Publication Date:
2024-03-01
Description:
Iron-manganese nodules from the ocean floor have been extensively studied. But, because of the fine grain size of the particles of the nodules, structural identification by X-ray and electron diffraction techniques is difficult and the mineralogy of the iron oxide phase has not been well characterized. The observation of the Mössbauer spectrum-in which each nucleus absorbs gamma-rays independently-is not limited by particle size in the same way as is the observation of Bragg peaks in diffraction measurements, in which radiation must be scattered coherently from a large number of atoms. The magnetic hyperfine splitting in the Mössbauer spectrum of magnetic materials is affected, however, when the particles are so small that they become superparamagnetic. We describe here an investigation using the 57Fe Mössbauer effect of two iron-manganese nodules in which the iron oxide phase could not be detected by X-ray or electron diffraction.
Keywords:
Chromium; Cobalt; Copper; D16; D6243; D6273; Description; Discovery (1962); Dredge, rock; DRG_R; Event label; Gulf of Aden; Indian Ocean, Carlsberg Ridge; Iron; Lead; Manganese; Minerals, surface area; Molybdenum; Mössbauer spectroscopy; Nickel; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Sample ID; Silicon dioxide; Titanium; Vanadium; Zinc; Zirconium
Type:
Dataset
Format:
text/tab-separated-values, 31 data points
