Proto-Calcite and Proto-Vaterite in Amorphous Calcium Carbonates (pages 8889–8891)
Dr. Denis Gebauer, Dr. Philips N. Gunawidjaja, Dr. J. Y. Peter Ko, Dr. Zoltán Bacsik, Baroz Aziz, Lijia Liu, Dr. Yongfeng Hu, Prof. Lennart Bergström, Dr. Cheuk-Wai Tai, Prof. Tsun-Kong Sham, Dr. Mattias Edén and Dr. Niklas Hedin
Article first published online: 14 OCT 2010 | DOI: 10.1002/anie.201003220
Amorphous order: Amorphous calcium carbonates (ACC) have an intrinsic structure relating to the crystalline polymorphs of calcite and vaterite. The proto-crystalline structures of calcite and vaterite (pc-ACC and pv-ACC) are analyzed by NMR (see picture), IR, and EXAFS spectroscopy, which shows that the structuring of ACC relates to the underlying pH-dependent equilibria.