STUDY OF THE VALENCY OF RARE-EARTH ATOMS IN THE MISFIT-LAYER COMPOUNDS (RS)1+DELTA-NBS2 (R = LA, CE, SM) USING RESONANT PHOTOEMISSION AND X-RAY-ABSORPTION SPECTRA

被引:18
作者
ETTEMA, ARHF [1 ]
VANSMAALEN, S [1 ]
HAAS, C [1 ]
TURNER, TS [1 ]
机构
[1] SERC,DARESBURY LAB,WARRINGTON WA4 4AD,CHESHIRE,ENGLAND
来源
PHYSICAL REVIEW B | 1994年 / 49卷 / 15期
关键词
D O I
10.1103/PhysRevB.49.10585
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The photoelectron spectrum of (CeS)1.16NbS2 shows a strong resonance enhancement at a photon energy of 120 eV for states with a binding energy of 2.4 eV. The resonance is due to Ce 4d(10)4f1-->4d(9)4f2 transitions, and is evidence that the Ce atoms in this compound have the valency Ce3+ (4f1). The 3d x-ray-absorption spectrum of (LaS)1.14NbS2, (CeS)1.16NbS2, and (SmS)1.19NbS2 exhibit a multiplet structure which is characteristic for La3+ (4f0), Ce3+ (4f1), and Sm3+ (4f5). We conclude that in the misfit-layer compounds (RS)1+deltaNbS2 (R = La,Ce,Sm) the rare-earth atoms are trivalent.
引用
收藏
页码:10585 / 10590
页数:6
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