Chemistry Reference
In-Depth Information
Table 3.1
Mössbauer fractions f at RT and 80 K for some minerals (after Ref. [
3
])
Mineral
Val.
Coord.
f
RT
f
80
Oxides and hydroxides
Natural
a
Synthetic
b
Hematite
a-Fe
2
O
3
3+
O
6
0.837-0.851
0.923-0.928
3+
O
6
0.811-0.860
0.914-0.960
Magnetite
Fe
3
O
4
3+
O
4
0.889
0.941
2.5+
O
6
*0.80
-
Maghemite
c-Fe
2
O
3
3+
(O
4
,O
6
)
av
0.814
0.915
Goethite
c
a-FeOOH
3+
(O,OH)
6
0.804
0.912
Akaganeite
b-FeOOH
3+
O
2
(OH)
4
0.877
0.937
O
3
(OH)
3
0.835
0.922
Lepidocrocite
c-FeOOH
3+
(O,OH)
6
0.793
0.908
Ilmenite
FeTiO
3
2+
O
6
0.650
0.856
Spinel
Mg
0.9
Fe
0.1
AlO
4
2+
O
4
0.697
0.875
Silicates
Ferridiopside
Ca
1.03
Mg
0.77
Fe
0.20
Si
1.96
O
6
3+
O
6
(M1)
0.899
0.945
3+
O
4
(Te)
0.862
0.932
2+
O
6
(M1)
0.747
0.893
Diopside
Ca
0.89
Mg
0.81
Fe
0.04
Si
2.12
O
6
3+
O
6
(M1)
0.862
0.932
2+
O
6
(M1)
0.708
0.879
Hedenbergite
Ca
1.00
Mg
0.15
Mn
0.3
Fe
0.76
Al
0.03
Si
2.00
O
6
2+
O
6
(M1)
0.700
0.876
(continued)
