Calcined body and sintered body of zirconia

A sintered body of zirconia,

• wherein the zirconia contains (i) stabilizing element-containing zirconia or (ii) zirconia containing stabilizing element-containing zirconia and a coloring element,
• the sintered body has three or more regions stacked in a layered manner, two adjacent regions among the regions differ from each other in at least one of stabilizing element content and coloring element content, and
• a difference between a shrinkage ratio of the sintered body in a first region located at one end among the stacked regions and a shrinkage ratio of the sintered body in a second region located at the other end (difference in shrinkage ratio) is 0.4% or less.

A calcined body of a zirconia composition,

• wherein the zirconia composition contains (iii) a stabilizing element-containing zirconia composition having a necking structure or (iv) a zirconia composition containing stabilizing element-containing zirconia having a necking structure and a coloring element,
• the calcined body has three or more regions stacked in a layered manner, two adjacent regions among the regions differ from each other in at least one of stabilizing element content and coloring element content, and
• a difference between the stabilizing element content in a first region located at one end among the stacked regions and the stabilizing element content in a second region located at the other end is 2.0 mol % or less.

A calcined body of a zirconia composition,

• wherein the zirconia composition contains (iii) a stabilizing element-containing zirconia composition having a necking structure or (iv) a zirconia composition containing stabilizing element-containing zirconia having a necking structure and a coloring element,
• the calcined body has three or more regions stacked in a layered manner, two adjacent regions among the regions differ from each other in at least one of stabilizing element content and coloring element content, and
• a difference between a shrinkage ratio of the calcined body in a first region located at one end among the stacked regions and a shrinkage ratio of the calcined body in a second region located at the other end (difference in shrinkage ratio) is 0.4% or less.