Concentration-dependent hyperfine field at Fe nuclei in FeCr alloy. Quenched bulk alloy: ∆ [84]; + [92]; ⚫  [73]; × [93]; (5 K) [94]; ▼ [95]; ◊ [96]; ∇ (40 K) [97]; O (4.2 K) [97]; □ (1.7 K) [97]. Nanoparticles: ■ ~14 nm particles [84]; ◆ 21 nm particles at T = 4.2 K [98]; visual curves: 1, bulk alloy (300 K); 2, nanoparticles (300 K); 3, bulk alloy (4.2 K); 4, averaged data for the bulk alloy at 4.2 and 1.7 K; and 5, averaged data for the bulk alloy at 300 and 40 K.