610305.fig.0042
Figure 42: Mössbauer spectra for a bulk FeCr (2.36 at.%) alloy (a) and as-fresh nanoparticles of the same composition ((b)–(d)) of 𝐷 = 1 3 ± 2  nm size at different temperatures. (a) A thin foil, 293 K; (b) 293 K; (c) 80 K; (d) particles preliminarily aged at 80 K and subsequently warmed up to 293 K.