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Mössbauer spectroscopic studies of thermal decomposition of substituted pentacyanoferrate(II) complexes

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Abstract

The thermal behaviour of substituted pentacyanoferrates(II) of the type Na3[Fe(CN5)L]·xH2O, whereL=n-, sec-, tert- oriso-butylamine,di-iso-butylamine ortri-n-butylamine, was investigated with the aid of Mössbauer spectroscopy, XRD and TG-DTG-DTA. The Mössbauer spectra of these complexes exhibit a quadrupole doublet with ΔE Q=0.70−0.83 mm s−1 at room temperature. The isomer shift, δ=0.00±0.03 mm s−1 suggests that the iron atom is in the +2 low-spin state. The complexes start to decompose at 50°C, yielding a residual mass of 5.8 –21.3% in the temperature range 900–950°C. The Mössbauer spectra recorded after heating at 150 and 300°C exhibit an asymmetric doublet, suggesting partial decomposition. The Mössbauer spectra at higher temperature are complex. At different stages of the thermal process, the presence of α-Fe2O3, γ-Fe2O3, α-Fe, Fe3C and Fe3O4 was demonstrated.

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Authors and Affiliations

  1. Radioisotope Research Centre, Tokyo Metropolitan University, Minami-ohsawa, Hachioji, 192-03, Tokyo, Japan

    R. B. Lanjewar, S. Kawata, S. Kitagawa & M. Katada

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  1. R. B. Lanjewar
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  2. S. Kawata
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  3. S. Kitagawa
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  4. M. Katada
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On leave from A. N. College, Anandwan-442 914, India

We are grateful to the Monbusho (Ministry of Education, Science, Sports and Culture) for the award of a fellowship to RBL and for financial assistance for the research work. Thanks are also due to Dr. T. Nakamoto for valuable cooperation.

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Lanjewar, R.B., Kawata, S., Kitagawa, S. et al. Mössbauer spectroscopic studies of thermal decomposition of substituted pentacyanoferrate(II) complexes. Journal of Thermal Analysis 50, 375–391 (1997). https://doi.org/10.1007/BF01980498

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  • DOI: https://doi.org/10.1007/BF01980498

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