scholarly journals Temperature-dependent x-ray absorption spectroscopy of colossal magnetoresistive perovskites

2005 ◽  
Vol 71 (12) ◽  
Author(s):  
N. Mannella ◽  
A. Rosenhahn ◽  
M. Watanabe ◽  
B. Sell ◽  
A. Nambu ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Temperature Dependent ◽  
X Ray ◽  
Colossal Magnetoresistive ◽  
X Ray Absorption

A facile heating cell forin situtransmittance and fluorescence X-ray absorption spectroscopy investigations

2013 ◽  
Vol 21 (1) ◽  
pp. 165-169 ◽  
Author(s):  
Pengfei An ◽  
Caihao Hong ◽  
Jing Zhang ◽  
Wei Xu ◽  
Tiandou Hu
Keyword(s):  
Absorption Spectroscopy ◽  
Ohmic Heating ◽  
Inert Atmosphere ◽  
Temperature Dependent ◽  
Structural Mechanism ◽  
X Ray ◽  
Novel Approach ◽  
Heat Shielding ◽  
X Ray Absorption

A facile heating cell has been designed forin situtransmittance and fluorescence X-ray absorption spectroscopy (XAS) measurements up to 1273 K under vacuum or an inert atmosphere. These high temperatures are achieved using a tantalum heating element by ohmic heating. Because of the small specific heat capacity, the temperature can be changed in a matter of minutes from room temperature to high temperature. Furthermore, a commercial power controller was adapted to provide stable temperature control. The construction of the heat shielding system provides a novel approach to reducing the beam's path length and the cell's size. The cell is inexpensive and easy to build. Its performance was evaluated byin situXAS measurements of the temperature-dependent structure of ceria nanocrystals. Some preliminary results for the structural mechanism in ceria nanocrystal redox applications are given.

Mn K-Edge X-Ray Absorption Spectroscopy (XAS) Studies of La1-xSrxMnO3

1997 ◽  
Vol 494 ◽  
Author(s):  
S. M. Mini ◽  
J. F. Mitchells ◽  
D. G. Hinks ◽  
Ahmet Alatasi ◽  
D. Rosenmann ◽  
...  
Keyword(s):  
Manganese Oxide ◽  
Absorption Spectroscopy ◽  
Energy Shift ◽  
Hole Doping ◽  
Oxide Systems ◽  
X Ray ◽  
Colossal Magnetoresistive ◽  
The Difference ◽  
X Ray Absorption ◽  
Made In

ABSTRACTSystematic Mn K-edge x-ray absorption spectroscopy (XAS) measurements on samples of La1-xSrxMnO3, which are precursors to colossal magnetoresistive (CMR) materials, are reported. Detailed results on the edge or chemical shift as a function of Sr concentration (hole doping) and sample preparation (air vs oxygen annealed), are discussed. For comparison, a systematic XANES study of the Mn K-edge energy shift, denoting valence change in Mn, has been made in standard manganese oxide systems. Contrary to expectations, the variation in near-edge energies for Mn in La0.725Sr0.275MnO3 were small when compared to the difference between that for manganese oxide standards of nominal valence of +3 and +4 (Mn2O3 and MnO2).

scholarly journals Decomposing electronic and lattice contributions in optical pump-X-ray probe transient inner-shell absorption spectroscopy of CuO

2019 ◽  
Vol 205 ◽  
pp. 04015
Author(s):  
Johannes Mahl ◽  
Stefan Neppl ◽  
Friedrich Roth ◽  
Catherine Saladrigas ◽  
Hendrik Bluhm ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Absorption Spectroscopy ◽  
Laser Pulses ◽  
Temperature Dependent ◽  
Optical Pump ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Absorption ◽  
532 Nm

Electronic and lattice contributions to transient X-ray absorption spectra of CuO are analyzed using picosecond time-resolved and temperature-dependent measurements. Super-bandgap excitation with 355 nm and 532 nm laser pulses leads to significantly different trends.

Temperature dependent X-ray absorption spectroscopy of the valence transition in EuNi2(Si0.20Ge0.80)2

2006 ◽  
Vol 378-380 ◽  
pp. 681-682 ◽  
Author(s):  
Kazuya Yamamoto ◽  
Koji Horiba ◽  
Munetaka Taguchi ◽  
Masaharu Matsunami ◽  
Nozomu Kamakura ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Temperature Dependent ◽  
Valence Transition ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Temperature dependent soft x-ray absorption spectroscopy of liquids

2014 ◽  
Vol 85 (10) ◽  
pp. 103102 ◽  
Author(s):  
Jan Meibohm ◽  
Simon Schreck ◽  
Philippe Wernet
Keyword(s):  
Absorption Spectroscopy ◽  
Temperature Dependent ◽  
X Ray ◽  
X Ray Absorption
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