Activation energy is sometimes express edas (eV/atom), (e.g., as shown in Figure 5-15, which illustrates the diffusion coefficients of ions in different oxides). Convert eV/ atom to J/mole.

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(cm²/s) Diffusion coefficient ( 10-6 10-8 10-10 10-12 10-14 10-16 10-18 10-20 T T 3 Si in SiC (single) - 2500 Mg in MgO N in UN Co in CoO (air)- Zr in CaO-ZrO₂- O in Al2O3 (single) 2000 in graphite 1600 Ti in TiO₂- Cin SiC (single) Al in Al2O3 (poly) 0.5 U in UO2.00 5 eV/atom Temperature (°C) 1200 1000 1400 Cr in Cr₂O3 O in Nio 68Fe2 3204 (single) Yin Y₂0₂ -O in Al-03 (poly) Fe in Feo 950- O in Cr₂Os K in B-Al₂O O in Cao.142£0.8601 số. -O in NiO (46, = 0.2) Zn in ZnO Ca in Cao -O in CoO (30, = 0.2) 104 900 -O in Y₂Os Cu in Cu₂0 (po,= 1.4 x 10-4 atm) O in MgO 800 O in Cu₂0 (Po, = 0.2 atm) 9 700 U in UO200 Ni in NiO (po, = 1 atm) O in TiO₂ (air) -O in fused SiO₂ (po, = 1 atm) 0¹8 in ZnO (single) 10 11