Cobaltous Oxide (I): A Compact Single-Line Source
Mössbauer experiments using CoO sources usually show two lines at room temperature when used with a narrow unsplit absorber. These correspond to different chemical environments and have been identified with Fe2+ and Fe3+. By a combination of Mössbauer, X-ray, and chemical techniques, we have been able to prepare stopchiometric CoO sources which have only the Fe2+ component, or alternatively only the Fe3+ component, The Fe2+ component gives a narrow single line, with a recoil-free fraction at room temperature exceeding that of Co57-doped copper sources. The effective Mössbauer characteristic temperature for Fe2+ in CoO(I) was measured to be 510°K. By contrast the unsplit Fe3+ line associated with CoO(II) has a very broad line width and a Mössbauer characteristic temperature of only 320°K.Our Prescription for Co57O(I) should permit the fabrication of very strong, single-line, sources with minimum electronic absorption.
KeywordsLine Width Cobaltous Oxide Cobaltous Nitrate Gravimetric Determination Cobalt Metal
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