The possibility of controlling Nd-422 phase dimension and morphology, both in the partially melted state and in the final superconducting matrix, was investigated. Nd–Ba–Cu–O samples were prepared by the melt powder melt growth (MPMG) technique. Precursor materials containing Nd as either Nd2O3 or Nd-422, formed during precursor quenching, were used. The role of Pt in Nd-422 refining was analyzed. The effect on Nd-422 nucleation and growth, of stoichiometries with increasing Nd-422 molar excesses (0%, 10%, 20%, and 40%) combined with different heating processes, up to the partially melted state, were examined. Uniformly distributed needle-like particles (1 μm diameter and 10–15 μm length) were obtained at 1120 °C and resulted in a further refined distribution trapped in completely processed samples.