COMPARATIVE MOSSBAUER-EFFECT STUDY OF SEVERAL R2FE17 AND R2FE17NX COMPOUNDS

被引:34
作者
LONG, GJ
MISHRA, S
PRINGLE, OA
GRANDJEAN, F
BUSCHOW, KHJ
机构
[1] UNIV MISSOURI,DEPT PHYS,ROLLA,MO 65401
[2] STATE UNIV LIEGE,INST PHYS,B-4000 SART,BELGIUM
[3] PHILIPS RES LABS,5600 JA EINDHOVEN,NETHERLANDS
关键词
D O I
10.1063/1.355486
中图分类号
O59 [应用物理学];
学科分类号
摘要
The Mossbauer spectra of Sm2Fe17 and Ho2Fe17 and their nitrides have been measured between 295 and 85 K and analyzed with a model which is consistent with our earlier work on R2Fe17 and R2Fe17Nx compounds, where R is Pr, Nd, and Th. This model is completely consistent throughout these rare-earth compounds and is in agreement with the crystallographic changes occurring upon nitrogenation and with the prediction of band structure calculations. The dramatic increase in Curie temperature in the nitrides results from the expansion of the crystallographic lattice, an expansion which is mainly centered on the 9d and 18h iron sites as is indicated by the increase of their Wigner-Seitz cell volumes upon nitrogenation. The 9d and 18h sites show a larger enhancement of their hyperfine fields as compared to the 6c and 18f sites as a result of improved ferromagnetic exchange between these sites and their near neighbors because of the lattice expansion and the consequent reduced iron 3d-iron 3d overlap.
引用
收藏
页码:5994 / 5996
页数:3
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