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Transition metals in micas: synthesis and characterization of Co-rich Cs-tainiolite

Title data

Koch, Sebastian G. ; Breu, Josef:
Transition metals in micas: synthesis and characterization of Co-rich Cs-tainiolite.
In: European Journal of Mineralogy. Vol. 25 (1 June 2013) Issue 3 . - pp. 487-494.
ISSN 1617-4011
DOI: https://doi.org/10.1127/0935-1221/2013/0025-2297

Abstract in another language

Transition-metal rich micas offer interesting properties with regard to magnetism and electric conductivity and moreover allow for a post-synthesis modification of the layer charge by oxidation which makes them interesting for a variety of applications. In this line, a Co and F-rich Cs-mica analogue of tainiolite, Cs(Co2 2+Li)Si4O10F2, was synthesized by high-temperature melt synthesis. Subsequent annealing for 10 days yielded an almost pure, coarse-grained material. Single-crystal X-ray diffraction studies of the Cotainiolite showed the structure to be of the 1M polytype (C2/m(No.12) with cell parameters of a = 5.3051(11) Å, b = 9.1710(18) Å, c = 10.897(2) Å, β = 99.40(5)°, V = 523.05(18) Å 3. Characteristic geometric parameters were compared to the analogous Mn-rich and Fe-rich compounds. All three compounds are outside the compositional stability limits. Mn-rich Cs-tainiolite, as expected, possesses the smallest octahedral flattening angle, but this value then stays almost constant for Fe- and Co-rich tainiolite although the ionic radius steadily decreases going from Mn2+ over Fe2+, to the smallest Co2+. Rather, the individual octahedral distortions do not show the expected behaviour. Moreover, significant differences between the apical (1.607Å) and basal (1.658Å) bond lengths may be regarded as the main adjustments mechanism.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: co-cs-tainiolite (synthetic); crystal structure; mica; synthetic clays; tainiolite
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry I > Chair Anorganic Chemistry I - Univ.-Prof. Dr. Josef Breu
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie > SFB 840 - TP A 6
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry I
Research Institutions
Research Institutions > Collaborative Research Centers, Research Unit
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 21 Mar 2018 11:50
Last Modified: 23 Mar 2018 08:15
URI: https://eref.uni-bayreuth.de/id/eprint/9364