MOSSBAUER STUDY OF (FE1-XNIX)7SE8

被引：22

作者：

OK, HN ^{[1
]}

BAEK, KS ^{[1
]}

KIM, EC ^{[1
]}

KIM, CS ^{[1
]}

机构：

[1] KOOKMIN UNIV,DEPT PHYS,SEOUL 136702,SOUTH KOREA

来源：

PHYSICAL REVIEW B | 1993年 / 48卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.48.3212

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

(Fe1-xNix)7Se8 (x = 0.02, 0.05, 0.08) has been studied with Mossbauer spectroscopy and x-ray diffraction. The crystal structure is found to be a triclinic superstructure of the NiAs structure while Fe7Seg has a hexagonal structure. Abrupt change of quadrupole shifts near 122 K suggests that the spin-rotation transition proceeds abruptly, in contrast with the gradual transition reported for Fe7Se8 with a triclinic superstructure. The iron ions at all four sites are found to be in a highly covalent ferrous state. Both Neel and Debye temperatures are found to decrease with increasing nickel concentration.

引用

页码：3212 / 3215

页数：4

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