The　inherently　high　magnetic　anisotropy　and　nanoscale　grain　size　in　a　Sm5Co19　compound　result　in　an　intrinsic　coercivity　far　higher　than　those　of　known　Sm-Co　compounds　prior　to　orientation　treatment.　The　combination　of　ultrahigh　intrinsic　coercivity,　high　Curie　temperature　and　low　coercivity　temperature　coefficient　of　nanocrystalline　Sm5Co19　as　a　single　phase　material　shows　it　to　be　a　very　promising　compound　to　develop　outstanding　high-temperature　permanent　magnets.