[SMP36-11] Density measurements of Fe up to 25 GPa based on X-ray absorption
Keywords:Diamond anvil cell, X-ray absorption method, Earth core
High pressures measurements were performed using DAC with gaskets having 3 sample chambers. Fe or amorphous samples were loaded in a sample chamber for density measurements. Powders of KCl, KBr, or RbBr as references for thickness were also loaded in another sample chambers. After XRD patterns were taken from all samples and references, absorption profiles were also measured. Experimental pressures were determined using pressure averages between KCl, KBr, or RbBr. Densities based on the X-ray absorption method were obtained using the Lambert Beer law with mass absorption coefficients from NIST data base. Densities of crystalline Fe were obtained up to 25 GPa and densities obtained based on X-ray absorption method were consistent with those by XRD.