Thermodynamic or DFT calculations assessing the relative stability of a mixture of the binary compounds versus a ternary phase could shed further light on this, but none have been published so far. Only Li3Sb0.5Bi0.5 has been synthesized before by melting the constituent metals. The lattice parameter was slightly lower than the one we found (6.625 Å vs. 6.653 Å) , and no traces of Li3Bi were reported, indicating that the synthesis route and temperature have a big influence on the outcome.