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A Temperature-Dependent 119Sn and 57Fe Mössbauer Study of Malayaite, CaSnSiO5:Fe

✍ Scribed by D. Niemeier; H. Mehner; U. Bismayer; K. D. Becker

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 281 KB
Volume: 211
Category: Article
ISSN: 0370-1972
DOI: 10.1002/(sici)1521-3951(199902)211:2<581::aid-pssb581>3.0.co;2-m

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✦ Synopsis

We report on a temperature-dependent Mo È ssbauer study of natural and synthetic malayaite, CaSnSiO 5 . 119 Sn spectra have been measured between liquid nitrogen temperatures and 1310 K. The 119 Sn Mo È ssbauer shift is found to show a significantly reduced temperature dependence if compared with predictions for the second-order Doppler contribution. In iron doped malayaite, the two dominating 57 Fe subspectra are attributed to ferric ions located on Sn and Ca sites. The temperature-dependent spectra of 119 Sn and 57 Fe are discussed in context with the structural anomaly at about 500 K reported by Groat et al. From comparison of quadrupole interactions of tin and iron, an estimate of the nuclear quadrupole moment of 119 Sn is derived as Q 0.13b which is in good agreement with recent studies.

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