| 摘要 |
PROBLEM TO BE SOLVED: To provide polycrystalline transparent Y<SB>2</SB>O<SB>3</SB>ceramics for electron beam fluorescence which is excellent in mass productivity and quality in image and by which superior quality in image can be obtained especially as an electron beam scintillator, and to provide its production method. SOLUTION: The polycrystalline transparent Y<SB>2</SB>O<SB>3</SB>ceramics for electron beam fluorescence consists of a polycrystalline sintered body whose main ingredient is Y<SB>2</SB>O<SB>3</SB>, which has a porosity of 0.1% or less, which has a mean crystalline particle diameter of 5-300μm and which contains a lanthanide element (Tb, Eu and the like). The method for producing the polycrystalline transparent Y<SB>2</SB>O<SB>3</SB>ceramics for electron beam fluorescence has a primary baking step to obtain a primary baked body by baking a formed body including Y<SB>2</SB>O<SB>3</SB>powders and lanthanide oxide powders at 1,500-1,800°C under an oxygen atmosphere and a secondary baking step to additionally bake the primary baked body at 1,600-1,800°C and 49-198 MPa. COPYRIGHT: (C)2008,JPO&INPIT
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