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. 2014 Feb 12;7(2):1155–1164. doi: 10.3390/ma7021155

Table 1.

The measured holmium concentration (determined by total reflection X-ray fluorescence (TXRF)) in the iron oxide nanoparticles is lower than the nominal concentration during synthesis.

Sample name Nominal molar percentage (%) TXRF molar percentage (%)
Fe3O4–1.25Ho 1.25 0.92
Fe3O4–2.5Ho 2.5 2.0
Fe3O4–5Ho 5 3.8
Fe3O4–10Ho 10 7.6