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NO, the correct one is :
Phosphide is the name of the anion formed when Phosphorus gains 3 electrons.
Aluminum (or aluminium, if you're a Brit) phosphide.
Li3P it is an unstable solid the Lithium phosphide.
Iron phosphide may be one of the following compounds:
(di-)Iron phosphide, Fe2P
(tri-)Iron phosphide, Fe3P
And to complete the picture, monoiron phosphide, FeP.
The binary compound Ba3P2 stand for Barium Phosphide.