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Minerals 2017, 7(8), 133; doi:10.3390/min7080133

Fabrication of Single-Crystalline Calcite Needle-Like Particles Using the Aragonite–Calcite Phase Transition

Shiraishi Central Laboratories Co. Ltd., 4-78 Motohama-cho, Amagasaki, Hyogo 660-0085, Japan
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Received: 24 July 2017 / Revised: 28 July 2017 / Accepted: 30 July 2017 / Published: 1 August 2017
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Abstract

Calcium carbonate (CaCO3) occurs in two major polymorphs: rhombohedral calcite and orthorhombic aragonite, the latter is thermodynamically metastable. In this study, we first prepared aragonite needle-like particles by introducing CO2-containing gas into Ca(OH)2 aqueous slurry. Then, the resulted aragonite particles were heat treated at 500 °C for 1 h, in order to induce the aragonite–calcite phase transition. Particle structures before and after the heat treatment were characterized mainly by powder X-ray diffractometry (XRD), field emission-scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). We found that single-crystalline calcite needle-like particles with zigzag surface structures can be fabricated using the phase transition. View Full-Text
Keywords: calcium carbonate; phase transition; calcite; needle-like particle; transmission electron microscopy (TEM) calcium carbonate; phase transition; calcite; needle-like particle; transmission electron microscopy (TEM)
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Kezuka, Y.; Kawai, K.; Eguchi, K.; Tajika, M. Fabrication of Single-Crystalline Calcite Needle-Like Particles Using the Aragonite–Calcite Phase Transition. Minerals 2017, 7, 133.

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