Figure 4. Chemical stability and mechanical properties. (A) AFM topography image of NACO0.2125 pellet; (B) Young’s modulus distribution of NACO0.2125 pellet; (C) Nyquist plots of exposed NACO0.2125; (D) XRD patterns of NACO0.2125 and exposed NACO0.2125 in dry air for 24 h.