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Crystal structure and vibration spectra of norsethite-type BaMg(CO3)2–BaMn(CO3)2 solid solutions

Published online by Cambridge University Press:  27 January 2025

Wen Liang*
Affiliation:
College of Material Science and Engineering, Guizhou Minzu University, Guiyang, 550025, China Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China
Jie Bai
Affiliation:
Analysis and test center, Guangdong University of Technology, Guangzhou, 510075, China
Lin Li
Affiliation:
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China
Zengsheng Li
Affiliation:
Shandong Geological Sciences Institute, Jinan, 250013, China
Yong Meng
Affiliation:
College of Material Science and Engineering, Guizhou Minzu University, Guiyang, 550025, China Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China
Kaixiang Liu
Affiliation:
College of Material Science and Engineering, Guizhou Minzu University, Guiyang, 550025, China
Peer-Lennart Gehlken
Affiliation:
Raw Materials Analysis Ltd., D-37136 Ebergötzen, Germany
Michael E. Böttcher*
Affiliation:
Geochemistry & Isotope Biogeochemistry, Leibniz Institute for Baltic Sea Research (IOW), D-18119 Warnemünde, Germany Institute for Geography & Geology, University of Greifswald, D-17489 Greifswald, Germany; Interdisciplinary Faculty, University of Rostock, D-18059 Rostock, Germany
*
Corresponding authors: Michael E. Böttcher; Email: michael.boettcher@io-warne muende.de; Wen Liang; Email: liangwen.pku@163.com
Corresponding authors: Michael E. Böttcher; Email: michael.boettcher@io-warne muende.de; Wen Liang; Email: liangwen.pku@163.com

Abstract

Members of norsethite-type carbonate solid solutions with the compositions Ba(Mg1–xMnx)(CO3)2, (x = 0, 0.25, 0.50 and 0.75) have been synthesised under high-pressure and -temperature conditions (3GPa, 800°C) for the first time. The synthetic transparent crystals gradually changed their appearance from colourless to blue lustre with the increasing Mn2+ content (XMn). The results of the crystal structure analyses reveal that the lattice parameters (a, c, unit-cell volume, Mg/Mn–O bond lengths and Ba–O bond lengths) complied with a linear increase with XMn. In contrast, the C–O bond lengths and O–C–O bond angles decreased, because the CO32– group was squeezed by the expansion of the (Mg/Mn)O6 octahedra. Moreover, the Raman and infrared vibrations, except for the lattice mode T, shift to low frequency with the increasing XMn, and the slight corresponding variations of the atomic positions were also determined. These new results demonstrate the impact of Mg2+–Mn2+ substitution on the crystal chemistry of norsethite-type solid solutions, with further implications for the natural occurrence and environmental of norsethite-type and dolomite/ankerite-type carbonates.

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Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland.

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