| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an inexpensive ferrite magnet exhibiting excellent magnet characteristics and having an inexpensive magnetoplumbite crystal structure, and to provide its producing process. <P>SOLUTION: The ferrite magnet is composed of a single phase of magnetoplumbite crystal structure represented by a formula (Sr<SB>1-x</SB>A<SB>x</SB>)O-n[(Fe<SP>3+</SP><SB>1-y</SB>Mg<SP>2+</SP><SB>y</SB>)<SB>2</SB>O<SB>3</SB>], where A is at least one kind being selected from rare earth elements, x, y and n represent mol ratios in the ranges of 0<x≤0.6, 0<y≤0.05, and 6.0<n≤6.6. In the producing process of the ferrite magnet, material powders of SrCO<SB>3</SB>, Fe<SB>2</SB>O<SB>3</SB>, A<SB>2</SB>O<SB>3</SB>and MgO are weighed and mixed and then calcinated under reducing atmosphere or in the atmosphere, the resulting powder is subjected to wet molding or dry molding and sintered under reducing atmosphere to form a single phase of magnetoplumbite crystal structure represented by the above-mentioned formula (Sr<SB>1-x</SB>A<SB>x</SB>)O-n[(Fe<SP>3+</SP><SB>1-y</SB>Mg<SP>2+</SP><SB>y</SB>)<SB>2</SB>O<SB>3</SB>]. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
