| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a translucent ceramic comprising a crystal having a garnet structure synthesized from Y<SB>2</SB>O<SB>3</SB>(yttria) and Al<SB>2</SB>O<SB>3</SB>(alumina), wherein the addition of any form of metal elements except Y and Al is made needless by controlling the composition ratio of Y<SB>2</SB>O<SB>3</SB>and Al<SB>2</SB>O<SB>3</SB>to be raw materials. Ž<P>SOLUTION: High purity Y<SB>2</SB>O<SB>3</SB>powder and high purity Al<SB>2</SB>O<SB>3</SB>powder are used as starting raw materials and weighed to have a ratio of 35.5-37.5% Y<SB>2</SB>O<SB>3</SB>and 64.5-62.5% Al<SB>2</SB>O<SB>3</SB>and uniformly mixed by ball-mill mixing. After molded under cold hydrostatic pressure of 100-400 MPa, the mixture is sintered at ≥1,700°C for 2-16 hr under evacuated pressure. The resultant sintered body is a polycrystal body comprising YAG crystal single phase having about 100% relative density and has translucency in a wavelength region of 400-2,000 nm. The material is suitably used as a heat resistant optical window, a laser host material, an optical lens material and a plasma resistant optical window. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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