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Decrystallizing Solid Crystalline Titania, Without Melting, Using Microwave Magnetic Fields
Author(s) -
Roy Rustum,
Fang Yi,
Cheng Jiping,
Agrawal Dinesh K.
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00261.x
Subject(s) - pellets , materials science , rutile , microwave , ceramic , raman spectroscopy , atmosphere (unit) , reducing atmosphere , magnetic field , analytical chemistry (journal) , composite material , mineralogy , chemical engineering , metallurgy , optics , chemistry , physics , chromatography , quantum mechanics , engineering , thermodynamics
TiO 2 —a prototype ceramic—was decrystallized in a 2.45 GHz AC magnetic field in a single mode TE 103 applicator. The titania powders were synthesized by a sol–gel process and pressed into circular pellets. The pellets were very slightly reduced at 1273 K in a reducing atmosphere. The reduced pellets were introduced into the single mode microwave cavity and placed at the magnetic field maximum node and exposed for 10–30 s in a forming gas atmosphere. The reacted samples were then characterized by XRD, SEM, Raman, and TEM. The data presented in this note demonstrate that a very short treatment in the AC magnetic field at 2.45 GHz can transform rutile structure oxides to a noncrystalline state.