Fray Symposium - Reaction Kinetics By Coherent Electromagnetic wave Energy At GHz
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2011-Sustainable Industrial Processing Summit
SIPS2011 Volume 1: Sustainable Non-ferrous Smelting in 21st Century

Editors:Florian K
Publisher:Flogen Star OUTREACH
Publication Year:2012
Pages:828 pages
ISBN:978-0-9879917-0-6
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)

    Reaction Kinetics By Coherent Electromagnetic wave Energy At GHz

    Motoyasu Sato1;
    1NATIONAL INSTITUTE FOR FUSION SCIENCE, Toki-city, Japan;
    Type of Paper: Regular
    Id Paper: 222
    Topic: 4

    Abstract:

    In more than 20 years, huge numbers of studies have been explored to make clear the mechanism of unexpected behaviors in microwave processing, for examples, the crystallographic transitions from microns to several tens nano meters on magnetic materials involving unpaired spin in 3d orbit under the exposure in magnetic field of microwave the rapid sintering of many kind of ceramics without crystal growths and the synthesis of natural super-lattice structure in the binary system, etc. The striking similarity of ultrasound and microwave at high temperature remained us the word of “coherency”. The Gibbs free energy (G = H – TS) contains two different ordering terms that are the disordered thermal motions (origin of high entropy) and the coherent kinetic motions with microscopic ordered structure (origin of low entropy). As the microwave processing uses monochromatic frequency, the electric or magnetic fields generate ordered motions in the material first. The entropy of coherent phonons is lower than the random motion of thermal photons. It experiences various non-thermally equilibrium stage of entropy and finally to reduced to thermally equilibrium stage. H.D. Kimrey reported that the activation energy from the relation of sintering rate for alumina to reciprocal temperature showed a drop in activation energy from 575kJ/mol to 170 kJ/mol for microwave sintering. The decreasing of activation energy has been observed in the reduction process of Titanium oxide (TiO2) under the irradiation of microwave magnetic field. The fall of energy can also be seen on the phase transitions. For example, the nano-crystallographic of ferromagnetic powders in which the hard magnetism converted to very soft one. These experiments show that the microwave couples with different energy path on the phase transitions.These phenomena require very sophisticated studies of renormalization theories, and molecular dynamics such as ab initio calculation.

    Keywords:

    Material Processing, Coherent Electromagneticwave Energy, GHz~THz

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    Cite this article as:

    Sato M. Reaction Kinetics By Coherent Electromagnetic wave Energy At GHz. In: Florian K, editors. Sustainable Industrial Processing Summit SIPS2011 Volume 1: Sustainable Non-ferrous Smelting in 21st Century. Volume 1. Montreal(Canada): FLOGEN Star Outreach;2012. p..