High pressure in-plane structural study of lithium and cesium highly saturated GICS

The compressibility of the high density alkali metal GICs CsC4 and LiC2 are relatively close to that of the corresponding classical phases CsC8 acid LiC6. The in-plane structure study allows the separate determination of the variation of each parameter. It shows a fairly high sensitivity of the c axis parameter under high pressure, which confirms the splitting of the metallic layer. On the other hand, the in-plane parameters vary independently, which reveals unsymmetry in the unit cell and proves the structure and the composition Li27C72 for the first stage saturated compound of lithium.