Hyperfine interactions and lattice dynamics of Sn21O6Cl16(OH)14

In this study, the tin(II) oxy-hydroxychloride Sn₂₁O₆Cl₁₆(OH)₁₄ has been synthesised and investigated. This compound is the synthetic equivalent of mineral abhurite, which was discovered in 1985 as a tin corrosion product formed on the surface of tin ingots after long immersion in seawater. The Mössbauer parameters of Sn₂₁O₆Cl₁₆(OH)₁₄ determined at various temperatures are reported and discussed for the first time. At room temperature, the isomer shift and the quadrupole splitting are, respectively, δ=3.22 mm s⁻¹ and Δ=1.71 mm s⁻¹, relative to the centroid of the spectrum of BaSnO₃. The Mössbauer recoil-free fraction has been also evaluated over a wide range of temperature. At 300 K, the recoil-free fraction of Sn₂₁O₆Cl₁₆(OH)₁₄ is f₃₀₀=0.09±0.02.