Ferrite sintered magnet, ferrite particle, bonded magnet and rotating electric machine

Ferrite particles comprising ferrite phases having a magnetoplumbite type crystal structure,

• wherein the ferrite particles comprise an element R, an element M, Fe, Co, B, Mn and Cr,
• the element R is at least one element selected from rare earth elements including Y,
• the element M is at least one element selected from the group consisting of Ca, Sr and Ba, with Ca being an essential element,
• when an atomic composition of metallic elements is represented by R1-xMxFem-yCoy,
• x, y and m satisfy formulae (1), (2) and (3):
• 0.2≤x≤0.8 (1)
• 0.1≤y≤0.65 (2)
• 3≤m<14 (3),
• a content of B is 0.1 to 0.4% by mass in terms of B2O3,
• a content of Mn is 0.15 to 1.02% by mass in terms of MnO, and
• a content of Cr is 0.02 to 2.01% by mass in terms of Cr2O3.

A bonded magnet comprising ferrite particles, the ferrite particles comprising ferrite phases having a magnetoplumbite type crystal structure,

• wherein the ferrite particles comprise an element R, an element M, Fe, Co, B, Mn and Cr,
• the element R is at least one element selected from rare earth elements including Y,
• the element M is at least one element selected from the group consisting of Ca, Sr and Ba, with Ca being an essential element,
• when an atomic composition of metallic elements is represented by R1-xMxFem-yCoy,
• x, y and m satisfy formulae (1), (2) and (3):
• 0.2≤x≤0.8 (1)
• 0.1≤y≤0.65 (2)
• 3≤m<14 (3),
• a content of B is 0.1 to 0.4% by mass in terms of B2O3,
• a content of Mn is 0.15 to 1.02% by mass in terms of MnO, and
• a content of Cr is 0.02 to 2.01% by mass in terms of Cr2O3.