The multiple structures of vaterite
MetadataShow full item record
For many years the nature of the disordered structure of vaterite, a calcium carbonate polymorph that plays a significant role in biomineralisation, has been debated. In the past year, two independent studies (Angew. Chem., Int. Ed., 51, 7041; CrystEngComm, 14, 44) have proposed new, yet different models on the basis of electron diffraction experiments and ab initio calculations, respectively. Here, it is shown that there are at least three effectively isoenergetic models that are equally likely to describe the vaterite structure at room temperature. These distinct models, each consisting of multiple structures, can explain the disorder of vaterite in terms of different orientations of the carbonate anions, multiple stacking sequences of the carbonate layers, and possible chiral forms. Hence, vaterite is not a single "disordered" structure but should instead be considered as a combination of different forms, each of which can exhibit rapid interchange between multiple structures that exhibit similar average properties.
Showing items related by title, author, creator and subject.
Oxygen Spectroscopy and Polarization-Dependent Imaging Contrast (PIC)-Mapping of Calcium Carbonate Minerals and BiomineralsDeVol, R.; Metzler, R.; Kabalah-Amitai, L.; Pokroy, B.; Politi, Y.; Gal, A.; Addadi, L.; Weiner, S.; Fernandez-Martinez, A.; Demichelis, Raffaella; Gale, Julian; Ihli, J.; Meldrum, F.; Blonsky, A.; Killian, C.; Salling, C.; Young, A.; Marcus, M.; Scholl, A.; Scholl, A.; Doran, A.; Jenkins, C.; Jenkins, C.; Bechtel, H.; Gilbert, P. (2014)X-ray absorption near-edge structure (XANES) spectroscopy and spectromicroscopy have been extensively used to characterize biominerals. Using either Ca or C spectra, unique information has been obtained regarding amorphous ...
Investigating vaterite phase stabilisation by a tetrazole molecule during calcium carbonate crystallisationMassi, Max; Ogden, Mark; Jones, Franca (2012)Tetrazole compounds have recently been found to impact on crystal morphology but in a manner different from that of carboxylate molecules. One such molecule was found to stabilise vaterite and this was investigated by ...
Probing the Multiple Structures of Vaterite through Combined Computational and Experimental Raman SpectroscopyDe La Pierre, Marco; Demichelis, Raffaella; Wehrmeister, U.; Jacob, D.; Raiteri, Paolo; Gale, Julian; Orlando, R. (2014)First-principles Raman spectra have been computed for several new vaterite structural models that have been recently proposed, and compared with spectra recorded on a set of biogenic, geological and synthetic samples. ...