Fabrication and characterizations of Zn1−xCoxO bulk ceramics prepared by solid state reaction combined with spark plasma sintering

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Abstract

Zn1−xCoxO (x = 0.01, 0.05 and 0.1) bulk ceramics were prepared through a two-step, solid state reaction method combined with spark plasma sintering technique. The single phase Zn1−xCoxO powders were synthesized using ZnO and Co3O4 at 935 °C in air for 3 h. The Zn1−xCoxO bulks were prepared at sintering temperature from 900 to 1,100 °C for 5 min by SPS. The relative density of Zn1−xCoxO bulk ceramics sintered at 1,100 °C is higher than 99% of the theoretical value. The Structure, composition analysis, optical absorption, Raman and XPS measurements revealed that the Co2+ substituted Zn2+ ions and was incorporated into the lattice of ZnO in both of the single phase Zn1−xCoxO powders and bulk ceramics. Room- and low-temperature magnetization measurements reveal a paramagnetic behavior and that the paramagnetic Co amount is smaller than the nominal Co concentration for all of Zn1−xCoxO samples at 4 K. The paramagnetic magnetism of bulk ceramics is apparently larger than that of powders with the same composition. The electrical properties measurements reveal that the Co concentration has a slight influence on the electrical properties of Zn1−xCoxO bulk ceramics. The carriers concentration is about 1 × 1020 cm−3 and with the Co concentration increases the resistivity slightly increases from 3.56 × 10−3 (x = 0.01) to 5.58 × 10−3 (x = 0.1) Ωcm.

Keywords

Co3O4 Spark Plasma Sinter Solid State Reaction Method Moss Green Bulk Ceramic 
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Notes

Acknowledgments

This work was financially supported by the New Century Excellent Talents in University (NCET-10-0662).

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of TechnologyWuhanChina

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