High-pressure behavior and stability of synthetic buetschliite K2Ca(CO3)2 up to 19 GPa and 300°C

IF 2.4 3区 化学 Q2 SPECTROSCOPY Journal of Raman Spectroscopy Pub Date : 2024-01-10 DOI:10.1002/jrs.6654
Anna Yu Likhacheva, Sofija Miloš, Alexandr V. Romanenko, Sergey V. Goryainov, Anna I. Semerikova, Sergey V. Rashchenko, Ronald Miletich, Anton Shatsky
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Abstract

The occurrence of buetschliite, K2Ca(CO3)2, as inclusions in mantle minerals, is considered as one of the keys to understanding phase relationships of dense carbonates and outlines the potential role of potassium carbonates in the Earth's deep carbon cycle. Within this scope, the high-pressure behavior of synthetic buetschliite is characterized by in situ Raman spectroscopy up to 19 GPa and 300°C. Up to 6 GPa, the compression is regular, then the splitting of some of the lattice and internal modes defines the transition to a low-symmetry phase, in analogy to that observed previously in K2Mg(CO3)2. The temperature rise to 300°C shifts the transition pressure from ~6 to ~8 GPa, but on the whole, it does not change the high-pressure behavior of K2Ca(CO3)2. The observed pressure-induced spectral changes are fully reversible at room and elevated temperature. The findings show the expansion of buetschliite baric stability with temperature, which confirms its importance as a constituent of carbonate inclusions in deep minerals.

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合成布氏体 K2Ca(CO3)2 在 19 GPa 和 300°C 下的高压行为和稳定性
作为地幔矿物中的包裹体出现的布氏石(K2Ca(CO3)2)被认为是了解致密碳酸盐相关系的关键之一,并勾勒出钾碳酸盐在地球深层碳循环中的潜在作用。在此范围内,通过原位拉曼光谱对合成布氏碳酸盐在 19 GPa 和 300°C 下的高压行为进行了表征。在 6 GPa 以下,压缩是有规律的,然后一些晶格和内部模式的分裂决定了向低对称相的过渡,这与之前在 K2Mg(CO3)2 中观察到的情况类似。温度升高到 300°C 时,过渡压力从 ~6 GPa 上升到 ~8 GPa,但总体上并没有改变 K2Ca(CO3)2 的高压行为。观察到的压力引起的光谱变化在室温和高温下是完全可逆的。研究结果表明,随着温度的升高,布氏钠盐的巴氏稳定性也在增强,这证实了布氏钠盐作为深部矿物中碳酸盐包裹体成分的重要性。
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来源期刊
CiteScore
5.40
自引率
8.00%
发文量
185
审稿时长
3.0 months
期刊介绍: The Journal of Raman Spectroscopy is an international journal dedicated to the publication of original research at the cutting edge of all areas of science and technology related to Raman spectroscopy. The journal seeks to be the central forum for documenting the evolution of the broadly-defined field of Raman spectroscopy that includes an increasing number of rapidly developing techniques and an ever-widening array of interdisciplinary applications. Such topics include time-resolved, coherent and non-linear Raman spectroscopies, nanostructure-based surface-enhanced and tip-enhanced Raman spectroscopies of molecules, resonance Raman to investigate the structure-function relationships and dynamics of biological molecules, linear and nonlinear Raman imaging and microscopy, biomedical applications of Raman, theoretical formalism and advances in quantum computational methodology of all forms of Raman scattering, Raman spectroscopy in archaeology and art, advances in remote Raman sensing and industrial applications, and Raman optical activity of all classes of chiral molecules.
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