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

A zirconia powder comprising 2.5 mol % or more and 3.5 mol % or less of yttria,

• wherein:
• the zirconia powder has a specific surface area of 5 m2/g or more and 20 m2/g or less, and includes crystal phases that have a monoclinic crystal phase ratio of 20% or more and 40% or less and a tetragonal crystal phase ratio of 60% or more and 80% or less;
• and
• when the zirconia powder is molded at a mold pressure of 0.8 t/cm2 and then sintered under a condition of 2 hours at 1450° C. to obtain a sintered body, the sintered body includes crystal phases that have a monoclinic crystal phase ratio of 1% or more and 3% or less, a tetragonal crystal phase ratio of 77% or more and 94% or less, and a cubic crystal phase ratio of 5% or more and 20% or less.