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Tetragonal CuMnAs was the first antiferromagnet where reorientation of theN\'eel vector was reported to occur by an inverse spin galvanic effect. Acomplicating factor in the formation of phase-pure tetragonal CuMnAs is theformation of an orthorhombic phase with nearly the same stoichiometry.Pure-phase tetragonal CuMnAs has been reported to require an excess of Cu tomaintain a single phase in traditional solid state synthesis reactions. Here weshow that subtle differences in diffraction patterns signal pervasiveinhomogeneity and phase separation, even in Cu-rich Cu$_{1.18}$Mn$_{0.82}$As.From calorimetry and magnetometry measurements, we identify two transitionscorresponding to the N\'eel temperature (T$_N$) and an antiferromagnet to weakferromagnet transition in Cu$_{1.18}$Mn$_{0.82}$As andCuMn$_{0.964}$As$_{1.036}$. These transitions have clear crystallographicsignatures, directly observable in the lattice parameters upon in-situ heatingand cooling. The immiscibility and phase separation could arise from aspinoidal decomposition that occurs at high temperatures, and the presence of aferromagnetic transition near room temperature warrants further investigationof its effect on the electrical switching behavior.

High-resolution diffraction reveals magnetoelastic coupling and coherent phase separation in tetragonal CuMnAs