent of the feeding molar ratio of Ca(NO 3) 2·4H 2O to Na 2SiO 3·9H 2O in the range of 0.8–3.0. Crystalline wollastonite (β-CaSiO 3) nanobelts were obtained by microwave thermal transformation of Ca 6Si 6O 17(OH) 2 nanobelts at 800 °C for 2 h. Ca 6Si 6O 17(OH) 2 nanobelts were used as both the precursor and the template for the preparation of β-CaSiO 3 nanobelts. The morphology and size of Ca 6Si 6O 17(OH) 2 nanobelts could be well preserved during the microwave thermal transformation process. The products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and selected area electron diffraction (SAED).

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