Radiation Enhanced Porosity and Roughness of Materials Page: 4 of 7
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lithium absorption in other samples after bombardment with the same ions, energies and fluences.
The lithium absorption was carried out at 700*C in a molten 99.6% lithium chloride bath for a
duration of one hour. The near surface concentration profile of lithium in these samples was
measured by Nuclear Reaction Analysis (RNA). Alpha particles from the Li(p, 2a) (Q=1 7.256
MeV) reaction were observed from the surface to a depth of about 10 gm below the surface of the
GPC, beyond which the energy of the protons is insufficient to react with lithium. A 100
nanoampere 1.03 MeV proton beam and a silicon surface detector, at a back angle of 1700 were
used to perform the NRA.
RESULTS AND DISCUSSIONS
Fig. 3 shows that the surfaces of all samples become rough after ion bombardment. Samples
prepared at 700*C presented greater RMS roughness than for samples prepared at 1500*C. This
probably is due to GPC's hardness and purity, both of which increase with heat treatment
temperatures. For all ions there is a specific fluence value for which the roughness tends to decrease
as the fluence is increased.
500 A-Au- 7OC
---0 - 700 C
400\-- o -1500c
C +- C - 7C
W-- C - 1500 C
U300 - Si- 5o'Oc
C- Si- 700 C -
0 - 700'C Virgin GPC
1500 C Virgin GPC
1E13 1E14 1E15 1E16
Fig. 3: RMS roughness of GPC as a function of fluence after bombardment with the ion shown.
(See text for ion energies).
Fig. 4 shows the AFM surface profile of the 700*C GPC sample without any bombardment to be
compared with the texture obtained for the oxygen bombarded sample as is shown in Fig. 5. For
these samples AFM showed a specific texture, which presented 40 pm width regions, separated by
10-30 pm gaps. For fluences higher than 2.8x103 oxygen ions/cm2 the roughness decreased.
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Evelyn, A.L.; Rodrigues, M.G.; Ila, D.; Zimmerman, R.L.; Poker, D.B. & Hensley, D.K. Radiation Enhanced Porosity and Roughness of Materials, article, April 24, 2000; Tennessee. (digital.library.unt.edu/ark:/67531/metadc724918/m1/4/: accessed August 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.