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Mössbauer Study of β‐ and δ‐FeOOH and their Disintegration Products
Author(s) -
Dézsi I.,
Keszthelyi L.,
Kulgawczuk D.,
McInár B.,
Eissa N. A.
Publication year - 1967
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19670220234
Subject(s) - octahedron , mössbauer spectroscopy , paramagnetism , curie temperature , quadrupole splitting , ion , chemistry , crystallography , quadrupole , tetrahedron , mössbauer effect , analytical chemistry (journal) , inorganic chemistry , ferromagnetism , condensed matter physics , crystal structure , physics , atomic physics , organic chemistry , chromatography
β‐FeOOH and δ‐FeOOH are studied by Mössbauer effect measurements. The Néel point of β‐FeOOH is T N = (295 ± 4) °K. Above this temperature the material is paramagnetic with quadrupole splitting and it decomposes to α‐Fe 2 O 3 at 670 °K. The transition at this temperature takes 12 hours. The two internal magnetic fields observed in δ‐FeOOH are found to correspond to Fe 3+ ions in octahedral and tetrahedral positions. δ‐FeOOH decomposes to intermediate products at 370 °K below its Curie Temperature and it disintegrates to α‐Fe 2 O 3 at approximately 510 °K.