Multilayer coil component
A multilayer coil component that includes a multilayer body in which a plurality of insulating layers are stacked in a stacking direction and a coil inside the multilayer body, and outer electrodes that are on surfaces of the multilayer body and are electrically connected to the coil. The insulating layers include a spinel-structure ferrite phase and a ZnFe(BO 3 )O-type crystalline phase.
1. A multilayer coil component comprising:
a multilayer body in which a plurality of insulating layers are stacked in a stacking direction, and a coil inside the multilayer body; and
outer electrodes that are on surfaces of the multilayer body and are electrically connected to the coil,
wherein the insulating layers include a spinel-structure ferrite phase and a ZnFe(BO 3 )O-type crystalline phase.
2. The multilayer coil component according to claim 1 , wherein
a coefficient of linear expansion of the insulating layers at 700° C. is 9×10 −6 /K or higher.
3. The multilayer coil component according to claim 2 , wherein
the coefficient of linear expansion of the insulating layers at 700° C. is 10×10 −6 /K or higher.
4. The multilayer coil component according to claim 3 , wherein
the insulating layers further include a forsterite crystalline phase.
5. The multilayer coil component according to claim 4 , wherein
the insulating layers further include a quartz crystalline phase.
6. The multilayer coil component according to claim 4 , wherein
the ferrite phase is a spinel-structure magnetic phase containing at least Fe, Ni, Zn, and Cu, and
the insulating layers include a non-magnetic phase containing at least the ZnFe(BO 3 )O-type crystalline phase and Si.
7. The multilayer coil component according to claim 3 , wherein
the insulating layers further include a quartz crystalline phase.
8. The multilayer coil component according to claim 3 , wherein
the ferrite phase is a spinel-structure magnetic phase containing at least Fe, Ni, Zn, and Cu, and
the insulating layers include a non-magnetic phase containing at least the ZnFe(BO 3 )O-type crystalline phase and Si.
9. The multilayer coil component according to claim 2 , wherein
the insulating layers further include a forsterite crystalline phase.
10. The multilayer coil component according to claim 9 , wherein
the insulating layers further include a quartz crystalline phase.
11. The multilayer coil component according to claim 9 , wherein
the ferrite phase is a spinel-structure magnetic phase containing at least Fe, Ni, Zn, and Cu, and
the insulating layers include a non-magnetic phase containing at least the ZnFe(BO 3 )O-type crystalline phase and Si.
12. The multilayer coil component according to claim 2 , wherein
the insulating layers further include a quartz crystalline phase.
13. The multilayer coil component according to claim 12 , wherein
the ferrite phase is a spinel-structure magnetic phase containing at least Fe, Ni, Zn, and Cu, and
the insulating layers include a non-magnetic phase containing at least the ZnFe(BO 3 )O-type crystalline phase and Si.
14. The multilayer coil component according to claim 2 , wherein
the ferrite phase is a spinel-structure magnetic phase containing at least Fe, Ni, Zn, and Cu, and
the insulating layers include a non-magnetic phase containing at least the ZnFe(BO 3 )O-type crystalline phase and Si.
15. The multilayer coil component according to claim 1 , wherein
the insulating layers further include a forsterite crystalline phase.
16. The multilayer coil component according to claim 15 , wherein
the insulating layers further include a quartz crystalline phase.
17. The multilayer coil component according to claim 15 , wherein
the ferrite phase is a spinel-structure magnetic phase containing at least Fe, Ni, Zn, and Cu, and
the insulating layers include a non-magnetic phase containing at least the ZnFe(BO 3 )O-type crystalline phase and Si.
18. The multilayer coil component according to claim 1 , wherein
the insulating layers further include a quartz crystalline phase.
19. The multilayer coil component according to claim 18 , wherein
the ferrite phase is a spinel-structure magnetic phase containing at least Fe, Ni, Zn, and Cu, and
the insulating layers include a non-magnetic phase containing at least the ZnFe(BO 3 )O-type crystalline phase and Si.
20. The multilayer coil component according to claim 1 , wherein
the ferrite phase is a spinel-structure magnetic phase containing at least Fe, Ni, Zn, and Cu, and
the insulating layers include a non-magnetic phase containing at least the ZnFe(BO 3 )O-type crystalline phase and Si.