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Modified Ferromagnetic Chromium Dioxide
Author(s) -
KUBOTA BUICHI,
NISHIKAWA TOMOZO,
YANASE AKIRA,
HIROTA EIICHI,
MIHARA TOSHIHIRO,
IIDA YOSHIO
Publication year - 1963
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.1151-2916.1963.tb14608.x
Subject(s) - curie temperature , chromium , anhydrous , coercivity , ferromagnetism , materials science , analytical chemistry (journal) , lattice constant , grain size , decomposition , inorganic chemistry , chemistry , mineralogy , metallurgy , condensed matter physics , physics , organic chemistry , chromatography , diffraction , optics
Several mixtures in the system Te‐CrO 2 were prepared by the decomposition of anhydrous chromic acid, CrO 3 , and telluric acid (H 6 TeO 6 ) under high oxygen pressures; the physical and chemical properties were then studied. When Te was added, the grain size of CrO 2 decreased rapidly from 5 to 10 μ to 0.1 to 1.0 μ and the magnetic coercive force increased from 20 to 120 oersteds. The magnetic Curie temperature and the lattice constants of CrO 2 did not vary, however, with additions of Te up to 20 atomic %. X‐ray analysis showed that the CrO 2 plus Te was not a solid solution but a mixture of CrO 2 and TeCr 2 O 6 that was nonmagnetic.