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Nonagglomerated, submicron α–Fe2O3 particles: Preparation and application

Published online by Cambridge University Press:  31 January 2011

H-O. Jungk  and
C. Feldmann
H-O. Jungk
Affiliation:
Philips Research Laboratories, Weisshausstr. 2, D-52066 Aachen, Germany
C. Feldmann
Affiliation:
Philips Research Laboratories, Weisshausstr. 2, D-52066 Aachen, Germany
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Abstract

Spherical particles of α–Fe2O3 80 to 100 nm in size were prepared with the polyol method. Scanning electron microscopy, x-ray powder diffraction, and measurements of the diffuse reflection were used to characterize the powder material. The characteristic red color of hematite was adjusted after brief heating (250 °C, 15 min) which did not lead to further particle growth. The polyol method turned out to be suited for the preparation of quite concentrated (up to 20 wt%) and very stable suspensions of submicron Fe2O3 particles. Based on such suspensions, the red emitting phosphor Y2O2S:Eu was coated as a model substrate. As a result, very homogeneous coatings of α-Fe2O3 on the phosphor material were realized. Individual iron oxide particles on the phosphor surface confirm the presence of nonagglomerated Fe2O3 particles in the polyol medium.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 10 , October 2000 , pp. 2244 - 2248
Copyright
Copyright © Materials Research Society 2000

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