610305.fig.0020
Figure 20: Concentration dependence of the lattice parameter 𝑎 of the 𝐹 𝑒 1 0 0 𝑥 𝐶 𝑜 𝑥 particles produced at an argon pressure of (1) 67, (2) 133, (3) 400, and (4) 1330 Pa.