Fig. 1: X-ray Diffraction analysis.
From: Synergistic proton conduction via Ca-vacancy coupled with Li+-bridge in Ca5(PO4)3OH

(A) XRD patterns of Ca5(PO4)3OH, Ca5(PO4)3OH-K, Ca5(PO4)3OH-Li and Ca5(PO4)3OH-H(Li). (B) Refined XRD patterns of Ca5(PO4)3OH, Ca5(PO4)3OH-K, Ca5(PO4)3OH-Li and Ca5(PO4)3OH-H(Li).