Table 1 EXAFS fitting results for the coordination state of Y in selected mineral standards and aqueous solution.

From: Adsorption of rare earth elements in regolith-hosted clay deposits

Standard

Origin

Shell

Path

CN

R (Å)

σ2 (Å−2)

ΔE0 (eV)

S02

χ2

R-factor

Ref.

Y-aqueous

Synthetic, Inorganic Ventures

1st

Y-O

8.2 (4)

2.37 (1)

0.005

−1.7

1

656

0.016

1

Parisite-(Ce)

Muzo Mine, Bogota, Colombia

1st

Y-F

3

2.29 (2)

0.003 (2)

0

1

44

0.016

1

   

Y-O1

6

2.46 (1)

0.006 (3)

     
  

2nd

Y-O2

2

3.19 (4)

0.009 (7)

     

Y2O3

Synthetic, Johnsen Matthey

1st

Y-O

6

2.27 (1)

0.005 (1)

−6.4

1

2125

0.011

2

  

2nd

Y-Y1

6

3.53 (0)

0.003 (0)

     
   

Y-Y2

6

4.01 (1)

0.004 (1)

     

YPO4-Nd

Synthetic, ORNL

1st

Y-O1

4

2.33 (1)

0.004

2.4 (1.1)

1.2 (1)

995

0.047

3

   

Y-O2

4

2.40 (1)

0.004

     
  

2nd

Y-P

2

3.04 (1)

0.007

     
   

Y-Y

4

3.79 (1)

0.007

     
   

Y-O1-O2

16

3.87 (1)

0.009

     
   

Y-O3

4

4.19 (2)

0.007

     
   

Y-O4

8

4.26 (2)

0.007

     

Eudialyte

Kringlerne, Ilímaussaq, Greenland

1st

Y-O1a

2

2.24 (1)

0.004 (1)

1.2

1

33.4

0.017

4,5

   

Y-O1b

4

2.30 (1)

0.004 (1)

     
  

2nd

Y-Fe

1

3.29 (6)

0.007 (6)

     
   

Y-O2a

2

3.35 (1)

0.004 (1)

     
   

Y-Na

2

3.43 (3)

0.006 (4)

     
   

Y-Si

6

3.50 (3)

0.006 (4)

     
   

Y-O2b

2

3.53 (1)

0.004 (1)

     
   

Y-Ca

2

3.80 (5)

0.008 (6)

     
  1. EXAFS fits based on crystal structures from (1) Ni et al.71, (2) Santos et al.72, (3) Ni et al.73, (4) Johnsen74, (5) Borst et al.40. CN is coordination number. R is radial distance in ångström. Definitions of other fit parameters listed in this table are provided in the ‘Data Processing’ section of the methods. Errors shown within parentheses are on last digit of the fitted variable. Values without errors were fixed in the final fit.
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