Reference Absorbers

⁵⁷FeEnriched iron absorbersNatural iron absorbers

Description

Mössbauer effect reference absorbers contain chemical substances synthesized with either enriched ⁵⁷Fe (> 95 %) or natural iron. The substances are uniformly dispersed in polyethylene and shaped into discs: 20 mm in diameter, placed between two polyimide films with total thickness of 100 ± 10 μm in aluminium holders. Potassium and potassium-magnesium ferrocyanide [K4Fe(CN)6×3H2O; K2MgFe(CN)6] exhibit unsplit narrow line in Mössbauer absorption spectra. Ferrous oxalate dihydrate [FeC2O4×2H2O] exhibits quadrupole splitting, leading to two narrow lines in Mössbauer absorption spectrum. Metallic iron and iron oxide [αFe; Fe2O3] exhibit magnetic hyperfine splitting, leading to six narrow lines in Mössbauer absorption spectra.

Mössbauer reference absorber
Description
Thickness, mg ⁵⁷Fe/cm²
Code
Enriched iron reference absorbers
K2MgFe(CN)6
0.25–1.00
MRA.1.1.X
FeC2O4×2H2O
0.50–1.00
MRA.1.2.X
Fe2O3
1.00–2.00
MRA.1.3.X
α–Fe foil
3 μm
MRA.1.6
Natural iron reference absorbers
FeC2O4×2H2O
0.13–0.25
MRA.2.2.X
Fe2O3
0.13–0.25
MRA.2.3.X
K4Fe(CN)6×3H2O
0.13–0.25
MRA.2.4.X
α–Fe foil
30 μm
MRA.2.6

* “X” is the thickness of the reference absorber in mg (⁵⁷Fe/cm²): X = 1, 2, 3, 4 and 5 for 0.13, 0.25, 0.50, 1.00 and 2.00 respectively.