Magnetic Properties of FexO as Related to the Defect Structure
作者:
F. B. Koch,
M. E. Fine,
期刊:
Journal of Applied Physics
(AIP Available online 1967)
卷期:
Volume 38,
issue 3
页码: 1470-1471
ISSN:0021-8979
年代: 1967
DOI:10.1063/1.1709672
出版商: AIP
数据来源: AIP
摘要:
The magnetic properties of FexO with long‐range order of defects was studied. The crystal structure appears to consist of periodically spaced complexes of vacant octahedral and occupied tetrahedral sites, with most of the octahedral ions in an ideal NaCl‐type environment. The Ne´el temperature, determined from measurements of susceptibility and modulus, increases very slightly asxis decreased. Octahedral‐tetrahedral ion exchange interactions are proposed to account for the increase inTN. The molar susceptibility obeys a Curie‐Weiss law, &khgr; = 3.56/(T+136). With &thgr; = 136°K andTNabout 200°K, &thgr;/TNis less than one. According to a treatment by Van Vleck one expects &thgr;/TNgreater than one for negative first‐near‐neighbor and second‐near‐neighbor interactions. A positive first‐near‐neighbor interaction may possibly arise through double exchange between Fe2+and Fe3+.
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