https://doi.org/10.1007/s100510050027
The Mössbauer and magnetic resonances investigations of structural phase transitions in K2ZnCl4 crystals
National Institute for Materials Physics, 76900 Bucharest, Romania
Received:
3
February
1999
Revised:
4
May
1999
Published online: 15 January 2000
The experimental data carried out by Mössbauer and
magnetic resonances investigations of the structural phase transitions in
K2ZnCl4 crystals are discussed by a simple electrostatic model,
calculating, the lattice contributions to the local electric potential
V(r), electric field intensity E(r) and
electric field gradient tensor, 
(r)
and taking into account both the fractional electric point charges
and rigid lattice approximations. The validity of the model is proved by a
good fit of the computing results and experimental data of quadrupole
splitting parameters at K sites obtained by 39K-NMR methods in high
temperature incommensurate phase (∼ Pnam symmetry). The
experimental results obtained by Mössbauer and EPR methods in
commensurate phase (Pna21
symmetry) of iron and copper doped
K2ZnCl4 crystals are explained by relaxing the rigid lattice approximation.
The insertion of probe ions appear to be done on not-exactly-Zn2+ site.
PACS: 76.80.+y – Mössbauer effect; other γ-ray spectroscopy
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000
