Temperature-dependent lifetimes of nonequilibrium Fe3+ ions in CoO from the Mossbauer effect

Bhide, V. G. ; Shenoy , G. K. (1966) Temperature-dependent lifetimes of nonequilibrium Fe3+ ions in CoO from the Mossbauer effect Physical Review, 147 (1). pp. 306-310. ISSN 0031-899X

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Official URL: http://prola.aps.org/abstract/PR/v147/i1/p306_1

Related URL: http://dx.doi.org/10.1103/PhysRev.147.306

Abstract

The lifetime of the nonequilibrium Fe3+ state in a CoO:Co57 source has been determined in the temperature range 78 to 1000° K. The intensity of the ferrous state is highly temperature-dependent and was hardly detectable above 800°K. The width of the nuclear excited level of the nonequilibrium state is determined by the nuclear decay time t and the atomic decay time θ(3). The expected changes in the linewidth of the nonequilibrium Fe3+ state in the Mossbauer spectra have been observed. The observed deviation of the temperature variation of the hf magnetic field at the nuclei of both Fe2+ and Fe3+ ions from that expected by the molecular-field theory may be due to a possible biquadratic exchange interaction in CoO, with j/J20.022.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:5004
Deposited On:18 Oct 2010 05:35
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