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The crystal structure of Pd8As3, a synthetic analogue of stillwaterite

Published online by Cambridge University Press:  01 July 2022

Oxana V. Karimova*
Affiliation:
Institute of Geology of Ore Deposits RAS, Staromonetny 35, Moscow, 117019, Russia
Anna A. Mezhueva
Affiliation:
Institute of Geology of Ore Deposits RAS, Staromonetny 35, Moscow, 117019, Russia
Nikolay A. Zgurskiy
Affiliation:
State University “Dubna”, Universitetskaja 19, Dubna, 141980, Russia
Andrey A. Zolotarev
Affiliation:
Institute of Earth Sciences, State University of Saint-Petersburg, University Emb. 7/9, Saint-Petersburg, 199034, Russia
Dmitriy A. Chareev
Affiliation:
State University “Dubna”, Universitetskaja 19, Dubna, 141980, Russia Institute of Experimental Mineralogy RAS, Chernogolovka, Moscow District, 142432, Russia Ural Federal University, Ekaterinburg, 620002, Russia Kazan Federal University, Kazan, 420008, Russia
*
*Author for correspondence: Oxana V. Karimova, Email: oxana.karimova@gmail.com

Abstract

The synthetic analogue of mineral stillwaterite, Pd8As3, was synthesised and its crystal structure was solved to R1 = 0.0341 based on single crystal X-ray diffraction data. Pd8As3 is trigonal and the space group is P$\bar{3}$. The unit-cell parameters are a = 7.4261(4), c = 10.3097(9) Å and V = 492.38(7) Å3 with Z = 3. The structure builds up by layers of Pd and As atoms. Pd-nets and As-nets are parallel to (110) and stack along the c axis direction. The stacking sequence is ABCDEEDCBA. The relation between structures of minerals with the common formula Pd8T3 (T = As or/and Sb) are discussed. They are formed by nets of pnictogen and palladium atoms. The common feature of the structures is 36 topology of pnictogen nets. The differences are stacking sequences and topology of the palladium nets.

Type
Article
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

Associate Editor: František Laufek

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