Isomeric chemical shifts of Mössbauer γ-lines in isoelectronic compounds of tin, antimony and tellurium

Abstract

Isomeric cheniical shift (IS) of the Mossbauer y-line of Sn1I9 (23.8 keV), SbI2' (37-2 keV), Te12S (35-6 keV) have been studied in the isoelectronic complexes, SnHa1g2, SbHalG' and TeHalZ2 (Hal = F, Cl, Br, I). Some other compounds of antimony have been also measured. The IS-values for these compounds depend linearly on the electro-negativity differences of the Mossbauer atom and ligand. The relation between relative change of the mean-square charge nuclear radius for three y-transitions, (&R/R)sb/(&R/R)s, = -(5.5 f0. 3) and ( & R / R ) T ~/ ( ~R / R ) s ~= + (1-1 f0.2), is obtained by comparing these dependences. In 37.2 keV and 35.6 keV y-transitions, the calibration of the IS value associated with one 5s-electron was also carried out. We have obtained the recoilless fraction of the 37-2 keV y-quanta from Sn12102 source as equal to f = 0*3228:8$. From the measurements of the dependence of resonance effect on the Sb205 absorber thickness the value of the total internal conversion coefficient for the 37-2 keV y-transition is -10.

Probes of Structural and Electronic Environments of Phosphor Activators: Mössbauer and Raman Spectroscopy

“…The chemical isomer shifts (δ values) are quite large in 121 Sb; from the extremes of Sb(III) to Sb(V) there is a range of ∼21 mm s -1 . Typical Sb(III) and Sb(V) δ values are given in Table . − …”

“…124 Typical Sb(III) and Sb(V) δ values are given in Table 7. [125][126][127][128] It is obvious that Sb(III) δ values are in the range from -16.5 to ∼ -10.0 mm s -1 , whereas those for Sb(V) are in the range from ∼4.2 to -3.5 mm s -1 . Therefore, for phosphors that are dependent on Sb(III) activators, any Sb(V) impurities will be easily seen by 121 Sb Mo ¨ssbauer spectroscopy, and therefore this technique should be attractive to phosphor chemists.…”

The 125Te Mössbauer Absorption Spectra of the Thiourea, Ethylenethiourea, and Tetramethylthiourea Derivatives of Tellurium(II) and Tellurium(IV)

“…The similarity in the quadrupole splittings for compounds [1][2][3][4][5][6][7][8][9][10][11][12] indicates that a similar imbalance in the 5p orbital populations exists in all cases. Within the context of the bonding scheme discussed above.…”

Change in Nuclear Radius upon Excitation forSn119,Sb

“…Some of the data of Shpinel et a/. 6 have also been included. Their values, however, are systematically somewhat less than those obtained by us.…”

“…6) using a value for p=1.9 X 10~4, which we obtained earlier from the ratio analysis. Assuming the tellurium ion in ZnTe to have a 5s 2 5p 6 configuration, the calibration has been obtained. This implies a shift of 0.3 mm/sec per Sp hole and -1.8 mm/sec per Ss hole.…”