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Microwave absorption by small metal particles
Affiliation:1. Department of Materials Science & Metallurgy, University of Cambridge, Cambridge CB3 0FS, UK;2. King Abdulaziz City for Science and Technology (KACST)-Oxford Centre of Excellence in Petrochemicals and Inorganic Chemistry Laboratory, University of Oxford, Oxford OX1 3QR, UK;3. The Queen''s College, University of Oxford, Oxford OX1 4AW, UK;4. Annwvyn Solutions (Independent Consultant), Bromley, Kent BR1 3DW, UK;1. University of California, Riverside, CA 92521, United States;2. University of Maryland, College Park, Maryland 20742, United States
Abstract:The dielectric response of small indium and iron crystals in complementary particle topologies is characterized by microwave absorption. A transition from non-absorptive to conducting behaviour was discovered in condensed indium-oil dispersions during thermal particle coarsening. Microwave losses in low-density networks of iron “nanocrystals” (sizes ≲ 10 nm) are attributed to percolation.
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