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http://dx.doi.org/10.4283/JKMS.2014.24.2.041

Mössbauer Study of (Fe0.95Ni0.05)7Se8  

Kim, Eng-Chan (Department of Physics, Yeungnam University)
Publication Information
Journal of the Korean Magnetics Society / v.24, no.2, 2014 , pp. 41-45 More about this Journal
Abstract
By M$\ddot{o}$ssbauer spectroscopy and x-ray measurement $(Fe_{0.95}Ni_{0.05})_7Se_8$ has been studied. The crystal structure of $(Fe_{0.95}Ni_{0.05})_7Se_8$ is found to be a triclinic superstructure of the NiAs sturcture while $Fe_7Se_8$ has a orthohexagonal superstructure. Abrupt changes of quadrupole shifts near 125 K for $(Fe_{0.95}Ni_{0.05})_7Se_8$ suggests that the spin-rotation transition proceeds abruptly, in contrast with the gradual transition reported for $Fe_7Se_8$ with a triclinic superstructure. Isomer shifts indicate a ferrous state for the iron ions at all four states.
Keywords
M$\ddot{o}$ssbauer spectroscopy; spin-rotation; abrupt change;
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