DYNAMICS OF B-SUBLIMATION FROM BORON-DOPED GRAPHITE USB15

Authors
SCHWORER R GARCIAROSALES C ROTH J
Citation
R. Schworer et al., DYNAMICS OF B-SUBLIMATION FROM BORON-DOPED GRAPHITE USB15, Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 80-1, 1993, pp. 1468-1471
Citations number
11
Categorie Soggetti
Physics, Nuclear","Nuclear Sciences & Tecnology","Instument & Instrumentation
Journal title
Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms → ACNP
ISSN journal
0168583X
Volume
80-1
Year of publication
1993
Part
2
Pages
1468 - 1471
Database
ISI
SICI code
0168-583X(1993)80-1:<1468:DOBFBG>2.0.ZU;2-Y
Abstract
The diffusion and release of boron in USB15 at temperatures above 1700 K has been investigated. The boron depth distribution has been measur ed using the B-11(p,alpha0)Be-8 nuclear reaction after heating the sam ple for different times and at different temperatures. After prolonged heating a boron depleted carbon layer develops due to outdiffusion of boron in solid solution and the dissolution of the B4C precipitates. Additionally, the high temperature erosion of USB15 under 1 keV D+ bom bardment at a flux of 2 x 10(15) D+/cm2 s has been studied. The radiat ion enhanced sublimation (RES) is limited by the boron concentration a t the surface. A model which relates the reduction of RES to the surfa ce concentration of boron predicts a stronger suppression of RES for l arger ion fluxes.