250
C. McCammon
Table 5.5 Mössbauer studies on samples quenched from extreme conditions
Topic
Property measured
Observable
Method
References
Calibration
XANES/flank
method
Oxidation state
Hyperfine
parameters, Fe 3+
area
RPS
[33, 34, 257, 258]
Carbon
chemistry
Oxidation state, site
geometry
Hyperfine
parameters
RPS
[248]
Charge transfer Magnetism
Hyperfine
parameters
RPS
[247]
Chemical
reaction
Defect structure
Fe 3+ area
RPS
[246]
Crystal
chemistry
Cation distribution
Hyperfine
parameters, Fe 3+
area
RPS
[242–245]
Elastic
properties
Cation distribution,
defect structure
Hyperfine
parameters, Fe 3+
area
RPS
[220–227]
Hydration
Defect structure,
oxidation state
Fe 3+ area
RPS
[195–210]
Isotopic
fractionation
Oxidation state
Hyperfine
parameters
NFS
[249–251]
Mantle
chemistry
Cation distribution,
defect structure,
oxidation state, spin
state
Hyperfine
parameters, Fe 3+
area
RPS
[35, 232–241]
Mantle
conductivity
Charge carrier
density, defect
structure
Fe 3+ area
RPS, SMS
[211–219]
Phase stability Oxidation state,
phase identification
Hyperfine
parameters, Fe 3+
area
RPS
[252–254]
Seismic
anomalies
Oxidation state
Fe 3+ area
RPS
[228]
Spin transition Cation distribution,
defect structure
Hyperfine
parameters, Fe 3+
area
RPS
[229–231]
concentration and hence charge mobility, which provides important insight into transport properties of Earth’s interior [211–219]. Elastic properties of minerals are influenced by their cation distribution and defect structure; hence Mössbauer measurements also play an important role in sample characterisation [220–227] and can
be used to construct velocity models for comparison with geophysical data [228].
Although spin transitions cannot be directly probed in quenched samples, characterisation of cation distribution and iron oxidation state of minerals studied in situ at