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Mössbauer spectrometry

 

LEA distributes Mössbauer sources from RITVERC for more than 15 years. But what is Mössbauer spectrometry?


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Mössbauer spectrometry is a non-destructive nuclear resonance method for studying the valence states of atoms, their chemical bonds as well as their coordination within solid phases.

This technique can be used for about 40 isotopes (the most commonly studied being 57Fe, 119Sn, 119Sb, 170Dy and 197Au), in areas ranging from atomic physics to metallurgy and physics and solid-state chemistry, nanoscience, condensed matter physics, archeology, mineralogy (the Spirit and Opportunity rovers have bring a Mössbauer spectrometer for the study of Martian soil).

Mössbauer spectrometry can be applied to all kinds of solid materials (crystalline systems, amorphous, quasicrystalline, nanocrystalline, metallic alloys, insulators, conductors, polymers) and nano structures (nanostructure powders, nanoparticles).

It uses a radioactive source to excite the studied isotopes and to observe the perturbations of their nuclear energy levels by the measurement of 3 parameters: the isomeric shift, the quadrupole separation and the hyperfine field.*

* source : article 103 of GFSM

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The active part of Mössbauer source is prepared by electrodepositing high purity carrier-free 57Co onto a thin metal backing (matrix) followed by controlled annealing process. Standard matrix is rhodium or chromium. Other matrices are available on request. All sources are carefully tested on certified equipment. Each source is supported by a Test Report with measured values of spectra parameters.

Recommended working life: 10 years

 

Capsule Type 

D x H

[mm]

d

[mm]

Line Width

[mm/s]

ISO Classification 

Temperature range

[K]

Nominal Activity*

Code

mCi

MBq

Rhodium matrix

1

11.2 x 13

8

0.11 – 0.13

C54243

4.2 – 700

5

10

25

50

100

185

370

925

1850

3700

MCo7.111

MCo7.112

MCo7.113

MCo7.114

MCo7.115

2

14 x 14

8

0.11 – 0.13

C54243

4.2 – 700

5

10

25

50

100

185

370

925

1850

3700

MCo7.121

MCo7.122

MCo7.123

MCo7.124

MCo7.125

6

6 x 13

4

0.11 – 0.15

C54243

4.2 – 700

5

10

25

50

100

185

370

925

1850

3700

MCo7.161

MCo7.162

MCo7.163

MCo7.164

MCo7.165

9

4 x 14

1

0.13 – 0.15

C34243

220 – 450

5

10

185

370

MCo7.191

MCo7.192

10

6 x 17

1

0.13 – 0.15

C34243

220 – 450

5

10

185

370

MCo7.1101

MCo7.1102

Chromium matrix

1

11.2 x 13

8

0.13 – 0.16

C5443

4.2 – 700

5

10

25

50

185

370

925

1850

MCo7.511

MCo7.512

MCo.513

MCo.514

2

14 x 14

8

0.13 – 0.16

C54243

4.2 – 700

5

10

25

50

185

370

925

1850

MCo7.521

MCo7.522

MCo7.523

MCo7.524

 

 

 

 

 

 

 

 

 

 

* Tolerance: -5% to +10% | 14.41 keV photon emission efficiency ≥ 75% | Recoilless fraction : 0.75

1et6 1 & 6 9 9
2 2 10 10
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Mössbauer source active part is based on calcium stannate [CaSnO3] matrix synthesized from high specific activity (>300 mCi/g) 119mSn radionuclide. All sources are carefully tested on certified equipment. Each source is supported by a Test Report with measured values of spectra parameters.

Recommended working life: 10 years

Capsule Type

D x H

[mm]

d

[mm]

Line Width

[mm/s]

ISO Classification 

Temperature range

[K]

Nominal Activity*

Code

mCi

MBq

1

11.2 x 13

10

0.38 – 0.54

C54243

4.2 – 700

2

5

10

74

185

370

MSn9.211

MSn9.212

MSn9.213

2

14 x 14

10

0.38 – 0.54

C54243

4.2 – 700

2

5

10

15

74

185

370

555

MSn9.221

MSn9.222

MSn9.223

MSn9.224

3

18 x 14

15

0.38 – 0.54

C54243

4.2 – 700

10

15

20

370

555

740

MSn9.233

MSn9.234

MSn9.235

6

6 x 13

5

0.45 – 0.54

C54243

4.2 – 700

2

5

74

185

MSn9.261

MSn9.262

* Tolerance: -5% to +10% | 23.87 keV photon emission efficiency ≥ 75% | Recoilless fraction : 0.5

1et6 (bis) 1&6
2et3 2&3
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Mössbauer effect reference absorbers contain chemical substances synthesized with either enriched ⁵⁷Fe (>95%) or natural iron. The substances are uniformly dispersed in polyethylene dics of 1 mm thickness and 20 mm diameter, placed between two polyimide films in aluminium holders.

K4Fe(CN)6 × 3H2O and K2MgFe(CN)6 exhibit unsplit narrow line in Mössbauer absorption spectra. FeC2O4 × 2H2O exhibits quadrupole splitting, leading to two narrow lines in Mössbauer absorption spectrum. αFe and Fe2O3 exhibit magnetic hyperfine splitting, leading to six narrow lines in Mössbauer absorption spectra. All reference absorbers are carefully tested on certified equipment.

Each absorber is supported by a Test Report with measured values of Mössbauer spectra parameters.

 

schéma1
graph2
graph3
absorber

 

Description

Thickness

[mg 57Fe/cm²]

Code



Enriched iron reference absorbers

 

K2MgFe(CN)6

0.25 – 1

MRA.1.1.X*

 

FeC2O4 x 2H2O

0.5 – 1

MRA.1.2.X*

 

Fe2O3

1 – 2

MRA.1.3.X*

 

α-Fe foil

3 µm

MRA.1.6

 

Natural iron reference absorbers

 

FeC2O4 x 2H2O

0.13 – 0.25

MRA.2.2.X*

 

Fe2O3

0.13 – 0.25

MRA.2.3.X*

 

K4Fe(CN)6 x 3H2O

0.13 – 1

MRA.2.4.X*

 

α-Fe foil

30 µm

MRA.2.6

 

 

 

 

 

 

 

 

 

 

 

* « X » represents the thickness of the absorber in mg 57Fe/cm². Available values of X = { 1 ; 2 ; 3 ; 4 ; 5 }, respectively for { 0.13 ; 0.25 ; 0.5 ; 1 ; 2 } mg 57Fe/cm²

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