Zobrazeno 1 - 10 of 42 pro vyhledávání: '"Georg Spiekermann"'
1
Akademický článek
A von Hámos spectrometer for diamond anvil cell experiments at the High Energy Density Instrument of the European X-ray Free-Electron Laser
Autor: Johannes M. Kaa, Zuzana Konôpková, Thomas R. Preston, Valerio Cerantola, Christoph J. Sahle, Mirko Förster, Christian Albers, Lélia Libon, Robin Sakrowski, Lennart Wollenweber, Khachiwan Buakor, Anand Dwivedi, Mikhail Mishchenko, Motoaki Nakatsutsumi, Christian Plückthun, Jan-Patrick Schwinkendorf, Georg Spiekermann, Nicola Thiering, Sylvain Petitgirard, Metin Tolan, Max Wilke, Ulf Zastrau, Karen Appel, Christian Sternemann
Publikováno v: Journal of Synchrotron Radiation, Vol 30, Iss 4, Pp 822-830 (2023)
A von Hámos spectrometer has been implemented in the vacuum interaction chamber 1 of the High Energy Density instrument at the European X-ray Free-Electron Laser facility. This setup is dedicated, but not necessarily limited, to X-ray spectroscopy m
Externí odkaz: https://doaj.org/article/32d2e42241d749648148d90eb690c561
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2
Akademický článek
Fivefold‐Coordinated Silicon in MgSiO3 Melt Accommodates Viscous Flow up to Transition Zone Pressures
Autor: Maximilian Schulze, Georg Spiekermann
Publikováno v: Geophysical Research Letters, Vol 50, Iss 22, Pp n/a-n/a (2023)
Abstract Fivefold‐coordinated silicon is assumed to be the transitional species that accommodates the structural relaxation needed for viscous flow of silicate melts, but so far robust insight at the atomic scale is missing. Furthermore, the role o
Externí odkaz: https://doaj.org/article/4fdf666df859428984c02f68c7adaf72
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3
Akademický článek
Structural and electron spin state changes in an x-ray heated iron carbonate system at the Earth's lower mantle pressures
Autor: Johannes M. Kaa, Christian Sternemann, Karen Appel, Valerio Cerantola, Thomas R. Preston, Christian Albers, Mirko Elbers, Lélia Libon, Mikako Makita, Alexander Pelka, Sylvain Petitgirard, Christian Plückthun, Vladimir Roddatis, Christoph J. Sahle, Georg Spiekermann, Christian Schmidt, Anja Schreiber, Robin Sakrowski, Metin Tolan, Max Wilke, Ulf Zastrau, Zuzana Konôpková
Publikováno v: Physical Review Research, Vol 4, Iss 3, p 033042 (2022)
The determination of the spin state of iron-bearing compounds at high pressure and temperature is crucial for our understanding of chemical and physical properties of the deep Earth. Studies on the relationship between the coordination of iron and it
Externí odkaz: https://doaj.org/article/124778482b2146ca923747c86b8d4890
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4
High-efficiency X-ray emission spectroscopy of cold-compressed Fe2O3 and laser-heated pressurized FeCO3 using a von Hámos spectrometer
Autor: Christian Albers, Robin Sakrowski, Nicola Thiering, Lélia Libon, Georg Spiekermann, Johannes M. Kaa, Hlynur Gretarsson, Martin Sundermann, Metin Tolan, Max Wilke, Christian Sternemann
Publikováno v: Journal of Analytical Atomic Spectrometry. 38:1097-1107
Fast and efficient (resonant) X-ray emission spectroscopy setup for the electronic structure at lower mantle conditions: high spin in laser-heated FeCO3 and a two-step spin transition in pressurized Fe2O3 with increasing valence to core intensity.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cb82e46c1e3288e934e34528592a5ec2
https://doi.org/10.1039/d3ja00014a
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5
Anomalous density, sound velocity, and structure of pressure-induced amorphous quartz
Autor: Sylvain Petitgirard, Christoph J. Sahle, Wim J. Malfait, Georg Spiekermann, Ingrid Blanchard, Eleanor S. Jennings, Marine Cotte, Motohiko Murakami
The study of quartz and other silica systems under pressure is one of the most prolific domains of research over the past 50 years because of their applications in material science and fundamental relevance to planetary interiors. The characterizatio
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f9f02315231a5aed22a4ff3e69c3b15e
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7
Setup to study the electronic structure of iron-bearing compounds in situ at conditions of the Earth’s lower mantle
Autor: Christian Albers, Robin Sakrowski, Georg Spiekermann, Lélia Libon, Max Wilke, Nicola Thiering, Hlynur Gretarsson, Martin Sundermann, Johannes Kaa, Metin Tolan, Christian Sternemann
The determination of the electronic structure of iron-bearing compounds at high pressure and high temperature (HPHT) conditions is of crucial importance for the understanding of the Earth’s interior and planetary matter. Information on their electr
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::22eff405244c515e55674cf09ca33eab
https://doi.org/10.5194/egusphere-egu22-7132
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9
Equation of state and high-pressure phase behaviour of SrCO3
Autor: Anna S. Pakhomova, Georg Spiekermann, Nicole Biedermann, Karen Appel, Wolfgang Morgenroth, Ilias Efthimiopoulos, Max Wilke, Konstantin Glazyrin, Jan Mueller, Elena Bykova
Publikováno v: European Journal of Mineralogy. 32:575-586
The high-pressure phase transition of strontianite ( SrCO3 ) was investigated at ambient temperature by means of powder and single-crystal X-ray diffraction. The samples were compressed in a diamond anvil cell to a maximum pressure of 49 GPa. Structu
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::71018baac432ccb59077adc73a5dc2fa
https://doi.org/10.5194/ejm-32-575-2020
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10
Fast operando X-ray pair distribution function using the DRIX electrochemical cell
Autor: Maria Diaz-Lopez, Dean S. Keeble, Philip A. Chater, Geoffrey L. Cutts, Georg Spiekermann, Valerie Pralong, Phoebe K. Allan, Allan Ross
Publikováno v: 'Journal of Synchrotron Radiation ', vol: 27, pages: 1190-1199 (2020)
Journal of Synchrotron Radiation
Journal of Synchrotron Radiation, International Union of Crystallography, 2020, 27 (5), pp.1190-1199. ⟨10.1107/S160057752000747X⟩
The Diamond Radial In Situ X-ray (DRIX) cell for combining electrochemical cycling with total scattering measurements is presented and applied to X-ray pair distribution function and X-ray Raman scattering studies on the high-capacity cathode materia
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::abd55f04ae912223dc14a12ed8e3920b
https://epn-library.esrf.fr/flora/jsp/index_view_direct_anonymous.jsp?record=doc:PUB_ESRF:56890
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