A Normos-90 computer program was used to determine the Mössbauer parameters. The solid line in the spectrum represents computer-fitted curves, and dots represent the experimental points. The velocity scale (±9 mm/s) is calibrated with metallic iron foil absorber, and isomer shift (IS) is given with respect to the center (at 0 mm/s) of this spectrum.
Fourier transform-infrared (FT-IR) spectra of
powdered samples were recorded using the Bruker IFS-
66 series. The infrared spectrum range was 4000–400
cm–1. Samples of 2 mg were thoroughly mixed with 200
mg of spectroscopic grade KBr in an agate mortar. The
mixtures were placed in a hydraulic press and compressed
to produce pellets for recording the spectra. The spectra
of samples were recorded by accumulating 34 scans at 2.0
cm–1 resolution.
Differential thermal and thermogravimetry analyses
(DT/TGA) of the samples were carried out with a
Setaram Setsys Evaluation simultaneous thermal analysis
apparatus. The samples were heated in an Al2
O3
crucible in
the temperature range of 30–1250 °C with a heating rate of
10 °C min–1 in a nitrogen atmosphere. About 25 mg of the
samples was used in each run