X-RAY-ABSORPTION STUDY OF PRO2 AT HIGH-PRESSURE

被引：47

作者：

HU, Z

BERTRAM, S

KAINDL, G

机构：

[1] Institut für Experimentalphysik, Freie Universität Berlin, D-14195 Berlin-Dahlem

来源：

PHYSICAL REVIEW B | 1994年 / 49卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.49.39

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

X-ray-absorption near-edge structure (XANES) spectra at the Pr L(III) threshold were studied for tetravalent PrO2 as a function of external pressure up to congruent-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 CeO2 and CeF4. 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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页码：39 / 43

页数：5

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