Figure15

Figure 15. Bond thermal expansion (top panels) and parallel MSRDs (bottom panels) of the M-M second-shell distance in Cu$$ _{2} $$O (left panels) and Ag$$ _{2} $$O (right panels), for different constraints in the fitting procedure (for more details, see Ref.^[35]). Closed and open symbols refer, respectively, to intra-tetrahedra (edges of M$$ _{4} $$O tetrahedra) and inter-tetrahedra M-M distances. The intra-tetrahedra contribution to NTE observed by EXAFS cannot be explained in terms of RUMs. Figure taken from Ref.^[35]. © APS Publishing. Reproduced with permission. All rights reserved.