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Iron-containing phases in fly ashes from different combustion systems

100%

Szumiata T., Gzik-Szumiata M., Brzózka K., Górka B., Gawroński M., Świetlik R., Trojanowska M.

Nukleonika

2015

vol. 60

issue 1

151-154

The investigations of iron-containing phases existing in fly ashes were performed using transmission Mössbauer spectrometry. The examined samples of fly ashes were collected from different coal combustion systems, that is, stoker-fired boiler in municipal heating plant and pulverized coal boiler in power plant. Several phases are identified in the samples: iron oxides, paramagnetic aluminosilicate glass with Fe3+ ions and Al2O4-type spinel with Fe2+ ions. It was pointed out that proportions of contents of phases strongly depend not only on the combustion temperature but also on the way of ash collection.

The influence of thermal annealing on structure and oxidation of iron nanowires

84%

Krajewski M., Brzózka K., Górka B., Lin W.-S., Lin H.-M., Szumiata T., Gawroński M., Wasik D.

Nukleonika

2015

vol. 60

issue 1

87-91

Raman spectroscopy as well as Mössbauer spectroscopy were applied in order to study the phase composition of iron nanowires and its changes, caused by annealing in a neutral atmosphere at several temperatures ranging from 200°C to 800°C. As-prepared nanowires were manufactured via a simple chemical reduction in an external magnetic field. Both experimental techniques proved formation of the surface layer covered by crystalline iron oxides, with phase composition dependent on the annealing temperature (Ta). At higher Ta, hematite was the dominant phase in the nanowires.

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2 Nukleonika

2 2015

2 Brzózka K.

2 Gawroński M.

2 Górka B.

2 Szumiata T.

1 Gzik-Szumiata M.

1 Krajewski M.

1 Lin H.-M.

1 Lin W.-S.

1 Trojanowska M.

1 Wasik D.

1 Świetlik R.

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Iron-containing phases in fly ashes from different combustion systems

The influence of thermal annealing on structure and oxidation of iron nanowires