X-ray-absorption study of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">PrO</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span> at high pressure

Z. Hu; S. Bertram; G. Kaindl

doi:10.1103/PhysRevB.49.39

X-ray-absorption study of ${PrO}_{2}$ at high pressure

Z. Hu, S. Bertram, and G. Kaindl

Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin-Dahlem, Germany

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Phys. Rev. B 49, 39 – Published 1 January, 1994

DOI: https://doi.org/10.1103/PhysRevB.49.39

Abstract

X-ray-absorption near-edge structure (XANES) spectra at the Pr $L_{III}$ threshold were studied for tetravalent ${PrO}_{2}$ as a function of external pressure up to ≃117 kbar. The observed spectral changes of the double-peaked white line reflect an increase of the Pr 4f/O 2p covalency with pressure, in analogy to previous results for tetravalent ${CeO}_{2}$ and ${CeF}_{4}$ . A splitting of the white-line component at the highest energy into two peaks, revealed in the second derivatives of the measured XANES spectra, is interpreted as arising from crystal-field interaction of the 5d states.

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Physical Review B

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X-ray-absorption study of ${PrO}_{2}$ at high pressure

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X-ray-absorption study of PrO2 at high pressure

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X-ray-absorption study of ${PrO}_{2}$ at high pressure