Ferrite sintered magnet, ferrite particles, bonded magnet, and rotating electrical machine

Ferrite particles having a ferrite phase having a magnetoplumbite-type crystal structure, containing:

• at least a metal element A, a metal element R, Fe, Co, Zn, and B,
• wherein the metal element A is at least one kind of element selected from the group consisting of Sr, Ba, Ca, and Pb, and essentially includes Ca,
• the metal R is at least one kind selected from the group consisting of Bi and rare-earth elements including Y, and essentially includes La,
• when an atomic ratio of the metal elements is expressed by Formula (1),
• r, x, y, and z satisfy the following Expressions (2) to (5),
• A1-rReFexCoyZnz (1)
• 0.40≤r≤0.70 (2)
• 8.20≤x≤9.34 (3)
• 0.05≤y≤0.50 (4)
• 0.01≤z≤0.10 (5)
• a content of Si is 0-0.60% by mass in terms of SiO2,
• the content of B is 0.1-0.70% by mass in terms of B2O3, and
• a coercive force HcJ of the ferrite particles in the form of a ferrite sintered magnet is 4000 Oe or more.