(JP2001010866-A)   NOVELTY - A ceramic sheet has a burr height of at most +/-100 microns on the periphery of the sheet and/or a dimple height of at most 100 microns on the surface of the sheet. The burr and the dimple heights are determined by irradiating the sheet with a laser beam to measure reflected light and three-dimensionally analyzing the reflected light with a laser optical three-dimensional profiling instrument.    USE - For planar solid oxide fuel cell (claimed), e.g. solid-electrolyte film, or as a thin film sheet having a thickness of 10-500 microns (claimed).    ADVANTAGE - The ceramic sheet is resistant to cracking and breakage. It has flat surfaces and highly stable qualities.    (JP2001089252-A)   NOVELTY - A ceramic sheet has a burr height of at most +/-100 microns on the periphery of the sheet and/or a dimple height of at most 100 microns on the surface of the sheet. The burr and the dimple heights are determined by irradiating the sheet with a laser beam to measure reflected light and three-dimensionally analyzing the reflected light with a laser optical three-dimensional profiling instrument.    USE - For planar solid oxide fuel cell (claimed), e.g. solid-electrolyte film, or as a thin film sheet having a thickness of 10-500 microns (claimed).    ADVANTAGE - The ceramic sheet is resistant to cracking and breakage. It has flat surfaces and highly stable qualities.    (JP2001163666-A)   NOVELTY - A ceramic sheet has a burr height of at most +/-100 microns on the periphery of the sheet and/or a dimple height of at most 100 microns on the surface of the sheet. The burr and the dimple heights are determined by irradiating the sheet with a laser beam to measure reflected light and three-dimensionally analyzing the reflected light with a laser optical three-dimensional profiling instrument.    USE - For planar solid oxide fuel cell (claimed), e.g. solid-electrolyte film, or as a thin film sheet having a thickness of 10-500 microns (claimed).    ADVANTAGE - The ceramic sheet is resistant to cracking and breakage. It has flat surfaces and highly stable qualities.