During systematic research on the mineral-related synthetic arsenates, with particular focus on their structural and spectroscopic classification, three new Sr-containing arsenates Sr2Mg(AsO4)2 · 2H2O (1), Sr2Zn4(AsO4)4·H2O (2) and Sr2Cu7(AsO4)6 (3) have been synthesized under low-temperature hydrothermal conditions in the system SrO−MO−As2O5−H2O (M2+ = Mg, Zn, Cu). Their crystal structures were determined using room-temperature single-crystal X-ray diffraction data and refined to the following R-values: 1– R1 = 0.025; 2– R1 = 0.030; 3– R1 = 0.035. Compounds 1 and 2 are structural analogues of two different arsenate minerals: 1 is the Sr analogue of talmessite, Ca2Mg(AsO4)2 · 2H2O, and 2 is the Sr analogue of prosperite, Ca2Zn4(AsO4)4 · H2O. Compound 1 is the first synthetic compound incorporating kröhnkite-type chains where a divalent cation occupies the interstitial A position (A2M(XO4)2 · 2H2O, A = Ca2+, Na+; M = Mg2+, Fe2+, Mn2+, Co2+, Ni2+, Cu2+; X = P5+, As5+, S6+). Compound 3 represents the second structurally characterized phase in the ternary SrO−CuO−As2O5 system besides SrCuAs2O7. The investigation showed that it is isotypic with Pb2Cu7(AsO4)6 and Ba2Cu7(AsO4)6. The CuOx (x = 4, 5, 6) polyhedra in 3 and in Pb and Ba analogues show a wide range of coordination geometries. This article focuses on the similarities and differences in their crystal structures and topology.
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Research Article|
July 01, 2018
Three new Sr-bearing arsenates, hydrothermally synthesized in the system SrO–MO–As2O5–H2O (M2+ = Mg, Cu, Zn) Available to Purchase
Tamara Đorđević;
1
Institut für Mineralogie und Kristallographie, Universität Wien
, Althanstrasse 14, 1090Wien, Austria
Corresponding author, e-mail: [email protected]
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Ljiljana Karanović
Ljiljana Karanović
2
Laboratory of Crystallography, Faculty of Mining and Geology
, Đušina 7, 11000Belgrade, Serbia
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1
Institut für Mineralogie und Kristallographie, Universität Wien
, Althanstrasse 14, 1090Wien, Austria
Ljiljana Karanović
2
Laboratory of Crystallography, Faculty of Mining and Geology
, Đušina 7, 11000Belgrade, Serbia
Corresponding author, e-mail: [email protected]
Publisher: Deutsche Mineralogische Gesellschaft, Sociedad Española de Mineralogia, Societá Italiana di Mineralogia e Petrologia, Société Francaise de Minéralogie
Received:
29 Jun 2017
Revision Received:
11 Aug 2017
Accepted:
30 Aug 2017
First Online:
04 May 2018
Online ISSN: 1617-4011
Print ISSN: 0935-1221
© 2018 E. Schweizerbart'sche Verlagsbuchhandlung, D-70176 Stuttgart
European Journal of Mineralogy (2018) 30 (4): 785–800.
Article history
Received:
29 Jun 2017
Revision Received:
11 Aug 2017
Accepted:
30 Aug 2017
First Online:
04 May 2018
Citation
Tamara Đorđević, Ljiljana Karanović; Three new Sr-bearing arsenates, hydrothermally synthesized in the system SrO–MO–As2O5–H2O (M2+ = Mg, Cu, Zn). European Journal of Mineralogy 2018;; 30 (4): 785–800. doi: https://doi.org/10.1127/ejm/2018/0030-2749
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Index Terms/Descriptors
- alkaline earth metals
- arsenates
- cations
- cell dimensions
- classification
- coordination
- crystal chemistry
- crystal structure
- hydrothermal conditions
- metals
- new minerals
- Raman spectra
- refinement
- spectra
- strontium
- sulfates
- synthetic materials
- topology
- unit cell
- valency
- X-ray diffraction data
- krohnkite
- talmessite
- prosperite
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