Mossbauer study of Sn-119 hyperfine interactions in the KTi1-xSnxOPO4 systemстатья
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Аннотация:The first Mossbauer study of hyperfine interactions of Sn-119 nuclei in the complex ferroelectric oxides KTi1-xSnxOPO4 is reported. A one-to-one correspondence between the hyperfine interaction parameters and tin atom arrangement in cis and trans positions of the structure has been established. The electric-field gradient at Sn-119 nuclei is shown to be dominated by the contribution of valence electrons in the hybridized p and d orbitals. A linear correlation between the quadrupole displacement of the spectrum components and the average Sn-O distances has been revealed. The Mossbauer line shift data were used to estimate the number of valence s electrons of Sn4+ ions occupying the cis and trans positions throughout the x range covered. (C) 1998 American Institute of Physics.