Positron trapping and self-diffusion activation energies in chromium

The EU programme for modelling radiation effects in fusion reactor materials: An overview of recent advances and future goals

“…Vacancies migrate much slower in chromium than in iron [13,21] (the energy of migration of a vacancy in chromium is 0.91 eV compared to 0.67 eV in iron), in striking agreement with observations [22] showing that the activation energy for self-diffusion in pure chromium is 3.51 ± 0.13 eV, compared with the predicted value of 3.55 eV [9,10,15] (the activation energy for selfdiffusion is the sum of vacancy formation and migration energies). In FeCr alloys migration of vacancies is influenced by Cr atoms, with the maximum of the interdiffusion coefficient occurring at $13% Cr [23].…”

Solubility and vacancy-mediated inter-diffusion in the Zr-Nb-Cr system

“…The self-diffusivity of Cr and Nb, calculated considering just the vacancy exchange mechanism, and using vacancy formation entropy values of 2.25 k B and 2.2 k B [51] respectively, are shown in Fig 2 . The self-diffusivity results are in excellent agreement with experimental bulk-diffusivity results [52,53]. Literature available suggested that the self diffusion of Cr can be represented by mono-vacancy diffusion up to 1700-2000 K [54][55][56][57]. The experimental results reported for Nb self diffusion account for both monovacancy and divacancy diffusion.…”

Thermal Vacancies in High-Entropy Alloys

“…Table 2 Assessed RedlichKister parameters (J mol ¹1 ) used in the present work: CoCr, 35) CoFe, 36) CoMn, 37) CoNi, 38) CrFe, 39,40) Cr Mn, 41) CrNi, 42) FeMn, 43) FeNi, 44) and MnNi. 45) Experimental data [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] Average Calculations [33][34][35] Vacancy formation enthalpy,…”