3 years ago

Spectroscopic Study of the Reversible Chemical Reduction and Reoxidation of Substitutional Cr Ions in Sr2TiO4

Spectroscopic Study of the Reversible Chemical Reduction and Reoxidation of Substitutional Cr Ions in Sr2TiO4
Anubhab Haldar, Keith A. Lehuta, Dongming Zhou, Kevin R. Kittilstved
We demonstrate control over the concentration of substitutional Cr3+ in Sr2TiO4 by a low temperature solid state chemical reduction with NaBH4. The concentration of Cr3+ is quantified by electron paramagnetic resonance spectroscopy and increases by over an order of magnitude after reduction at only 375 °C for 30 min. These changes can be quantitatively reversed through aerobic oxidation at the same temperature and time, suggesting low activation energies of defects that are ultimately responsible for these observations.

Publisher URL: http://dx.doi.org/10.1021/acs.inorgchem.7b01210

DOI: 10.1021/acs.inorgchem.7b01210

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