Abstract
Single crystals of norsethite-type carbonate BaMn(CO3)2 up to 200 μm in size were synthesized in a closed cavity under high pressure–temperature (P–T) conditions. Electron microprobe analyses revealed the composition of 49.00–49.09 wt% BaO and 22.66–22.74 wt% MnO, which correspond well to the ideal formula of Ba1.0Mn1.0(CO3)2. Accurate crystalline structural data were determined from single crystal X-ray diffraction (XRD). The \(R\overline{3} c\) space-group with a doubled c-axis and \(R\overline{3} m\) space-group were used to refine the crystal structure of BaMn(CO3)2. It is proved that \(R\overline{3} m\) is the most probable space-group for the BaMn(CO3)2 crystal structure because no superstructure reflections were observed in the X-ray images. The unit cell parameters were identified to be a = 5.0827(2) Å and c = 17.2797(10) Å in the rhombohedral symmetry of the \(R\overline{3} m\) space-group with a final R-value of 0.0184. High-pressure Raman spectroscopy was performed up to 10 GPa at room temperature, and Raman band shifts (\(\frac{{{\text{d}}\nu_{i} }}{{{\text{d}}P}}\)) were quantified. Each Raman vibration underwent resolvable splitting and the corresponding \(\frac{{{\text{d}}\nu_{i} }}{{{\text{d}}P}}\) showed a pronounced jump as the pressure reached 3.8 GPa arising from a pressure-induced transition.
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Acknowledgements
We appreciate Herta Effenberger and other two anonymous reviewers for their valuable comments and suggestions, which are important to greatly improve the manuscript quality. We also acknowledge Jung-Fu Lin from University of Texas at Austin for constructive discussion in carbonates minerals. This work was financially supported by Major State Research Development Program of China (2016YFC0601101), the National Science Foundation for Young Scientists of China (41802044), the Strategic Priority Research Program (B) of Chinese Academy of Sciences (XDB 18010401), 135 Program of the Institute of Geochemistry (Y2ZZ041000), CAS, and the Western Light (Y8CR028).
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Liang, W., Li, L., Yin, Y. et al. Crystal structure of norsethite-type BaMn(CO3)2 and its pressure-induced transition investigated by Raman spectroscopy. Phys Chem Minerals 46, 771–781 (2019). https://doi.org/10.1007/s00269-019-01038-w
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DOI: https://doi.org/10.1007/s00269-019-01038-w