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Avoiding mineral alteration during microwave magnetization
Author(s) -
Walton Derek
Publication year - 2004
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2003gl019011
Subject(s) - mineral , matrix (chemical analysis) , microwave , magnetization , materials science , condensed matter physics , absorption (acoustics) , nuclear magnetic resonance , mineralogy , magnetic field , chemistry , physics , composite material , metallurgy , quantum mechanics
Recent microwave results reveal evidence of mineral alteration. This letter examines the energy absorption by the magnetic nanoparticles, and the heat flow to the matrix. It is shown that, since the temperature difference between the magnetic grains and the matrix is proportional to the power density at the sample, increasing the power density sufficiently can limit the matrix temperature increase to a few degrees, completely eliminating any possibility of mineral alteration.