Journals →  Materialy Elektronnoi Tekhniki →  2013 →  #3 →  Back

PHYSICAL CHARACTERISTICS AND THEIR STUDY
ArticleName Investigation of Effects Induced by Weak Magnetic Fields in Iron Powders
ArticleAuthor E. A. Skryleva, N. Yu. Tabachkova, K. D. Scherbachev, M. I. Voronova
ArticleAuthorData

National University of Science and Technology «MISIS»:

E. A. Skryleva

N. Yu. Tabachkova

K. D. Scherbachev

M. I. Voronova

Abstract

The effect of magnetic field treatment on the structure and chemical composition of reduced iron powders has been studied. The methods of transmission electron microscopy, X−ray diffraction and X−ray photoelectron spectroscopy have been used, and corrosion rate has been measured. We show that the processing of powders in an installation having an alternating magnetic field of 0.1 T and a frequency of 21 Hz does not result in any changes to the structure and phase composition. Reduced iron powder particles are spherical; the average diameter is of 2−3 microns, the particles being covered with an amorphous shell. Surface chemical composition studies have shown the shell to be a layer of natural ferric oxide/hydroxide forming in air. A method has been developed for determining the thickness of the oxide shell covering the spherical particles based on the relation of photoelectron lines intensities of the zero−valent and oxidized iron. We show that the shell thickness in magnetic field treated specimens is by 10−20% less than that in untreated powder. Corrosion rate measurements in a corrosive environment have shown that magnetic treatment significantly reduces the oxidation rate of the powders: the more the processing time, the lower the corrosion rate.

keywords Iron powders, magnetic field treatment, structural parameters, chemical composition, oxide coating
References

1. Al’shic, V. I. Magnitoplasticheskii effekt: osnovnye svoistva i fizicheskie mehanizmy / V. I. Al’shic, E. V. Darinskaya, M. V. Koldaeva, E. A. Petrzhik // Kristallografiya. − 2003. − T. 48, N 5. − P. 838—867.
2. Golovin, Yu. I. Magnitoplastichnost’ tverdyh tel / Yu. I. Golovin.  M. : Mashinostroenie−1, 2003.  107 p.

3. Morgunov R. B. Spinovaya mikromehanika v fizike plastichnosti / R. B. Morgunov // UFN.  2004.  T. 174, N 2.  P. 131—153.
4. Golovin, Yu. I. Vliyanie magnitnogo polya na plastichnost’, foto− i elektrolyuminescenciyu monokristallov ZnS / Yu. I. Golovin, R. B. Morgunov, A. A. Baskakov, M. V. Badylevich, S. Z. Shmurak // PZhETF. − 2004. − T. 69, vyp. 2 − P. 114—118.
5. Golovin, Yu. I. Vliyanie magnitnogo polya na intensivnost’ elektrolyuminescencii monokristallov ZnS / Yu. I. Golovin, R. B. Morgunov, A. A. Baskakov, S. Z. Shmurak // FTT. − 1999. − T. 41, N 11. − P. 1944—1947.
6. Koplak, O. V. Magnitomehanicheskii effekt v pripoverhnostnyh sloyah kremniya Cz−Si /O. V. Koplak, A. I. Dmitriev, R. B. Morgunov // FTT. − 2012. − T. 54, Iss. 7. − P. 1350—1355.
7. Makara, V. A. Vliyanie slabogo magnitnogo polya na mikromehanicheskie i elektrofizicheskie harakteristiki kremniya dlya solnechnoi energetiki / V. A. Makara, O. A. Korotchenkov, L. P. Steblenko, A. A. Podolyan, D. V. Kalinichenko // FTP. − 2013. − T. 47, Iss. 5. − P. 652—657.
8. Lee, J. D. Magnetic field effects on the surface morphology of Mn−oxide / J. D. Lee, H. S. Kim, S. Y. Jeong, K. H. Kim, J. J. Lee, B. Y. Ahn, S. I. Kim // J. Korean Phys. Soc.  2007.  V. 51, N 3. P. 1109—1112.
9. Kim, J.−S. The effect of an applied magnetic field on the (111) texture of a NiFe layer for perpendicular magnetic recording media / J.−S. Kim, S.−H. Na, S.−K. Lim // J. Korean Phys. Soc.  2012.  V. 61, N 1.  P. 93—96.
10. Chibirova, F. Kh. Magnetic effects in Co3−Xo4 defect films from the data of emission Mössbauer spectroscopy / F. Kh. Chibirova // Phys. solid state.  2001.  V. 43, N 7.  P. 1291—1298.
11. Chibirova, F. H. Osobennosti perestroiki defektnoi struktury magnetita v vihrevom magnitnom pole po dannym messbauerovskoi spektroskopii / F. H. Chibirova // ZhFH. − 2008. − T. 82, N 9. − P. 1—3.
12. Grosvenor, A. P. Investigation of multiplet splitting of Fe 2p XPS spectra and bonding in iron compounds / A. P. Grosvenor, B. A. Kobe, M. C. Biesinger, N. S. McIntyre // Surf. Interface Anal.  2004.  V. 36.  P. 1564—1574.
13. Grosvenor, A. P. Studies of the oxidation of iron by water vapour using X−ray photoelectron spectroscopy and QUASES / A. P. Grosvenor, B. A. Kobe, N. S. McIntyre // Surf. Sci.  2004. V. 572.  P. 217—227.
14. Stervoedov, A. N. Osobennosti primeneniya rentgenovskoi fotoelektronnoi spektroskopii dlya opredeleniya tolshiny ul’tratonkih plenok / A. N. Stervoedov, V. M. Beresnev, N. V. Sergeeva // FIP FIP PSE. − 2010. − T. 8, N 1. − P. 88—92.
15. Mohai, M. Calculation of overlayer thickness on curved surfaces based on XPS intensities / M. Mohai, I. Bertoti / Surf. Interface Anal.  2004.  V. 36.  P. 805—808.
16. Tanuma, S. Calculations of electron inelastic mean free paths for 31 materials / S. Tanuma, C. J. Powell, D. R. Penn // Ibid.  1988.  V. 11.  P. 577—589.

Language of full-text russian
Full content Buy
Back