Perryite, (Ni,Fe)16PSi5, from the Mount Egerton aubrite: the first natural P-Si-ordered phosphide-silicide

IF 1.1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Journal of Geosciences Pub Date : 2021-12-29 DOI:10.3190/jgeosci.331

S. Britvin, S. Krivovichev, O. Vereshchagin, N. S. Vlasenko, V. Shilovskikh, M. Krzhizhanovskaya, M. S. Lozhkin, E. Obolonskaya, Yulia O. Kopylova

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引用次数: 1

Abstract

Perryite, natural Ni-silicide, is a minor but regular constituent of the metal phase in enstatite chondrite (aubrite) and enstatite chondrite meteorites. Its synthetic analog was shown to have promising catalytic properties. The first-time solution of the crystal structure of natural perryite was completed on the material from the Mount Egerton aubrite. The mineral is trigonal, R3̄c, a = 6.6525(5), c = 37.998(5) Å, V = 1456.3(3) and Z = 6. The structure was refined to R1 = 0.0137 based on 457 independent observed reflections. The chemical formula obtained from the structure refinement, (Ni14.14Fe1.88)Σ16.02PSi5, agrees with that derived from the electron microprobe data, (Ni13.39Fe2.65Co0.01)Σ16.05P1.22Si4.74. This research showed that P and Si in perryite are ordered, resulting in the simplified formula (Ni,Fe)16PSi8, in contrast to the currently accepted variant (Ni,Fe)8(Si,P)3. The detailed results of EBSD study reveal previously unknown relationships between perryite, associated α-(Fe,Ni) metal (also known as kamacite) and schreibersite, (Fe,Ni)3P. Since enstatitic meteorites represent the early stages of nebular accretion, our results demonstrate that the crystal-chemical factor could affect the differentiation of chemical elements upon the onset of the Solar System formation.

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(Ni,Fe)16PSi5橄榄石:第一个天然的p -si有序磷化硅化物

Perryite是一种天然的硅化镍，是顽火辉石球粒陨石（aubrite）和顽火辉石陨石中金属相的一种次要但规则的成分。其合成类似物被证明具有良好的催化性能。在埃格顿火山灰岩的材料上首次解决了天然绿柱石的晶体结构。该矿物是三角的，R3̄c，a=6.6525（5），c=37.998（5）Å，V=1456.3（3）和Z=6。基于457个独立观察到的反射，该结构被细化为R1=0.0137。通过结构细化得到的化学式（Ni14.14Fe1.88）∑16.02PSi5与电子探针数据得到的化学公式（Ni13.39Fe2.65Co0.01）∑16.05P1.22Si4.74一致。这项研究表明，与目前接受的变体（Ni，Fe）8（Si，P）3相比，钙钛矿中的P和Si是有序的，从而得到简化的公式（Ni，Fe）16PSi8。EBSD研究的详细结果揭示了以前未知的苝矿、伴生的α-（Fe，Ni）金属（也称为钾铝矿）和schreibersite（Fe，镍）3P之间的关系。由于顽火陨石代表了星云吸积的早期阶段，我们的研究结果表明，晶体化学因素可能会影响太阳系形成时化学元素的分化。

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来源期刊

Journal of Geosciences GEOSCIENCES, MULTIDISCIPLINARY-MINERALOGY

CiteScore

2.30

自引率

7.10%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of Geosciences is an international peer-reviewed journal published by the Czech Geological Society with support from the Czech Geological Survey. It accepts high-quality original research or review papers dealing with all aspects of the nature and origin of igneous and metamorphic rocks. The Journal focuses, mainly but not exclusively, on: -Process-oriented regional studies of igneous and metamorphic complexes- Research in structural geology and tectonics- Igneous and metamorphic petrology- Mineral chemistry and mineralogy- Major- and trace-element geochemistry, isotope geochemistry- Dating igneous activity and metamorphic events- Experimental petrology and mineralogy- Theoretical models of igneous and metamorphic processes- Mineralizing processes and mineral deposits. All the papers are written in English, even though they may be accompanied by an additional Czech abstract. Each contribution is a subject to peer review by at least two independent reviewers, typically at least one from abroad. The Journal appears 2 to 4 times a year. Formally it is divided in annual volumes, each of them including 4 issues.