| 简介 |
PROBLEM TO BE SOLVED : To provide an Sr ferrite sintered magnet having magnetic characteristics superior in low cost without using a rare earth element and Co, and also to provide a motor and a generator.SOLUTION : Disclosed is an Sr ferrite sintered magnet containing a ferrite crystal particle having a crystal structure of a hexagonal system. This Sr ferrite sintered magnet contains at least Na, Ca and Si. Si, Na, Ca and Sr are contained in a two-grain grain boundary 40 sandwiched by two Sr ferrite crystal particles 20, 22. Sr concentration of the two-grain grain boundary is higher than that in the Sr ferrite crystal particle and the ratio between the Sr concentration with respect to the inside of the Sr ferrite crystal particle and the Sr concentration of the two-grain grain boundary is 1.40 or more.SELECTED DRAWING : Figure 2COPYRIGHT : (C)2017, JPO&INPIT |
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