TY  - JOUR
A1  - Sternemann, C.
A1  - Wilke, Max
T1  - Spectroscopy of low and intermediate Z elements at extreme conditions: in situ studies of Earth materials at pressure and temperature via X-ray Raman scattering
JF  - High pressure research
N2  - X-ray Raman scattering spectroscopy is an emerging method in the study of low and intermediate Z elements' core-electron excitations at extreme conditions in order to reveal information on local structure and electronic state of matter in situ. We discuss the capabilities of this method to address questions in Earth materials' science and demonstrate its sensitivity to detect changes in the oxidation state, electronic structure, coordination, and spin state. Examples are presented for the study of the oxygen K-, silicon L- and iron M-edges. We assess the application of both temperature and pressure in such investigations exploiting diamond anvil cells in combination with resistive or laser heating which is required to achieve realistic conditions of the Earth's crust, mantle, and core.
KW  - X-ray Raman scattering
KW  - inelastic X-ray scattering
KW  - X-ray absorption
KW  - high pressure research
KW  - diamond anvil cell
KW  - minerals
KW  - glasses
KW  - melts
KW  - Earth materials
KW  - spin transition
KW  - bonding transition
KW  - coordination transformation
KW  - oxidation state
KW  - electronic structure
Y1  - 2016
U6  - https://doi.org/10.1080/08957959.2016.1198903
SN  - 0895-7959
SN  - 1477-2299
VL  - 36
SP  - 275
EP  - 292
PB  - IOP Publ. Ltd.
CY  - Abingdon
ER  - 
TY  - JOUR
A1  - Rosa, A. D.
A1  - Pohlenz, Julia
A1  - de Grouchy, C.
A1  - Cochain, B.
A1  - Kono, Y.
A1  - Pasternak, S.
A1  - Mathon, O.
A1  - Irifune, T.
A1  - Wilke, Max
T1  - In situ characterization of liquid network structures at high pressure and temperature using X-ray absorption spectroscopy coupled with the Paris-Edinburgh press
JF  - High pressure research
N2  - We review recent progress in studying structural properties of liquids using X-ray absorption spectroscopy coupled with the Paris-Edinburgh press at third-generation synchrotron facilities. This experimental method allows for detecting subtle changes in atomic arrangements of melts over a wide pressure-temperature range. It has been also employed to monitor variations of the local coordination environment of diluted species contained in glasses, liquids and crystalline phases as a function of the pressure and temperature. Such information is of great importance for gaining deeper insights into the physico-chemical properties of liquids at extreme condition, including the understanding of such phenomena as liquid-liquid phase transitions, viscosity drops and various transport properties of geological melts. Here, we describe the experimental approach and discuss its potential in structural characterization on selected scientific highlights. Finally, the current ongoing instrumental developments and future scientific opportunities are discussed.
KW  - X-ray absorption
KW  - Paris-Edinburgh press
KW  - liquid structure
KW  - high pressure and temperature
KW  - EXAFS
Y1  - 2016
U6  - https://doi.org/10.1080/08957959.2016.1199693
SN  - 0895-7959
SN  - 1477-2299
VL  - 36
SP  - 332
EP  - 347
PB  - American Geophysical Union
CY  - Abingdon
ER  -