Patent ID: 6737011
Filing Date: 2004-05-18
Classification: C01G,C01P,C04B,H01F

Abstract:
A method for producing a ferrite magnet having a basic composition represented by the following general formula:(A1âˆ’xRx)O.n[(Fe1âˆ’yMy)2O3] by atomic ratio, wherein A is Sr and/or Ba, R is at least one rare earth element including Y, M is at least one element selected from the group consisting of Co, Mn, Ni and Zn, and x, y and n are numbers meeting the following conditions:0.01&lE;x&lE;0.4, [x/(2.6n)]&lE;y&lE;[x/(1.6n)], and5&lE;n&lE;6 said ferrite magnet substantially having a magnetoplumbite crystal structure, said method comprising the steps of adding a compound of the R element and/or the M element at a percentage of more than 0 atomic % and 80 atomic % or less, on an element basis, at a step of uniformly mixing a compound of Sr and/or Ba with an iron compound;calcining the resultant uniform mixture; adding the remaining amount of said compound of the R element and/or the M element to the resultant calcined powder at a pulverization step thereof; and sintering the resultant mixture.