TY - JOUR
T1 - Annealing study of Fe 2O 3 nanoparticles
T2 - Magnetic size effects and phase transformations
AU - Xu, X. N.
AU - Wolfus, Y.
AU - Shaulov, A.
AU - Yeshurun, Y.
AU - Felner, I.
AU - Nowik, I.
AU - Koltypin, Yu
AU - Gedanken, A.
PY - 2002/4/1
Y1 - 2002/4/1
N2 - Sonochemically synthesized Fe 2O 3 nanoparticles were annealed in air or in vacuum while their magnetization was continuously recorded. Annealing in vacuum at temperatures T a between 240 and 450°C produced nanophases of γ-Fe 2O 3 with average particle size ranging from 4 to 14 nm, depending on T a. Phase transformation into α-Fe 2O 3 occurred directly by annealing in air, or via an intermediate Fe 3O 4 phase by annealing in vacuum at temperatures higher than 450°C. Mapping the correlation between the magnetic properties and the annealing conditions, enables control of the annealing process to obtain nanocrystals of γ-Fe 2O 3, α-Fe 2O 3, or Fe 3O 4 with different particle size and magnetic properties.
AB - Sonochemically synthesized Fe 2O 3 nanoparticles were annealed in air or in vacuum while their magnetization was continuously recorded. Annealing in vacuum at temperatures T a between 240 and 450°C produced nanophases of γ-Fe 2O 3 with average particle size ranging from 4 to 14 nm, depending on T a. Phase transformation into α-Fe 2O 3 occurred directly by annealing in air, or via an intermediate Fe 3O 4 phase by annealing in vacuum at temperatures higher than 450°C. Mapping the correlation between the magnetic properties and the annealing conditions, enables control of the annealing process to obtain nanocrystals of γ-Fe 2O 3, α-Fe 2O 3, or Fe 3O 4 with different particle size and magnetic properties.
UR - http://www.scopus.com/inward/record.url?scp=0036535925&partnerID=8YFLogxK
U2 - 10.1063/1.1457544
DO - 10.1063/1.1457544
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AN - SCOPUS:0036535925
SN - 0021-8979
VL - 91
SP - 4611
EP - 4616
JO - Journal of Applied Physics
JF - Journal of Applied Physics
IS - 7
ER -