TECHNOLOGY FOCUS - CERAMICS AND GLASS - Preferred Composition: The ceramic sheet comprises (mass %) dispersed reinforcing oxide (0.1-2), silica (at most 0.1), alkali metal oxides (at most 0.1), and zirconia ceramic partially stabilized with 2.8-4.5 mole% yttria. Preferred Process: The process may include molding a slurry containing 2.8-4.5 mole% yttria and 0.1-2 mass% dispersed reinforcing oxides to the ceramic green sheet. Preferred Properties: The ceramic sheet may have a waviness height of at most 100 microns on the surface of the sheet. The average and the maximum grain sizes on the surface of the sheet are 0.1-0.4 microns and 0.4-0.8 microns, respectively and the coefficient of variation is at most 30 %. The grain size is determined by scanning electron microscopic observation. The solid component of the slurry has an average particle diameter (50 volume % diameter) of 0.05-0.5 microns, a 90 volume % diameter of 0.5-2 microns, and a critical diameter (100 volume % diameter) of at most 3 microns. The powder containing at least 50 mass % organic powder has an average particle diameter of 0.3-100 microns.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Compound: The dispersed reinforcing oxide is an oxide of Group 4A elements, Group 5A elements, Group 3B elements, or Group 4B elements. EXAMPLE - An alumina green sheet was cut to 120 mm x 120 mm square sheet using a dual blade unit having theta of 51 degrees, theta1 of 25.5 degrees, and theta2 of 25.5 degrees. The cut green sheet was placed on an alumina setter and was baked at 1575 degrees C for 3 hours to yield 100 mm x 100 mm square alumina sheet having a thickness of 630 microns. The surface of the resulting sheet was irradiated with a laser beam to measure a reflected light. Results showed maximum burr height of 68 microns, dimple height of 50 microns, and waviness height of 100 microns. It exhibited no cracking after 10 times of load-applying test at 1000 degrees C using a 0.1 kgf/cm2 or 0.5 kgf/cm2 load.