Mössbauer study of SnO Lattice Dynamics

M.S. MORENO; R.C. MERCADER

PHYSICAL REVIEW B

AMER PHYSICAL SOC

Año: 1994 vol. 50 p. 9875 - 9881

1098-0121

Lattice dynamics of tin monoxide was investigated by Mossbauer spectroscopy in the range 16-294 K. From the temperature dependence of the absolute recoil-free fraction, f(T), the second moment of the phonon spectrum and the anharmonic constant e(-2) were determined. These results suggest that the dominant anharmonic contribution arises from the cubic term of the vibrational phonon-phonon coupling Hamiltonian. The absolute recoilless fraction was determined at room temperature by the linewidth method and found to be f(295 K)=0.12. No phase transitions were observed in this temperature range. The Mossbauer-line intensity-ratio-data temperature dependence displays a likely vibrational anisotropy.