Process for production of scandia-stabilized zirconia sheet, scandia-stabilized zirconia sheet obtained by the process, and scandia-stabilized zirconia sintered powder

A process for production of a scandia-stabilized zirconia sheet, comprising the steps of:

• preparing a sintered scandia-stabilized zirconia powder, whose average particle diameter (De) determined by a transmission electron microscope is more than 0.3 μm and not more than 1.5 μm, whose average particle diameter (Dr) determined by a laser scattering method is more than 0.3 μm and not more than 3.0 μm, and whose ratio (Dr/De) of the average particle diameter determined by the laser scattering method to the average particle diameter determined by the transmission electron microscope is not less than 1.0 and not more than 2.5;
• preparing a slurry containing the scandia-stabilized zirconia sintered powder and a zirconia unsintered powder, wherein a percentage of the scandia-stabilized zirconia sintered powder to a sum of the scandia-stabilized zirconia sintered powder and the zirconia unsintered powder is not less than 2 mass % and not more than 40 mass %;
• forming the slurry into a greensheet;
• and
• sintering the greensheet.

A scandia-stabilized zirconia sintered powder, comprising:

• more than 0.3 μm and not more than 1.5 μm of an average particle diameter (De) determined by a transmission electron microscope;
• more than 0.3 μm and not more than 3.0 μm of an average particle diameter (Dr) determined by a laser scattering method;
• and
• not less than 1.0 and not more than 2.5 of a ratio (Dr/De) of the average particle diameter determined by the laser scattering method to the average particle diameter determined by the transmission electron microscope.