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Mössbauer Spectroscopy and Electrical Conductivity of Fe-Dopedβ-Rhombohedral Boron

✍ Scribed by Takahiro Nakayama; Hirofumi Matsuda; Kaoru Kimura; Hiromitsu Ino

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
265 KB
Volume
133
Category
Article
ISSN
0022-4596

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✦ Synopsis

Iron and/or aluminum are doped to -rhombohedral boron, and the electrical conductivity and 57 Fe Mo¨ssbauer effect are measured. The temperature dependence of the electrical conductivity is explained as a variable range hopping type. The conductivity increases with an increase in Fe concentration, but it is insensitive to Al concentration. The Mo¨ssbauer spectra measured at room temperature are resolved into three kinds of doublets and a sextet due to ferromagnetic FeB. One doublet, 0 , is attributed to Fe 3؉ ions at A 1 sites, while the others, 1 and 2 , occur from Fe 2؉ ions at D sites. When Fe and Al atoms are simultaneously doped into -boron, the intensity of the 0 doublet decreases and, hence, those of the 1 and 2 doublets relatively increase. The results shows that Fe atoms are moved from A 1 sites to D sites by Al atoms. It is proposed that the 1 doublet corresponds to Fe 2؉ (D)-Fe 2؉ (D) and the 2 doublet to Fe 2؉ (D) and that a part of Fe 2؉ (D) is in the magnetic state at 4.2 K.

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