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IrOx–carbon nanotube hybrids: A nanostructured material for electrodes with increased charge capacity in neural systems

IrOx–carbon nanotube hybrids: A nanostructured material for electrodes with increased charge capacity in neural systems

Acta Biomaterialia, Volume 10, Issue 10, October 2014, Pages 4548–4558.     Nina M. Carretero, Mathieu P. Lichtenstein, Estela Pérez, Laura Cabana, Cristina Suñol, Nieves Casañ-Pastor

Valence change of praseodymium in Pr0.5Ca0.5CoO3 investigated by x-ray absorption spectroscopy

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11-07-2012 15-13-28

 

J. Herrero-Martín, J. L. García-Muñoz, S. Valencia, C. Frontera, J. Blasco, A. J. Barón-González, G. Subías, R. Abrudan, F. Radu, E. Dudzik, and R. Feyerherm 

©2011 American Physical Society

DOI:
10.1103/PhysRevB.84.115131
X-ray absorption spectroscopy measurements in Pr0.5Ca0.5CoO3 were performed at the Pr M4,5, Pr L3, and Ca L2,3 absorption edges as a function of temperature below 300 K. Ca spectra show no changes down to 10 K while a noticeable thermally dependent evolution takes place at the Pr edges across the metal-insulator transition. Spectral changes are analyzed by different methods, including multiple scattering simulations, which provide quantitative details on an electron loss at Pr 4f orbitals. We conclude that in the insulating phase a fraction [15(±5)%] of Pr3+ undergoes a further oxidation to adopt a hybridized configuration composed of an admixture of atomiclike 4f1 states (Pr4+) and f-symmetry states on the O 2p valence band (Pr3+L̲ states) indicative of a strong 4f-2p interaction.

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