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Transparent nanocrystalline MgO by rapid and low-temperature spark plasma sintering

Published online by Cambridge University Press:  03 March 2011

Rachman Chaim ,
Zhijian Shen  and
Mats Nygren
Rachman Chaim*
Affiliation:
Department of Materials Engineering, Technion–Israel Institute of Technology, Haifa 32000, Israel
Zhijian Shen
Affiliation:
Department of Inorganic Chemistry, BRIIE Center for Inorganic Interfacial Engineering, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden
Mats Nygren
Affiliation:
Department of Inorganic Chemistry, BRIIE Center for Inorganic Interfacial Engineering, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden
*
a) Address all correspondence to this author. e-mail: rchaim@technion.ac.il
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Abstract

We investigated superfast densification of nanocrystalline MgO powders by spark plasma sintering (SPS) between 700 °C and 825 °C under applied pressures of 100and 150 MPa. Fully-dense transparent nanocrystalline MgO with a 52-nm average grain size was fabricated at 800 °C and 150 MPa for 5 min. In-line transmissionsof 40% and 60% were measured compared to MgO single crystal, for the yellowand red wavelengths, respectively. Densification occurs by particles sliding over each other; the nanometric grain size and pores lead to the optical transparency. The light brownish color of the nanocrystalline MgO is due to the oxygen vacancy color centers, originating from the reducing atmosphere of the SPS process.

Keywords

CeramicNanoparticleSintering
Type
Rapid Communications
Information
Journal of Materials Research , Volume 19 , Issue 9 , September 2004 , pp. 2527 - 2531
Copyright
Copyright © Materials Research Society 2004

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