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Tailoring of crystal phase and Néel temperature of cobalt monoxides nanocrystals with synthetic approach conditions
Published in American Institute of Physics Inc.
2014
Volume: 116
   
Issue: 3
Abstract
Cobalt monoxide (CoO) nanocrystals were synthesized by thermal decomposition of cobalt oleate precursor in a high boiling point organic solvent 1-octadecene. The X-ray diffraction pattern and transmission electron microscopy studies suggest that pure face-centered-cubic (fcc) phase of CoO can be synthesized in the temperature range of 569-575 K. Thermolysis product at higher synthesis temperature 585 K is a mixture of fcc and hexagonal-closed- packed (hcp) phases. These nanocrystals are single crystals of CoO and exhibit mixture of two types of morphologies; one is nearly spherical with 5-25 nm diameter, and other one is 5-10 nm thick flake. The pure fcc-CoO nanocrystals show enhanced, and mixture of fcc- and hcp-CoO nanocrystals show reduced antiferromagnetic ordering temperature. Such results provide new opportunities for optimizing and enhancing the properties and performance of cobalt oxide nanomaterials. © 2014 AIP Publishing LLC.
About the journal
JournalData powered by TypesetJournal of Applied Physics
PublisherData powered by TypesetAmerican Institute of Physics Inc.
ISSN00218979
Open AccessNo
Concepts (15)
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    Cobalt
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    Cobalt compounds
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    Decomposition
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    Mixtures
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    Transmission electron microscopy
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    X ray diffraction
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    1-OCTADECENE
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    Antiferromagnetic ordering temperature
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    COBALT OXIDES
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    Crystal phase
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    FACE CENTERED CUBIC PHASE
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    SYNTHESIS TEMPERATURES
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    Synthetic approach
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    Temperature range
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    Nanocrystals