Table 1 XANES analysis for Mn-doped UO2 samples and Mn standards.

From: Fabrication, defect chemistry and microstructure of Mn-doped UO2

Sample/Standard

Valence state

Mn environment

E0 (white line) position (eV, ± 0.6)

Pre-edge centroid position

(eV, ± 0.6)

Pre-edge integrated area (± 0.03)

300 ppm Mn (Calcined)

  

6551

6540

0.049

600 ppm Mn (Calcined)

  

6551

6540

0.099

1200 ppm Mn (Calcined)

  

6551

6540

0.072

1200 ppm Mn (Sintered)

1.80a

Distorted cubicb

6551

6540

0.078

2400 ppm Mn (Calcined)

  

6551

6540

0.064

2400 ppm Mn (Sintered)

1.88a

Distorted cubicb

6551

6540

0.072

(Mn,Fe)(Ta,Nb)2O6

2

Oh

6552

6540

0.055

Mn2SiO4

2

Oh

6550

6540

0.155

MnSiO3

2

Ohc

6551

6540

0.186

MnO

2

Oh

6550

6540

0.286

MnFe2O4

2

Td

6556

6541

0.481

Mn3O4

2/3

Oh /Td

6557

6541

0.112

Mn2O3

3

Oh

6554

6541

0.231

MnO(OH)

3

Oh

6556

6541

0.148

CaMn2O4

3

Oh

6555

6541

0.010

MnO2

4

Oh

6558

6542

0.510

  1. (Oh) is octahedral and (Td) is tetrahedral local symmetry environment. aCalculated bond valence sum from EXAFS model (Table 2); bDetermined from EXAFS models (Table 2); c distorted16.
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