Abstract: An Nd-Fe-B sintered magnet which has 0.5 %/.degree.C. or more of temperature-coefficient of coercive force (iHc) and a composition that R=11-18 at % (R is one or more rare-earth elements except for Dy, with the proviso of 80 at % .ltoreq.(Nd+Pr)/R.ltoreq.100 at %), B=6-12 at %, and balance of Fe and Co (with the proviso of Co is 25 at % or less relative to the total of Co and Fe (including 0 % of Co)) and impurities, is improved to have 15 kOe or more of coercive force (iHc) by means of further containing 2-6 at % of V and modifying the minority phase such that B in excess of a stoichiometric composition of R.sub.2 Fe.sub.14 B compound-phase essentially does not form RFe.sub.4 B.sub.4 -compound minority phase but forms a finely dispersed V-T-B compound minority phase (T is fe, and in a case of containing Co, T is Fe and Co).

Abstract: When V is added to an Nd--Fe--B sintered magnet so as to modify the minority phase such that B in excess of a stoichiometric composition of R.sub.2 Fe.sub.14 B compound-phase, essentially does not form RFe.sub.4 B.sub.4 -compound minority phases but forms a finely dispersed V--T--B compound minority phase (T is Fe, and in a case containing Co, T is Fe and Co), the coercive force (iHc) is enhanced to 15 kOe or more but becomes very sensitive to heat treatment temperature. This drawback is eliminated by the addition of from 0.01 to 1 at % of Cu.