Fig. 4.

Structure and physical properties of nanoporous cobalt. a XRD patterns of nanoporous cobalt prepared with various dealloying time at 773 K and 100 Pa. b Evolution of lattice parameter of nanoporous Co with different dealloying time at 773 K and 100 Pa. c Measurements of the coarsening exponents from the plots of ln[d(t)] vs ln(t) for low- and high-vacuum dealloying conditions. d The estimated activation energies for the nanoporous cobalt formation and coarsening at different dealloying conditions