Lattice sternheimer factor of Eu(OH)3 from Mössbauer spectral study

The Mössbauer spectra of powdered Eu(OH)₃ were recorded between 300 and 4.2 K, with ¹⁵¹SmF₃ as source. The spectra showed one single absorption line having definite width but without any fine structure. The lattice Sternheimer factor γ_∞ of ¹⁵¹Eu in Eu(OH)₃ was estimated with the help of these spectra as well as by using the values of some physical parameters obtained from spectral and magnetic susceptibility measurements on pure single crystal of Eu(OH)₃, The value of lattice Sternheimer factor (= -87) thus evaluated is slightly larger than that value ( = - 80) for ¹⁵⁴Eu in ethylsulphate host. This result is consistent with the γ_∞ values of other rare-earth ions and also with the results obtained from magnetic and optical experiments on Eu(OH)₃.