Zobrazeno 1 - 10
of 14
pro vyhledávání: '"Karsten Gömann"'
Publikováno v:
Chemical Geology. 353:96-111
This study of the hypabyssal kimberlite with particularly fresh olivine from the Palaeogene Koala pipe (Ekati cluster, Slave craton, Canada) is focused on reconstruction of the kimberlite parental melt. The Koala kimberlite sample is a typical ultram
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a490f784e99e127bdf2cf6a30c0bad6e
https://doi.org/10.1016/j.chemgeo.2012.09.022
https://doi.org/10.1016/j.chemgeo.2012.09.022
Autor:
V. Kempter, Wolfgang Maus-Friedrichs, Günter Borchardt, Anissa Gömann, Karsten Gömann, M. Frerichs
Publikováno v:
Applied Surface Science. 252:196-199
Perovskites of ABO3 type like strontium titanate (SrTiO3) are of great practical concern as materials for oxygen sensors operating at high temperatures. It is well known that the surface layer shows different properties compared to the bulk. Numerous
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6dcf60bdf9fb68cf8a8e92a8eeca26ab
https://doi.org/10.1016/j.apsusc.2005.01.116
https://doi.org/10.1016/j.apsusc.2005.01.116
Autor:
V. Kempter, Günter Borchardt, Karsten Gömann, L. Beuermann, Wolfgang Maus-Friedrichs, A. Gunhold
Publikováno v:
Surface Science. :105-110
Strontium titanate (SrTiO3) is a promising material for resistive high temperature oxygen sensors. Unfortunately, thermal treatment results in undesirable surface reconstruction and the formation of secondary phases. Each of the three stable surface
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fce99fc795b1a95971e699cc93a52b01
https://doi.org/10.1016/j.susc.2004.05.030
https://doi.org/10.1016/j.susc.2004.05.030
Publikováno v:
The Canadian Mineralogist. 42:601-617
Euhedral macrocrystals of Pt–Fe alloy from the Kondyor PGE placer, Khabarovskiy Kray, eastern Siberia, Russia, have a relatively constant composition of Pt2.4–2.6Fe, tin and antimony contents up to 0.3 wt.%, and an unusually low content of all PG
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9365d0875b030960faf2ee67d4658496
https://doi.org/10.2113/gscanmin.42.2.601
https://doi.org/10.2113/gscanmin.42.2.601
Publikováno v:
Phys. Chem. Chem. Phys.. 6:3639-3644
Titanium tracer diffusivities were determined in donor doped SrTiO3 at temperatures between 1573 and 1673 K in synthetic air. La-doped SrTiO3 single crystals cut in the three crystal orientations (100), (110), and (111), were used. After annealing, t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ec354ee436dc1a83d4f7a41ad6d3e857
https://doi.org/10.1039/b315210c
https://doi.org/10.1039/b315210c
Autor:
Wolfgang Maus-Friedrichs, Günter Borchardt, Simon Dorfman, Karsten Gömann, V. Kempter, Sergei Piskunov, A. Gunhold, Eugene A. Kotomin, L. Beuermann
Publikováno v:
Surface and Interface Analysis. 35:998-1003
The electronic structure of heated SrTiO3(110) surfaces was investigated with metastable impact electron spectroscopy and ultraviolet photoelectron spectroscopy (He(I). Scanning tunnelling microscopy and atomic force microscopy (AFM) were used to stu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::189e051b1605e7c02332e083b9748f77
https://doi.org/10.1002/sia.1638
https://doi.org/10.1002/sia.1638
Autor:
Wolfgang Maus-Friedrichs, Günter Borchardt, V. Kempter, Karsten Gömann, L. Beuermann, A. Gunhold
Publikováno v:
Analytical and Bioanalytical Chemistry. 375:924-928
SrTiO(3)(100) single crystals with high donor dopant concentrations (5 at% La) were annealed at 1000 degrees C for up to 150 h in ultrahigh vacuum (UHV). By applying scanning tunneling microscopy (STM) nanostructures are observed on top of the surfac
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c84806e081506dc7aa48a3336779733a
https://doi.org/10.1007/s00216-003-1807-3
https://doi.org/10.1007/s00216-003-1807-3
Island formation on 0.1 at.% La-doped SrTiO3(100) at elevated temperatures under reducing conditions
Autor:
A. Gunhold, Wolfgang Maus-Friedrichs, Karsten Gömann, G. Borchardt, L. Beuermann, V. Kempter, M. Frerichs
Publikováno v:
Surface Science. 523:80-88
Annealing of 0.1 at.% La-doped SrTiO3(1 0 0) under reducing conditions (pO2⩽10−8 mbar) between 1000 and 1300 °C for 2 h leads to the formation of islands, which coalesce yielding agglomerates with characteristic dimensions of several micrometers
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::af31eef80f99830fbb8e00a91ede1160
https://doi.org/10.1016/s0039-6028(02)02402-0
https://doi.org/10.1016/s0039-6028(02)02402-0
Autor:
Karsten Gömann, L. Beuermann, Günter Borchardt, Wolfgang Maus-Friedrichs, M. Frerichs, V. Kempter, A. Gunhold
Publikováno v:
Surface Science. :447-452
SrTiO 3 (1 0 0) single crystals with two different donor dopant concentrations were heated at 1300 °C in synthetic air and ultrahigh vacuum, respectively, and afterwards studied with atomic force microscopy to characterize the surface topology. Dept
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1630176dc90c125e82b3cd77b2aaa352
https://doi.org/10.1016/s0039-6028(02)01284-0
https://doi.org/10.1016/s0039-6028(02)01284-0
Autor:
Karsten Gömann, Han Wei, J. Helmbold, G. Lilienkamp, V. Kempter, Günter Borchardt, W. Maus-Friedrichs
Publikováno v:
Journal of Electroceramics. 8:221-228
Heating 5at.% (on A-site) La-doped SrTiO3(100) single crystals in an ambient atmosphere at 1300°C for 120 h results in the formation of insulating islands on top of the surface with typical dimensions of up to 50 μm. The islands and the surface bet
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::05c2f604ae8bfe777c5225f3d0881ee8
https://doi.org/10.1023/a:1020850101504
https://doi.org/10.1023/a:1020850101504