Rare cyclosilicate odintsovite K2Na4Ca3Ti2Be4Si12O38: new crystal-chemical data

IF 1.4 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Ekaterina V. Kaneva, Alexander I. Bogdanov, Tatiana A. Radomskaya, Roman Y. Shendrik
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引用次数: 0

Abstract

The Murun massif (Aldan shield, Russia) is particularly intriguing due to its group of alkali Ca-(K)-(Na) silicates, which includes many new and rare species. Additionally, it is also of interest for its beryllium mineralization. One of the unique beryllium Ca-(K)-(Na) silicates, odintsovite K2Na4Ca3Ti2Be4Si12O38, was investigated in this study. The aim of this study is to provide new insights into the crystal chemistry and spectroscopic properties of odintsovite. DFT modelling was used to interpret the experimental IR and Raman spectra. Determining the crystal-chemical formula of odintsovite is challenging due to the presence of atoms in different structural positions with varying valence states. The distribution of cations was determined by combining electron probe microanalysis with the results of crystal structure refinement. Luminescence of Eu3+ was observed in odintsovite upon excitation at around 532 nm. Analysis of the luminescence band splitting is related to the 4f–4f transitions in Eu3+ ions. Additionally, upon excitation at around 370 nm, luminescence with a peak at around 410 nm, associated with 5d–4f transitions in Ce3+ ions, was observed.

Abstract Image

Abstract Image

稀有环硅酸盐奥丁sovite K2Na4Ca3Ti2Be4Si12O38:新的晶体化学数据
穆伦丘陵(俄罗斯阿尔丹地盾)因其碱 Ca-(K)-(Na)硅酸盐群而特别引人入胜,其中包括许多稀有的新物种。此外,它的铍矿化也令人感兴趣。本研究对独特的铍 Ca-(K)-(Na)硅酸盐之一,奥丁索维岩 K2Na4Ca3Ti2Be4Si12O38 进行了研究。本研究的目的是为奥丁皂石的晶体化学和光谱特性提供新的见解。DFT 模型用于解释实验红外光谱和拉曼光谱。由于不同结构位置的原子具有不同的价态,因此确定奥丁皂石的晶体化学式具有挑战性。通过将电子探针显微分析与晶体结构细化结果相结合,确定了阳离子的分布。在波长为 532 纳米左右的激发下,奥丁sovite 中的 Eu3+ 发出了荧光。发光带分裂分析与 Eu3+ 离子的 4f-4f 转变有关。此外,在 370 纳米左右的波长下激发时,也观察到了峰值在 410 纳米左右的发光,这与 Ce3+ 离子中的 5d-4f 转变有关。
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来源期刊
Mineralogy and Petrology
Mineralogy and Petrology 地学-地球化学与地球物理
CiteScore
2.60
自引率
0.00%
发文量
0
审稿时长
1 months
期刊介绍: Mineralogy and Petrology welcomes manuscripts from the classical fields of mineralogy, igneous and metamorphic petrology, geochemistry, crystallography, as well as their applications in academic experimentation and research, materials science and engineering, for technology, industry, environment, or society. The journal strongly promotes cross-fertilization among Earth-scientific and applied materials-oriented disciplines. Purely descriptive manuscripts on regional topics will not be considered. Mineralogy and Petrology was founded in 1872 by Gustav Tschermak as "Mineralogische und Petrographische Mittheilungen". It is one of Europe''s oldest geoscience journals. Former editors include outstanding names such as Gustav Tschermak, Friedrich Becke, Felix Machatschki, Josef Zemann, and Eugen F. Stumpfl.
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