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Magnetic small‐angle scattering from molten elements iron, cobalt, and nickel
Author(s) -
Weber M.,
Knoll W.,
Steeb S.
Publication year - 1978
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889878014107
Subject(s) - scattering , nickel , cobalt , small angle scattering , small angle neutron scattering , neutron scattering , small angle x ray scattering , materials science , chemistry , analytical chemistry (journal) , condensed matter physics , crystallography , physics , metallurgy , optics , chromatography
Scattering of neutrons ( λ = 0.7 Å) from molten iron was carried out at 1600°C ( T melt = 1536°C; T Curie = 770°C) within the region of q = 0.2–2.0 Å −1 . A pronounced small‐angle scattering effect was observed for q ≤ 1.2 Å −1 , which is explained by magnetic scattering from spin fluctuations. A correlation length ξ = 2.7 Å was obtained. The plot of log ξ versus log [( T − T Curie )/ T Curie ] together with the ξ values obtained from solid iron shows that all measured ξ values can be described by the law ξ = 2.15 [( T − T Curie )/ T Curie ] −0.5 . Molten cobalt at 1550°C ( T melt = 1493°C; T Curie = 1127°C) yields a correlation length of 6.3 Å. Finally the results from a corresponding experiment on molten nickel at 1500°C ( T melt = 1454°C; T Curie = 358°C) are presented. However, the observed scattering effect is very small compared with that from the two other elements.