Low-Temperature Recovery Spectra of Neutron-Irradiated Metals

Point-Defect Studies in Platinum by Electron Irradiation at Low Temperatures. I. Defect Production

“…They found their data to be consistent with T e =37 eV and p P = 7.5X10" 4 . These values are in reasonably good agreement with our values of T e =36 eV and PF = 6.0X10~4.…”

“…For example, in copper reasonable success has been achieved 12,13 , whereas in gold this procedure was found to be inadequate. 4 In platinum Burke et al 1 found for 55 eV <T m <90 eV that the agreement between theory and experiment (T e =37 eV, PF -7.5 X10~" 4 ) is approximately the same with either the normalization procedure (normalized at T m =54 eV) or the method used in this work. They found that above T m =90 eV the data are below the multiple displacement theory and at r m =130 eV the data are less than the simple displacement theory.…”

“…The correction procedure is identical to that in Ref. 4. The correction for electron straggling is small (<5%).…”

“…15 They pointed out that for closely related metals the threshold energy should increase with the ratio of Z 2 /ro, where Z is the atomic number and r 0 the lattice parameter. Using the value of T e = 35 eV for gold 4 we deduce T e = 35.5 eV for platinum. The semiempirical calculations of Anderson and Sigmund 16 using a Born-Mayer potential predict values of T d of 50 and 51 eV in the (100) and (110) directions for platinum.…”

“…These data lend themselves to an interpretation which is different from that given for the gold recovery data. 4 Thus it is desirable to investigate whether the displacement processes in platinum and gold are also fundamentally different. We first compare the dp/d<t> data presented here for platinum with the data for gold in Fig.…”