Ceramic electronic component comprising dielectric grains having a core-dual shell structure and method of manufacturing the same

1. A ceramic electronic component comprising:

a body including a dielectric layer and an internal electrode; and

an external electrode disposed on the body and connected to the internal electrode,

wherein the dielectric layer includes a plurality of dielectric grains, wherein

at least one of the plurality of dielectric grains has a core-dual shell structure having a core and a dual shell,

the dual shell includes a first shell surrounding at least a portion of the core, and a second shell surrounding at least a portion of the first shell,

the dual shell includes at least two different types of rare earth elements R1 and R2, and

R2 S1 /R1 S1 is 0.01 or less, and R2 S2 /R1 S1 is 0.5 to 3.0, and R1 S2 /R1 S1 is 0.1 to 1.3, where R1 S1 and R1 S2 denote concentrations of R1 included in the first shell and the second shell, respectively, and R2 S1 and R2 S2 denote concentrations of R2 included in the first shell and the second shell, respectively.

2. The ceramic electronic component of claim 1 , wherein

a distance corresponding to a thickness of the second shell along a straight line connecting α and β is greater than 4% to less than 25% of a distance between α and β, where a denotes a center of the core-dual shell structure in the cross-section of the core-dual shell structure, and β denotes a point on a surface of the second shell, farthest from α.

3. The ceramic electronic component of claim 2 , wherein a distance corresponding to a thickness of the first shell along the straight line connecting α and β is 5% or more to 30% or less.

4. The ceramic electronic component of claim 2 , wherein a distance corresponding to a thickness of the first shell along the straight line connecting α and β is 0.5 or more to 1.5 or less times the distance corresponding to a thickness of the second shell along the straight line connecting α and β.

5. The ceramic electronic component of claim 1 , wherein the first shell of the core-dual shell structure is disposed to cover 90% or more of a surface area of the core, and

the second shell of the core-dual shell structure is disposed to cover 90% or more of a surface area of the first shell.

6. The ceramic electronic component of claim 1 , wherein at least one of the plurality of dielectric grains has a core-shell structure having the core and a shell.

7. The ceramic electronic component of claim 1 , wherein a number of dielectric grains having the core-dual shell structure is 50% or more of a number of the plurality of dielectric grains.

8. The ceramic electronic component of claim 1 , wherein the dielectric layer includes one or more of BaTiO 3 , (Ba,Ca)(Ti,Ca)O 3 , (Ba,Ca)(Ti,Zr)O 3 , Ba(Ti,Zr)O 3 , or (Ba,Ca)(Ti,Sn)O 3 as a main component.

9. The ceramic electronic component of claim 8 , wherein a sum of contents of R1 and R2 included in the dielectric layer is 0.1 to 15 mole relative to 100 moles of the main component.

10. The ceramic electronic component of claim 8 , wherein the dielectric layer further includes at least one of Mn, Cr, Ba, Si, Al, Mg, or Zr, as a minor component.

11. The ceramic electronic component of claim 8 , wherein the dielectric layer includes one or more selected from the group consisting of BaTiO 3 , (Ba 1-x Ca x ) (Ti 1-y Ca y )O 3 (where 0≤x≤0.3, 0≤y≤0.1), (Ba 1-x Ca x ) (Ti 1-y Zr y )O 3 (where 0≤x≤0.3, 0≤y≤0.5), Ba (Ti 1-y Zr y )O 3 (where 0<y≤0.5), or (Ba 1-x Ca x ) (Ti 1-y Sn y )O 3 (where 0≤x≤0.3, 0≤y≤0.1).

12. The ceramic electronic component of claim 1 , wherein R1 comprises at least one selected from the group consisting of lanthanum (La), yttrium (Y), actinium (Ac), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), and ruthenium (Ru), and

R2 comprises at least one selected from the group, other than the element included in R1.

13. The ceramic electronic component of claim 1 , wherein R2 has a larger ionic radius than R1.

14. A ceramic electronic component comprising:

a body including a dielectric layer and an internal electrode; and

an external electrode disposed on the body and connected to the internal electrode,

wherein the dielectric layer includes a plurality of dielectric grains, wherein

at least one of the plurality of dielectric grains has a core-dual shell structure having a core and a dual shell,

the dual shell includes a first shell surrounding at least a portion of the core, and a second shell surrounding at least a portion of the first shell,

the dual shell includes at least two different types of rare earth elements R1 and R2, and

R2 S1 /R1 S1 is 0.01 or less and R2 S2 /R1 S1 is 0.5 to 3.0, where R1 S1 and R1 S2 denote concentrations of R1 included in the first shell and the second shell, respectively, and R2 S1 and R2 S2 denote concentrations of R2 included in the first shell and the second shell, respectively

wherein a distance corresponding to a thickness of the second shell along a straight line connecting α and β is greater than 4% to less than 25% of a distance between α and β, where α denotes a center of the core-dual shell structure in the cross-section of the core-dual shell structure, and β denotes a point on a surface of the second shell, farthest from α.

15. The ceramic electronic component of claim 14 , wherein a distance corresponding to a thickness of the first shell along the straight line connecting α and β is 5% or more to 30% or less.

16. The ceramic electronic component of claim 14 , wherein a distance corresponding to a thickness of the first shell along the straight line connecting α and β is 0.5 or more to 1.5 or less times the distance corresponding to a thickness of the second shell along the straight line connecting α and β.