Magnetic properties of goethite in radulae of limpets

Author

Huang, C.M. ; Li, C.-W. ; Deng, M.C. ; Chin, T.S.

Author_Institution

Tsing Hua Univ., Hsinchu, Taiwan

Volume

28

Issue

5

fYear

1992

fDate

9/1/1992 12:00:00 AM

Firstpage

2409

Lastpage

2411

Abstract

Radular formation in the limpet, Acmae striata, was explored by magnetic measurements, Mossbauer spectroscopy, X-ray diffraction, and electron microscopy. It was found that, in premature radula, acicular goethite alone precipitated in the matrix-mediated manner. It grows extensively to be interlocking masses in a cusp region of detected in the porous region. A new mineral phase, hisingerite, was identified to coexist with goethite and an amorphous silicate. The goethite has a relative susceptibility of 2.5×10^-5. An oxidation-reduction turned the goethite to gamma-Fe₂O₃ with a coercivity of 250 Oe and a saturation magnetization of only 6.65 emu/g due to the dilution effect of coexisting silicates

Keywords

Mossbauer effect; X-ray diffraction examination of materials; antiferromagnetic properties of substances; biomagnetism; coercive force; iron compounds; magnetic susceptibility; minerals; Acmae striata; Fe₂Si₂O₅(OH)₅.2H ₂O phase; Fe₂Si₂O₅(OH)₅H₂O; Mossbauer spectroscopy; X-ray diffraction; amorphous silicate; antiferromagnetic structure; coercivity; gamma Fe₂O₃; goethite; hisingerite; magnetic properties; magnetic recording materials; mineral phase; oxidation-reduction; radulae of limpets; relative susceptibility; saturation magnetization; Amorphous materials; Coercive force; Electron microscopy; Magnetic force microscopy; Magnetic properties; Magnetic variables measurement; Minerals; Saturation magnetization; Spectroscopy; X-ray diffraction;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.179508

Filename

179508