S 0 = 205 J/mol/K , and assume that oxygen behaves as an ideal gas and use C P = 7 2 k for the constantpressure specific heat capacity per diatomic molecule . The resulting "synthetically accessible" range of elemental chemical potentials defines a three-dimensional region of {µ O , µ Cl , µ Li } chemical-potential space with six vertices (fig. ). Within these six limiting conditions, we explicitly consider the maximally lithium-rich and lithium-poor conditions, which are labelled A and B, respectively, in fig.