Patent ID: 8980116
Filing Date: 2015-03-17
Classification: C04B,H01F

Abstract:
1. 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): wherein R represents at least one element selected from the group consisting of La, Ce, Pr, Nd and Sm and including La as an essential component, A represents Sr and/or Ba, and M represents at least one element selected from the group consisting of Co, Zn, Ni, Mn, Al and Cr and including Co as an essential component, x, m, y and z in formula (1) satisfying all of the conditions represented by the following formulas (2), (3), (4), (5) and (6): wherein the density of the sintered ferrite magnet is at least 5.05 g/cm 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,