Lattice dynamics of tin monoxide was investigated by Mossbauer spectro
scopy in the range 16-294 K. From the temperature dependence of the ab
solute recoil-free fraction, f(T), the second moment of the phonon spe
ctrum and the anharmonic constant epsilon(-2) were determined. These r
esults suggest that the dominant anharmonic contribution arises from t
he cubic term of the vibrational phonon-phonon coupling Hamiltonian. T
he absolute recoilless fraction was determined at room temperature by
the linewidth method and found to be f(295 K) = 0.12(1). No phase tran
sitions were observed in this temperature range. The Mossbauer-line in
tensity-ratio-data temperature dependence displays a likely vibrationa
l anisotropy.