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SELF-DIFFUSION OF BERYLLIUM IN UNIRRADIATED, COLD-PRESSED AND SINTERED BERYLLIUM OXIDE.

Author: de Bruin, H.J.; Watson, G.M.; Oak Ridge National Laboratory.; United States. Department of Energy. Office of Scientific and Technical Information.
Publisher: Oak Ridge, Tenn. : Oak Ridge National Laboratory. ; Oak Ridge, Tenn. : distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, [1964] [1964] 1964
Series: ORNL, 3526.
Edition/Format:   eBook : Document : National government publication : EnglishView all editions and formats
Summary:
Diffusion of beryllium-7 through polycrystalline unirradiated specimens of BeO was studied as a preliminary step to a study of diffusion in irradiated material. Beryllium-7 was deposited on one end of cylindrical specimens by exchange and adsorption from aqueous solution. The depth of penetration perpendicular to the surfaces of deposition was determined after annealing the specimens at pre-determined conditions. A  Read more...
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Additional Physical Format: Print version:
De Bruin, H.J.
Self-diffusion of beryllium in unirradiated, cold-pressed and sintered beryllium oxide.
Oak Ridge, Tenn. : Oak Ridge National Laboratory, 1964
(OCoLC)460783608
Material Type: Document, Government publication, National government publication, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: de Bruin, H.J.; Watson, G.M.; Oak Ridge National Laboratory.; United States. Department of Energy. Office of Scientific and Technical Information.
OCLC Number: 1065800302
Notes: Published through SciTech Connect.
01/29/1964.
"ornl-3526"
de Bruin, H.J.; Watson, G.M.
Reproduction Notes: Electronic reproduction. [S.l.] : HathiTrust Digital Library, 2010. MiAaHDL
Description: 1 online resource (Pages: 39 :) PDF file.
Details: Master and use copy. Digital master created according to Benchmark for Faithful Digital Reproductions of Monographs and Serials, Version 1. Digital Library Federation, December 2002.
Series Title: ORNL, 3526.

Abstract:

Diffusion of beryllium-7 through polycrystalline unirradiated specimens of BeO was studied as a preliminary step to a study of diffusion in irradiated material. Beryllium-7 was deposited on one end of cylindrical specimens by exchange and adsorption from aqueous solution. The depth of penetration perpendicular to the surfaces of deposition was determined after annealing the specimens at pre-determined conditions. A simple lapping device of high precision was developed to determine penetration depths. For the polycrystalline cold-pressed and sintered BeO studied, the diffusion behavior between 1150 and 1800 deg C is described by the empirical relation: D = 2.49 x 10/sup -3/ exp -- (62.5 x 10/sup 3//RT) cm/sup 2//sec. A diffusion model is proposed based on vacancy migration which suggests identical activation energies for diffusion in both a and c directions in single crystals and predicts an activation energy of the correct order oi magnitude. Furthermore, the model p dicts that the frequency factor in the direction pexpendicular to the c axis should be about 50% higher than that parallel to the c axis. (auth).

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