Isomer shift of the Mo¨ssbauer spectrum of151EuF3

Large, N.R.; Bullock, R.J.; Glentworth, P.; Newton, D.

doi:10.1016/0375-9601(69)90168-6

Cited by 13 publications

(4 citation statements)

References 4 publications

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“…Using these results obtained with absorbers of different Eu compounds, one can identify the charge states of the ß~ decay products in radioactive sources emitting the 21.6 keV y-rays by their isomer shifts. Minor discrepancies between isomer shift values reported by different authors [17,18] are too small to be essential in this context.…”

Section: The 216 Kev /-Transition In 151 Eumentioning

confidence: 89%

“…The isomer shifts of the 21.6 keV y-rays in divalent and trivalent europium compounds have been studied extensively [15][16][17][18][19][20][21], The typical shifts between Eu +a and EU+ 3 fall into the range of 10 to 14 mm/s and by far exceed the experimental full line width at half maximum of about 4 mm/s. Using these results obtained with absorbers of different Eu compounds, one can identify the charge states of the ß~ decay products in radioactive sources emitting the 21.6 keV y-rays by their isomer shifts.…”

Section: The 216 Kev /-Transition In 151 Eumentioning

confidence: 99%

“…The spectra obtained with the anhydrous chloride sources are reproduced in Fig. 2 hydrous chlorides exhibit a well defined additional line near +13 mm/s which can be attributed to Eu+ a on the basis of the isomer shift data [15][16][17][18][19][20][21] for divalent and trivalent Eu compounds. Gerth et al [17], e. g., found an isomer shift of (13.79 ± 0.08) mm/s between Eu 2 (C 2 0 4 ) 3 -10H 2 0 and EuCl 2 , with the higher transition energy in the trivalent compound.…”

Section: Measurementsmentioning

confidence: 99%

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Mössbauer Study of the Chemical Consequences of the ¹⁵¹Sm(β~)¹⁵¹Eu Decay in Various Samarium Compounds

et al. 1972

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Decay 19 isotope effect may originate from different decomposition probabilities of initially formed CH a 18 F and CD 3 18 F.The energy shadowing effect occurs when one reaction product is formed on the average at a higher energy than another. This depletes the number of hot atoms reaching lower energies, and thus the total probability of forming the lower energy product. In general, however, the shape of the collisional distribution function will be the same since the excitation function for most reactions is fairly broadly distributed over energy. The case under consideration should not be strongly affected by energy shadowing because both methane reactants are exposed to the same product yield spectrum of reactions from CF 4 at equal dilutions. Taking the ratio of CH 3 18 F/CD 3 18 F then eliminates whatever effect may have occurred. SummaryThe chemical consequences of the 151 Sm(j? _ ) 161 Eu decay were studied by means of the Mössbauer effect of the 21.6 keV y-rays of l5l Eu emitted from various 151 Sm compounds at 300 K, 77 K, and 4.2 K. In the emission spectra of sources of anhydrous SmCl 3 , (Sm -33 La , 7 )C1 3 , and (Sm 02 La 98 )Cl 3 the formation of both Eu +a and Eu +2 is observed, whereas Sm 2 0 3 , (Sm 02 Ce 98 )0 2 , Sm 2 (C 2 0 4 ) 3 · 10H 2 0, and (Sm. 02 La 98 )Cl 3 · 6H 2 0 were found to emit only the Eu +3 line within the limits of statistical error. These results are tentatively discussed in terms of a strong influence of the host-lattice structure on the chemical stability of Eu +2 formed after the 161 Sm ß~ decay by a fast electronic recombination mechanism. ZusammenfassungDie chemischen Folgen des 161 Sm(/?-) lsl Eu-Zerfalls in verschiedenen Verbindungen von 151 Sm wurden bei 300 K, 77 Κ und 4,2 Κ mit Hilfe des Mößbauer-Effekts der nach dem jS~-Zerfall emittierten 21,6 keV y-Strahlung von 161 Eu untersucht. In den Emissionsspektren von Quellen aus wasserfreiem SmClj, (Sm 33 La -97 )Cl 3 und (Sm 02 La ie )Cl 3 wurde sowohl die Bildung von Eu +S als auch von Eu+ 2 beobachtet. Quellen von Sm 2 0,, (Sm 02 Ce ee )O 2 , Sm 2 (C 2 0 4 ) 3 · 10H 2 0 und (Sm, 02 La » 8 )Cl 3 · 6H 2 0 dagegen emittieren innerhalb der statistischen Genauigkeit nur die für Eu +S charakteristische Linie. Es wird versucht, diese Resultate aufgrund eines starken Einflusses der Struktur des Gastgitters auf die chemische Stabilität des nach /? _ -Zerfall von lsl Sm durch schnelle Elektronenübertragung gebildete Eu+ 2 zu verstehen. RésuméUtilisant les rayons γ de 21,6 keV émis par 151 Eu, on a étudié les conséquences chimiques de la désintégration m Sm (/? -) 151 Eu à 300 K, 77 K et 4,2 K dans un nombre de composés de 161 Sm par la méthode Mössbauer. Dans les spectres d'émission de sources de SmCl a , (Sm 33 La" v )C) 3 , et (Sm 02 La 98 )Cl 3 la formation de Eu +3 aussi bien que de Eu +2 a été observé. Ci contre, pour Sm 2 0 3 , (Sm 02 Ce 98 )O 2> Sm 2 (C 2 0 4 ) 3 · 10H 2 0, et (Sm 02 La e8 )Cl 3 · 6H¡¡0 on a, entre les limits de l'erreur statistique, seulement trouvé une émission de la ligne Mössbauer de Eu +> . La disc...

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Section: The 216 Kev /-Transition In 151 Eumentioning

confidence: 89%

Section: The 216 Kev /-Transition In 151 Eumentioning

confidence: 99%

Section: Measurementsmentioning

confidence: 99%

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Mössbauer Study of the Chemical Consequences of the ¹⁵¹Sm(β~)¹⁵¹Eu Decay in Various Samarium Compounds

et al. 1972

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“…For cubic Eu

_{2}

_{3}

, shift values are close to 1.0 mm/s [36,117,132,133,134]. For Eu

^{3 +}

in lanthanide oxides and the related compounds Sc

_{2}

_{3}

, Y

_{2}

_{3}

, and In

_{2}

_{3}

the isomer shifts increase in the sequence Gd

_{2}

_{3}

, Y

_{2}

_{3}

, Sc

_{2}

_{3}

, Lu

_{2}

_{3}

, and In

_{2}

_{3}

, while the mean Ln-O distance decreases in the same sequence (Table 3) [66,119].…”

Section: Materials Overviewmentioning

confidence: 99%

Characterization of Luminescent Materials with 151Eu Mössbauer Spectroscopy

Steudel

Johnson

et al. 2018

Materials

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The application of Mössbauer spectroscopy to luminescent materials is described. Many solids doped with europium are luminescent, i.e., when irradiated with light they emit light of a longer wavelength. These materials therefore have practical applications in tuning the light output of devices like light emitting diodes. The optical properties are very different for the two possible valence states Eu2+ and Eu3+, the former producing ultraviolet/visible light that shifts from violet to red depending on the host and the latter red light, so it is important to have a knowledge of their behavior in a sample environment. Photoluminescence spectra cannot give a quantitative analysis of Eu2+ and Eu3+ ions. Mössbauer spectroscopy, however, is more powerful and gives a separate spectrum for each oxidation state enabling the relative amount present to be estimated. The oxidation state can be identified from its isomer shift which is between −12 and −15 mm/s for Eu2+ compared to around 0 mm/s for Eu3+. Furthermore, within each oxidation state, there are changes depending on the ligands attached to the europium: the shift is more positive for increased covalency of the bonding ligand X, or Eu concentration, and decreases for increasing Eu–X bond length.

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1969 Data Index

Stevens

1970

Mössbauer Effect Data Index

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Isomer shift of the Mo¨ssbauer spectrum of151EuF3

Cited by 13 publications

References 4 publications

Mössbauer Study of the Chemical Consequences of the ¹⁵¹Sm(β~)¹⁵¹Eu Decay in Various Samarium Compounds

Mössbauer Study of the Chemical Consequences of the ¹⁵¹Sm(β~)¹⁵¹Eu Decay in Various Samarium Compounds

Characterization of Luminescent Materials with 151Eu Mössbauer Spectroscopy

1969 Data Index

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Isomer shift of the Mo¨ssbauer spectrum of151EuF3

Cited by 13 publications

References 4 publications

Mössbauer Study of the Chemical Consequences of the 151Sm(β~)151Eu Decay in Various Samarium Compounds

Mössbauer Study of the Chemical Consequences of the 151Sm(β~)151Eu Decay in Various Samarium Compounds

Characterization of Luminescent Materials with 151Eu Mössbauer Spectroscopy

1969 Data Index

Contact Info

Product

Resources

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Mössbauer Study of the Chemical Consequences of the ¹⁵¹Sm(β~)¹⁵¹Eu Decay in Various Samarium Compounds

Mössbauer Study of the Chemical Consequences of the ¹⁵¹Sm(β~)¹⁵¹Eu Decay in Various Samarium Compounds