Zirconia powder, zirconia sintered body, and method for producing zirconia sintered body

A zirconia powder comprising a stabilizer, wherein

• the stabilizer is CaO, Y2O3, Er2O3, or Yb2O3,
• when the stabilizer is Y2O3, a content of the Y2O3 based on an entire amount of the zirconia powder is 1.4 mol % or more and less than 2.0 mol %,
• when the stabilizer is Er2O3, a content of the Er2O3 based on an entire amount of the zirconia powder is 1.4 mol % or more and 1.8 mol % or less,
• when the stabilizer is Yb2O3, a content of the Yb2O3 based on an entire amount of the zirconia powder is 1.4 mol % or more and 1.8 mol % or less, and
• when the stabilizer is CaO, a content of the CaO based on an entire amount of the zirconia powder is 3.5 mol % or more and 4.5 mol % or less,
• in a range of 10 nm or more and 200 nm or less in a pore distribution based on a mercury intrusion method, a peak top diameter in a pore volume distribution is 20 nm or more and 120 nm or less, a pore volume is 0.2 ml/g or more and less than 0.5 ml/g, and a pore distribution width is 30 nm or more and 170 nm or less, and
• the zirconia powder includes a property of, upon being sintered under conditions at 1200° C. or higher and 1350° C. or lower and for 1 hour or more and 5 hours or less, producing a zirconia sintered body wherein a ratio of a monoclinic crystal phase contained in a crystal phase is 0.2% or more and 2.9% or less.