公开(公告)号：US5569445A

公开(公告)日：1996-10-29

申请号：US368203

申请日：1994-12-29

申请人： Yoshiki Fukatsu ,  Shinji Nakahara ,  Youichi Yamada ,  Hideji Yamamoto ,  Tatsuya Hida ,  Mizuho Wada

发明人： Yoshiki Fukatsu ,  Shinji Nakahara ,  Youichi Yamada ,  Hideji Yamamoto ,  Tatsuya Hida ,  Mizuho Wada

IPC分类号： C01G49/06 ,  G11B5/706 ,  G11B5/708 ,  C01G49/02

CPC分类号： G11B5/70642 ,  C01G49/06 ,  G11B5/70615 ,  G11B5/708 ,  C01P2002/10 ,  C01P2002/70 ,  C01P2004/03 ,  C01P2004/10 ,  C01P2004/54 ,  C01P2004/62 ,  C01P2006/12 ,  C01P2006/42

摘要： Disclosed herein is fine acicular .alpha.-ferric oxide which has the crystallite diameter (D.sub.1014) in the direction perpendicular to the (1014) plane and the crystallite diameter (D.sub.1120) in the direction perpendicular to the (1120) plane such that their ratio D.sub.1014 /D.sub.1120 is in the range of 1-2, and also has a specific surface area of 40-50 m.sup.2 g. Disclosed also herein is fine acicular .alpha.-ferric oxide which has the crystallite diameter (D.sub.1014) in the direction perpendicular to the (1014) plane and the crystallite diameter (D.sub.1120) in the direction perpendicular to the (1120) plane such that their ratio D.sub.1014 /D.sub.1120 is the range of 1-2, and also has an average aspect ratio of 10-15 and a specific surface area of 20-40 m.sup.2 /g. They are produced by wet process including the step of hydrothermal reaction.

摘要翻译： 本文公开了在垂直于（10 + E，ovs 1 + EE 4）面的方向上具有微晶直径（D10 + E，ov1 + EE4）的细针状α-氧化铁和微晶直径（D11 + E，ovs 2 + EE 0）在垂直于（11 + E，ovs 2 + EE 0）平面的方向上使得它们的比率D10 + E，ov1 + EE4 / D11 + E，ov2 + EE0 在1-2的范围内，还具有40-50m 2 g的比表面积。 此处还公开了在垂直于（10 + E，ovs 1 + EE 4）面和微晶直径（D11）的方向上具有微晶直径（D10 + E，ov1 + EE4）的精细针状α-氧化铁 + E，ovs 2 + EE 0）在垂直于（11 + E，ovs 2 + EE 0）平面的方向上使得它们的比率D10 + E，ov1 + EE4 / D11 + E，ov2 + EE0 为1-2的范围，平均纵横比为10-15，比表面积为20-40m 2 / g。 它们通过湿法制备，包括水热反应步骤。