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Transparent Lu2O3:Eu Ceramics

Published online by Cambridge University Press:  27 July 2011

Zachary M. Seeley ,
Joshua D. Kuntz ,
Nerine J. Cherepy  and
Stephen A. Payne
Zachary M. Seeley
Affiliation:
Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, CA 94550-9698, U.S.A.
Joshua D. Kuntz
Affiliation:
Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, CA 94550-9698, U.S.A.
Nerine J. Cherepy
Affiliation:
Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, CA 94550-9698, U.S.A.
Stephen A. Payne
Affiliation:
Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, CA 94550-9698, U.S.A.
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Abstract

We are developing highly transparent ceramic oxide scintillators for high energy (MeV) radiography screens. Lutetium oxide doped with europium (Lu2O3:Eu) is the material of choice due to its high light yield and stopping power. As an alternative to hot-pressing, we are utilizing vacuum sintering followed by hot isostatic pressing (HIP). Nano-scale starting powder was uniaxially pressed into compacts and then sintered under high vacuum, followed by HIP’ing. Vacuum sintering temperature proved to be a critical parameter in order to obtain highly transparent Lu2O3:Eu. Under-sintering resulted in open porosity disabling the driving force for densification during HIP’ing, while over-sintering lead to trapped pores in the Lu2O3:Eu grain interiors. Optimal vacuum sintering conditions allowed the pores to remain mobile during the subsequent HIP’ing step which provided enough pressure to close the pores completely resulting in fully-dense highly transparent ceramics. Currently, we have produced 3 mm thick by 4.5 cm diameter ceramics with excellent transparency, and anticipate scaling to larger sizes while maintaining comparable optical properties.

Keywords

sinteringporositydensification
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1341: Symposium U – Nuclear Radiation Detection Materials , 2011 , mrss11-1341-u01-02
Copyright
Copyright © Materials Research Society 2011

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References

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