Patent ID: 9530548
Filing Date: 2016-12-27
CPC Classification: C01G,C01P,C04B,H01F,Y10T

Claim Text:
1. A method for producing a sintered Sr ferrite magnet, wherein Sr ferrite particles, which are obtained by a method for producing Sr ferrite particles for sintered magnets, are used, the method for producing Sr ferrite particles for sintered magnets, comprising: a mixing step of mixing an iron compound, a strontium compound, and an alkali metal compound which includes at least one kind of element selected from K and Na as a constituent element and which does not include Cl and S as the constituent element to prepare a mixture; and a calcining step of firing the mixture at 850 to 1100° C. to obtain Sr ferrite particles in which an average particle size of primary particles is 0.2 to 1.0 μm, wherein in the mixing step, the alkali metal compound is mixed in such a manner that a total amount of K and Na becomes 0.03 to 1.05% by mass in terms of K wherein the sintered Sr ferrite magnet contains crystal grains of M-type Sr ferrite having a hexagonal structure as a main component.