Mössbauer effect and x-ray analysis of rare earth stannates

Loebenstein, H. M.; Zilber, R.; Zmora, H.

doi:10.1016/0375-9601(70)90604-3

Cited by 15 publications

(5 citation statements)

References 3 publications

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“…Examination of the data suggests that the Ho compound is the anomalous result although it is unclear why this should be. The regular variation in x is in accord with the previously published Sn Mossbauer data which show (7,8) that the quadrupole splitting E varies systematically with the cubic lattice parameter. The quadrupole splitting depends on the electric field gradient and is a measure of the departure of SnO from a regular octahedron.…”

Section: Structuresupporting

confidence: 90%

“…The variation in electron density at the Sn nuclei arising from the structural changes should be reflected in the isomer shifts obtained in the Sn Mossbauer studies. Indeed in such studies it is found (7,8) that the isomer shift is effectively constant over the series of pyrochlore stannates; previously this has been ascribed to the near constant Sn-O bond length seen for the series of pyrochlore stannates. However, the present work has demonstrated that there is a systematic variation in the Sn-O bond distance.…”

Section: Structurementioning

confidence: 93%

“…For the SnO polyhedron, being a trigonal antiprism stretched along the 3 axis, the value of E is appreciable. As x is reduced this trigonal antiprism approaches a regular octahedron (it would become one at x"0.3125) and E is also reduced (7,8).…”

Section: Structurementioning

confidence: 98%

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Structural and Bonding Trends in Tin Pyrochlore Oxides

Kennedy

Hunter

Howard

1997

Journal of Solid State Chemistry

231

145

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Section: Structuresupporting

confidence: 90%

Section: Structurementioning

confidence: 93%

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Structural and Bonding Trends in Tin Pyrochlore Oxides

Kennedy

Hunter

Howard

1997

Journal of Solid State Chemistry

231

145

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“…However, in SnPZ07 the 6 distribution must be completely negligible; in the cubic pyrochlores Ln,Sn,07 (Ln = La to Lu) the progressive distortion of the SnOe octahedron of symmetry 3m increases A from -0.42 to -0.80 rnrn/s, yet 6 remains constant (50,51). This insensitivity of A to variations in SnO, geometry present in SnP20,(I) is further manifested on comparing the spectra of SnP207(I) and SnP207(II): although only a small number of distinct types of SnO, octahedra is expected to be present in I1 (six if 11 is isostructural with SiP207(II)) compared with the quasi-continuous distribution in I, the spectra are indistinguishable.…”

Section: Infrared and Raman Spectramentioning

confidence: 99%

Pyrophosphates of Tetravalent Elements and a Mössbauer Study of SnP₂O₇

Huang¹,

Knop²,

Othen³

et al. 1975

Can. J. Chem.

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Cubic M4+P2O7 pyrophosphates of Ti, Zr, Hf, Sn, and Pb have been examined by X-ray powder diffractometry and by infrared, Raman, and Mössbauer 119Sn spectroscopy. The tin compound appeared to be of Chaunac's type I (with P2O7 groups oriented at random) and could be converted to type II (with ordered P2O7 groups) by heating to high temperatures. All the other preparations were of Chaunac's type II. Evidence from lattice parameters and intensity features of the Raman spectra suggests that the cubic MP2O7 pyrophosphates fall in two groups, one containing the compounds of the typical elements (Ge, Sn, Pb) and the other, the compounds of the transition elements. No support has been found for the view that the P—O—P groupings of the pyrophosphate anion in these compounds are linear. The 119Sn chemical shift in SnP2O7 is only slightly less negative than the shift in CuSnF6.4H2O, which makes SnP2O7 one of the most ionic compounds of tetravalent tin known. The observed quadrupole splitting in the Mössbauer spectrum of SnP2O7 arises largely from the contribution of the valence term to the electric field gradient at the Sn atom.

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“…La valeur AEQ = 0,64 ± 0,02 mm. s -1 mesurée pour Sn02 est de l'ordre de grandeur de celles observées habituellement pour les composés inorganiques de l'étain tétravalent [6,10]. Il n'en est plus de même pour SnF4 qui présente une valeur très importante TABLEAU 1…”

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