Mössbauer study of semiconducting and ferrimagnetic fly ash-recycled glass |
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| Authors: | T Nishida M Tokunaga Y Sugata S Kubuki |
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| Institution: | (1) Department of Biological and Environmental Chemistry, School of Humanity-Oriented Science and Engineering, Kinki University, Kayanomori11-6, Iizuka 820-8555, Japan;(2) Department of Biological and Environmental Chemistry, School of Humanity-Oriented Science and Engineering, Kinki University, Kayanomori11-6, Iizuka 820-8555, Japan;(3) Department of Biological and Environmental Chemistry, School of Humanity-Oriented Science and Engineering, Kinki University, Kayanomori11-6, Iizuka 820-8555, Japan;(4) Department of Chemical and Biological Engineering, Ube National College of Technology, Tokiwadai 2-14-1, Ube 755-8555, Japan |
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| Abstract: | Summary Room temperature M?ssbauer spectrum of fly ash-recycled glass (FARG), prepared with more than 86 mass% of fly ash and less
than 14 mass% of Fe2O3, comprises two types of doublets due to Fe(II) and Fe(III) of magnetite nanoparticles. Isothermal annealing of fly ash-recycled
glass at 1100 °C for 60 minutes results in a precipitation of ferrimagnetic magnetite phase having an internal magnetic field
of 46.4-48.2 T. When the Fe2O3 content is equal to or more than 14%, room temperature M?ssbauer spectrum of FARG shows a magnetic hyperfine structure due
to a magnetite phase, in addition to two doublets due to Fe(II) and Fe(III). An increase in the electric conductivity is observed
from the order of 10-8 to 10-6 S . cm-1 after heat treatment at around the crystallization temperature. This can be ascribed to an improved step-by-step electron
hopping from Fe(II) to Fe(III) of distorted FeO4 tetrahedra in the three-dimensional glass network. |
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