Fine acicular .alpha.-ferric oxide and production thereof

Details Fine acicular .alpha.-ferric oxide and production thereof Fine acicular .alpha.-ferric oxide and production thereof

1994-12-29

1996-10-29

Bos, Steven

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C01G 4902

Patent

active

055694454

ABSTRACT:
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.

REFERENCES:
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patent: 4414196 (1983-11-01), Matsumoto et al.
patent: 4774072 (1988-09-01), Arndt et al.
patent: 4826671 (1989-05-01), Arndt et al.
patent: 4913890 (1990-04-01), Arndt et al.
Copy of European Search Report dated 8 Jun. 1995.

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