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METHOD FOR PRODUCING TRANSPARENT CERAMICS, THE TRANSPARENT CERAMICS, AND MAGNETO-OPTICAL DEVICE
To provide a method for manufacturing a transparent ceramic material consisting of a Tb-based complex oxide, having improved diffuse transmittance in the visible region and functioning as a magneto-optical part in a wide wavelength range from visible to NIR region.SOLUTION: A transparent ceramic material is obtained by: molding a source powder into a compact, wherein the source powder mainly comprises a rare earth oxide consisting of at least 40 mol% of terbium oxide and the balance of another rare earth oxide, and further comprises, as a sintering aid, at least one element oxide selected from a Group-II element and a Group-IV element; sintering the compact at a sintering temperature T (1,300°C≤T≤1,650°C) by heating from room temperature to predetermined temperature T1 (1,200°C≤T1≤T) at a rate of at least 100°C/h, and optionally heating from T1 at a rate of 1°C/h-95°C/h; and HIP-treating the sintered compact at 1,300-1,650°C. The transparent ceramic consists of a complex oxide sintered body having a crystal grain diameter of 0.5-2 μm.SELECTED DRAWING: Figure 1
【課題】可視域での拡散透過率を改善し、可視から近赤外領域に至る幅広い波長領域で磁気光学素子として機能するＴｂ系複合酸化物からなる透明セラミックスの製造方法を提供する。【解決手段】モル比率として酸化テルビウムが４０モル％以上、その他の希土類酸化物が残部である希土類酸化物を主成分とし、焼結助剤として第２族元素及び第４族元素から選ばれる少なくとも１つの元素の酸化物を含む原料粉末を用いて成形体を成形した後、該成形体を焼結温度Ｔ（１３００℃≦Ｔ≦１６５０℃）に加熱して焼結する際、室温から所定温度Ｔ１（１２００℃≦Ｔ１≦Ｔ）までの昇温速度を１００℃／ｈ以上とし、その所定温度Ｔ１から更に昇温する場合には昇温速度を１℃／ｈ以上９５℃／ｈ以下として昇温して焼結処理を行い、次いで１３００℃以上１６５０℃以下でＨＩＰ処理して結晶粒径が０．５μｍ以上２μｍ以下の複合酸化物焼結体からなる透明セラミックスを得る。【選択図】図１
METHOD FOR PRODUCING TRANSPARENT CERAMICS, THE TRANSPARENT CERAMICS, AND MAGNETO-OPTICAL DEVICE
To provide a method for manufacturing a transparent ceramic material consisting of a Tb-based complex oxide, having improved diffuse transmittance in the visible region and functioning as a magneto-optical part in a wide wavelength range from visible to NIR region.SOLUTION: A transparent ceramic material is obtained by: molding a source powder into a compact, wherein the source powder mainly comprises a rare earth oxide consisting of at least 40 mol% of terbium oxide and the balance of another rare earth oxide, and further comprises, as a sintering aid, at least one element oxide selected from a Group-II element and a Group-IV element; sintering the compact at a sintering temperature T (1,300°C≤T≤1,650°C) by heating from room temperature to predetermined temperature T1 (1,200°C≤T1≤T) at a rate of at least 100°C/h, and optionally heating from T1 at a rate of 1°C/h-95°C/h; and HIP-treating the sintered compact at 1,300-1,650°C. The transparent ceramic consists of a complex oxide sintered body having a crystal grain diameter of 0.5-2 μm.SELECTED DRAWING: Figure 1
【課題】可視域での拡散透過率を改善し、可視から近赤外領域に至る幅広い波長領域で磁気光学素子として機能するＴｂ系複合酸化物からなる透明セラミックスの製造方法を提供する。【解決手段】モル比率として酸化テルビウムが４０モル％以上、その他の希土類酸化物が残部である希土類酸化物を主成分とし、焼結助剤として第２族元素及び第４族元素から選ばれる少なくとも１つの元素の酸化物を含む原料粉末を用いて成形体を成形した後、該成形体を焼結温度Ｔ（１３００℃≦Ｔ≦１６５０℃）に加熱して焼結する際、室温から所定温度Ｔ１（１２００℃≦Ｔ１≦Ｔ）までの昇温速度を１００℃／ｈ以上とし、その所定温度Ｔ１から更に昇温する場合には昇温速度を１℃／ｈ以上９５℃／ｈ以下として昇温して焼結処理を行い、次いで１３００℃以上１６５０℃以下でＨＩＰ処理して結晶粒径が０．５μｍ以上２μｍ以下の複合酸化物焼結体からなる透明セラミックスを得る。【選択図】図１
METHOD FOR PRODUCING TRANSPARENT CERAMICS, THE TRANSPARENT CERAMICS, AND MAGNETO-OPTICAL DEVICE
透明セラミックスの製造方法、透明セラミックス並びに磁気光学デバイス
TANAKA KEITA (author) / AOKI SHINJI (author) / MAKIKAWA SHINJI (author)
2019-09-19
Patent
Electronic Resource
Japanese
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