Advanced transparent beryllium ceramics for ionizing radiation dosimetry

Victor S. Kijko 1Sergei V. Gladkovsky 1Ivan A. Dmitriev 1Andrei A. Sofronov 1Yuri N. Makurin 1Alexander L. Ivanovsky 2

1. Urals State Technical University (USTU-UPI), Mira,19, Ekaterinburg 620002, Russian Federation
2. Russian Academy of Sciences, Ural Division, Institute of Solid State Chemistry (ISSC), Pervomaiyskay, 91, Ekaterinburg 620219, Russian Federation

Abstract

At present BeO ceramics due to the unique complex a physicist-chemical characteristics are broadly used in radioelectronics, gas lasers production, as well as in ionizing radiation dosimetry. In connection with that the development of production technology of fine-grained transparent BeO ceramics, possessing high quantum luminescence output and relatively small flashing period, acquires particular urgency.
Samples of transparent BeO-based ceramics were produced by high temperature vacuum pressing at T=1520 K and the value of pressure 30 MPa during 15-20 minutes up to slump completion.The density of samples formed 3,01-3,02 g/cm3 and was close to theoretical.Lithium carbonate (0,4-1,0 wt.), boron oxides (0,01-0,5 wt.%) and rare-earth elements (REE) were used as additives for ceramics characteristics improvement.
It is shown that boron oxides doping gives a positive influence on microstructure and optical features of transparent beryllium ceramics. REE admixtures promote a quantum luminescence efficiency raise because of additional account of oxygen vacancies formation.
It is stated that studied ceramics posses high sensitivity to ionizing radiation and maintains transparency in the broad spectral range λ = 0,1 - 9,0 μm). Thereby, conducted studies have shown high efficiency of transparent BeO ceramics for ionizing radiation dosimetry usage.
The role of admixture phase in raising of 4,9 eV luminescence intensity peak attributed to the formation of additional optically active centres (oxygen vacancies) on BeO microcrystals surface and bringing about the formation of F-centres is determined.
The presented investigation was carried out under the support of RFBR of Russian Academy of Science (project # 1-03-96430) and federal "Integration" program (project IO965).

 

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Presentation: poster at E-MRS Fall Meeting 2003, Symposium A, by Victor S. Kijko
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-05-09 11:16
Revised:   2009-06-08 12:55