PROBLEM TO BE SOLVED: To obtain a zirconia sintered body which exhibits high translucency by a short-time firing and can be produced without increasing man-hours and costs, and to obtain a mixture of hydrated zirconia particles and yttrium component for obtaining zirconia powder. Offer. A hydrated zirconia particle and a yttrium component are contained, and at least a part of the yttrium component is contained as an aggregate between a plurality of particles of the hydrated zirconia particle, and an aggregate region of the aggregate is equivalent to a circle. A mixture containing hydrated zirconia particles and yttrium components, which includes, in terms of diameter, 5 or more agglomerated regions having an equivalent circle diameter of 1 μm or more within a range of 60 μm×80 μm. [Selection diagram] None【課題】短時間焼成でジルコニア焼結体が高い透光性を示し、かつ工数やコストを掛けず作製することができる、ジルコニア粉末を得るための水和ジルコニア粒子とイットリウム成分とを含む混合物の提供。【解決手段】水和ジルコニア粒子とイットリウム成分とを含み、複数の前記水和ジルコニア粒子の粒子間に、前記イットリウム成分の少なくとも一部が凝集体として含まれ、前記凝集体の凝集領域を円相当径に換算した際に、円相当径が１μｍ以上の凝集領域が、６０μｍ×８０μｍの範囲に５個以上含まれる、水和ジルコニア粒子とイットリウム成分とを含む混合物。【選択図】なし
