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Original Articles

MAGNETIC FIELDS PRODUCED BY THE COMBUSTION OF METALS IN OXYGEN

, , , &
Pages 89-106 | Received 13 Nov 2000, Accepted 08 Aug 2001, Published online: 27 Apr 2007
 

Abstract

Weak magnetic fields produced by the combustion of pure metal and metal/metal-oxide powders in Rowing oxygen were measured by High-Tc Superconducting Quantum Interference Devices (SQUIDs). Two qualitatively different types of magnetic signals were observed for various reactions. The combustion of Nb, Cr, and Co generates a slowly oscillating field, while the combustion of Zr, Hf, Mn, Ti, Mg, and Fe generates a slowly oscillating field on which rapid oscillations are superimposed. The magnetic power spectra for these reactions scales as a power-law up to 100  Hz with an exponent between 0·64 and 0·96. This suggests that the magnetic field oscillations are generated by stochastic current fluctuations over a wide range of time scales. This may result from fluctuations in either the instantaneous shape and/or the velocity of the reaction zone. A simple electromagnetic model is used to predict the qualitative features observed in our experiments.

Additional information

Notes on contributors

D. LUSS

E-mail: [email protected]

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