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Synthesis, Structure, and Electric Conductivity of Ferrous Tainiolite and its Oxidative Conversion into Coarse-Grained Swellable Smectite

Title data

Mariychuk, Ruslan ; Baumgartner, Alexander ; Wagner, Friedrich E. ; Lerf, Anton ; Dubbe, Andreas ; Moos, Ralf ; Breu, Josef:
Synthesis, Structure, and Electric Conductivity of Ferrous Tainiolite and its Oxidative Conversion into Coarse-Grained Swellable Smectite.
In: Chemistry of Materials. Vol. 19 (2007) Issue 22 . - pp. 5377-5387.
ISSN 1520-5002
DOI: https://doi.org/10.1021/cm0713778

Official URL: Volltext

Project information

Project title:
Project's official titleProject's id
No informationBR1408/4
No informationBR1408/5

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Ferrous tainiolite, Cs[Fe2Li]o[Si4]tO10F2, has been synthesized from the melt in gastight molybdenum crucibles. The electric conductivity has been measured by impedance spectroscopy. As compared to natural micas, which are insulators, good conductivity is observed. The layered silicate can be further modified by ion exchange, which makes it a promising host structure for sensor materials. The estimated activation energy is as low as 0.79 eV. Upon Ba2+ exchange for Cs+, structural Fe2+ is partially oxidized (33%), and the layer charge is reduced significantly, resulting in a coarse-grained but swollen (monolayer hydrate) smectite-type layered silicate. Therefore, further functionalization by pillaring will be feasible resulting in a conducting microporous material. The new material has been characterized by the analysis of chemical composition (wavelength dispersive X-ray spectroscopy and laser ablation-inductively coupled plasma−mass spectrometry), differential thermal analysis, electron microscopy, Mössbauer, UV−vis/NIR, impedance spectroscopy, and single-crystal structure refinement (wR(F2) = 0.0883). The structure is of the 1M polytype (C2/m) with cell parameters a = 5.277(2) Å, b = 9.148(2) Å, c = 10.804(2) Å, and β = 99.19(3)°. The congruent melting point was observed at 1103 (±5) K.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Faculties
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 26 Jan 2015 08:14
Last Modified: 06 Apr 2016 07:31
URI: https://eref.uni-bayreuth.de/id/eprint/5991