| 摘要 |
A sintered ferrite magnet having a ferrite phase with a hexagonal structure as the main phase, wherein the composition of the metal elements composing the main phase is represented by the following general formula (1):
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒR x Ca m A 1-x-m (Fe 12-y M y )z:€ƒ€ƒ€ƒ€ƒ€ƒ(1)
x, m, y and z in formula (1) satisfying all of the conditions represented by the following formulas (2)-(6): 0.2 ‰¤ x ‰¤ 0.5 0.13 ‰¤ m ‰¤ 0.41 0.7 �¢ x - m ‰¤ 0.15 0.18 ‰¤ yz ‰¤ 0.31 9.6 ‰¤ 12 �¢ z ‰¤ 11.8 and wherein the density of the sintered ferrite magnet is at least 5.05 g/cm 3 , and the crystal grains of the sintered ferrite magnet satisfy all of the conditions represented by the following formulas (7) and (8), where L µm is the average for the maximum value and S µm is the average for the minimum value among the diameters passing through the center of gravity of each grains in the crystal cross-section parallel to the c-axis direction of hexagonal structures. L ‰¤ 0.95 1.8 ‰¤ L / S ‰¤ 2.5 |
