Measurement of the Energy and High-Pressure Dependence of X-ray-Induced Decomposition of Crystalline Strontium Oxalate
Document Type
Article
Publication Date
1-1-2017
Publication Title
Journal of Physical Chemistry A
Volume
121
Issue
38
First page number:
7108
Last page number:
7113
Abstract
We report measurements of the X-ray-induced decomposition of crystalline strontium oxalate (SrC2O4) as a function of energy and high pressure in two separate experiments. SrC2O4 at ambient conditions was irradiated with monochromatic synchrotron X-rays ranging in energy from 15 to 28 keV. A broad resonance of the decomposition yield was observed with a clear maximum when irradiating with ∼20 keV X-rays and ambient pressure. Little or no decomposition was observed at 15 keV, which is below the Sr K-shell energy of 16.12 keV, suggesting that excitation of core electrons may play an important role in the destabilization of the C2O42- anion. A second experiment was performed to investigate the high-pressure dependence of the X-ray-induced decomposition of strontium oxalate at fixed energy. SrC2O4 was compressed in a diamond anvil cell (DAC) in the pressure range from 0 to 7.6 GPa with 1 GPa increments and irradiated in situ with 20 keV X-rays. A marked pressure dependence of the decomposition yield of SrC2O4 was observed with a decomposition yield maximum at around 1 GPa, suggesting that different crystal structures of the material play an important role in the decomposition process. This may be due in part to a phase transition observed near this pressure. (Chemical Equation Presented). © 2017 American Chemical Society.
File Format
File Size
2660 KB
Language
english
Repository Citation
Goldberger, D.,
Evlyukihin, E.,
Cifligu, P.,
Wang, Y.,
Pravica, M.
(2017).
Measurement of the Energy and High-Pressure Dependence of X-ray-Induced Decomposition of Crystalline Strontium Oxalate.
Journal of Physical Chemistry A, 121(38),
7108-7113.
http://dx.doi.org/10.1021/acs.jpca.7b05604
