Fig. 2. Pressure-dependent in situ XRD.

(A) XRD patterns (Mo Kα radiation) of Ti₃C₂T_x collected in DAC at various pressures up to ≈5 GPa using water as pressure-transmitting medium (that is, a large excess of water). The red asterisk (*) denotes the (002) reflection of a small amount of residual Ti₃AlC₂. All other reflections are MXene {00l}. (B) Basal spacing d₀₀₁ as a function of external pressure for Ti₃C₂T_x in two experiments with different amounts of water: excess H₂O (blue circles) and a small amount of H₂O (black triangles). Note that the maximum expansion here is almost 2 Å smaller than those reported in Fig. 1.