352
P.-E. Lippens
Fig. 7.14 119 Sn Mössbauer spectra of Li x Sn crystalline references measured at room temperature.
Reprinted from Ref. [98]. Copyright 2007, with permission from Elsevier
α (Eq. 7.4). The experimental and theoretical averaged values of the isomer shift,
δ av , are in good agreement and the theoretical values of δ av (x) linearly increase with
N 5s (Fig. 7.16a) and decrease with N 5p (Fig. 7.16b) in line with Eq. (7.5).
The variations of N 5p (~0.25) are larger than those of N 5s (~0.1) and they both
linearly contribute to the variations of δ av . The increase of N 5p with x reflects the
increase of the electron transfer from Li to Sn due to the increase number of Li atoms
around each Sn.
Empirical correlation rules were previously proposed for Mössbauer parameters,
such as the -δ correlation diagram used to predict the electrochemical activity of tin
based electrode materials for Li-ion batteries [99]. In the present case, an empirical
P.-E. Lippens
Fig. 7.14 119 Sn Mössbauer spectra of Li x Sn crystalline references measured at room temperature.
Reprinted from Ref. [98]. Copyright 2007, with permission from Elsevier
α (Eq. 7.4). The experimental and theoretical averaged values of the isomer shift,
δ av , are in good agreement and the theoretical values of δ av (x) linearly increase with
N 5s (Fig. 7.16a) and decrease with N 5p (Fig. 7.16b) in line with Eq. (7.5).
The variations of N 5p (~0.25) are larger than those of N 5s (~0.1) and they both
linearly contribute to the variations of δ av . The increase of N 5p with x reflects the
increase of the electron transfer from Li to Sn due to the increase number of Li atoms
around each Sn.
Empirical correlation rules were previously proposed for Mössbauer parameters,
such as the -δ correlation diagram used to predict the electrochemical activity of tin
based electrode materials for Li-ion batteries [99]. In the present case, an empirical