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The side rarefaction method was used to measure the sound velocities in pressed samples of 90/10 iron/diamond, 85/15 iron/diamond, and 90/10 iron/sulfur mixtures and in samples of pressed iron (without additives) and St.3 steel. The measurement data were compared to geophysical data with a view to find a light chemical element (or elements) in the Earth's core composition that would reduce the total...
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