Raman spectroscopic investigations of natural jennite from Maroldsweisach, Bavaria, Germany

Autor: Rupert Hochleitner, Dirk Müller, Karl Thomas Fehr

Publikováno v: Journal of Raman Spectroscopy. 47:602-606

A full-range pattern (100-3700 cm(-1)) analysis of natural jennitewas performed for the first time by Raman spectroscopy, applying a polarized laser at a wavelength of 532 nm. A prominent structural feature of jennite is the preferred orientation of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c4dd09ca98d946a457f91a6ee9b727f3
https://doi.org/10.1002/jrs.4865

Electrical properties and Mössbauer spectra of rutile-type Fe1−x Mn x TiTaO6 (0 ≤ x ≤ 0.3) ceramics

Autor: Karl Thomas Fehr, E. Schmidbauer, A. Günther, Rupert Hochleitner

Publikováno v: Journal of Electroceramics. 32:205-214

Several electrical quantities of rutile-type Fe1−x Mn x TiTaO6 (0 ≤ x ≤ 0.3) ceramics were measured between room temperature and ∼ 770 K. One aim of the investigation was to study differences to data known from rutile-type FeTiTaO6 ceramics,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d218f10dd6e0a6c6653a404cf66aaf9a
https://doi.org/10.1007/s10832-013-9874-0

In‐situ Synchrotron X‐ray Diffraction Study of the Formation of Cubic Li 2 TiO 3 Under Hydrothermal Conditions

Autor: Bo B. Iversen, Karl Thomas Fehr, Andreas Laumann, Michael Holzapfel, Kirsten M. Ø. Jensen, Martin Bremholm, Christoffer Tyrsted

Publikováno v: Laumann, A, Jensen, K M Ø, Tyrsted, C, Bremholm, M, Fehr, K T, Holzapfel, M & Iversen, B B 2011, ' In-situ Synchrotron X-ray Diffraction Study of the Formation of Cubic Li 2 TiO 3 Under Hydrothermal Conditions ', European Journal of Inorganic Chemistry, vol. 14, pp. 2221-2226 . https://doi.org/10.1002/ejic.201001133

Synchrotron powder X-ray diffraction (PXRD) has been used to study in-situ the hydrothermal intercalation of lithium ions in titania powder following the reaction TiO2 + 2 LiOH Li2TiO3 + H2O. Syntheses were performed in a sapphire capillary at temper

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2877bd2c05d3bb216141094833d70cf5
https://doi.org/10.1002/ejic.201001133

THE KECKITE PROBLEM AND ITS BEARING ON THE CRYSTAL CHEMISTRY OF THE JAHNSITE GROUP: MOSSBAUER AND ELECTRON-MICROPROBE STUDIES

Autor: Karl Thomas Fehr, Rupert Hochleitner

Publikováno v: The Canadian Mineralogist. 48:1445-1453

Keckite is considered to be a member of the jahnsite group, though the formula originally given does not conform to the general formula of minerals of that group. In this study, samples of keckite from different localities, including the type localit

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6916fcf6e0c2154221b637993e0e6895
https://doi.org/10.3749/canmin.48.6.1445

DC and AC conductivity of Li4/3Ti5/3O4 spinel

Autor: E. Schmidbauer, Michael Holzapfel, Andreas Laumann, Karl Thomas Fehr

Publikováno v: Solid State Ionics. 181:1111-1118

The electrical conductivity of polycrystalline Li 4/3 Ti 5/3 O 4 is reported between ∼ 300 K and ∼ 1000 K. Sintered and commercial pressed pellets were used for measurements. Impedance spectroscopy was applied (20 Hz–1 MHz) to determine the DC

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a6c8d77ebf8164520ed57b63e1a4261f
https://doi.org/10.1016/j.ssi.2010.05.026