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1

Meteoryty marsjańskie – czy rzeczywiście pochodzą z Marsa?

100%

Brzózka K., Woźniak M., Gałązka-Friedman J.

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vol. 15

27-46

EN

Although the concept of Martian meteorites was not yet known 50 years ago, today there are nearly 400 meteorites in this group. Only five of them were observed falling to Earth, the rest were found many years after their fall. They are all achondrites and, with a few exceptions, they all belong to the SNC (Shergotty-Nakhla-Chassigny) clan. At the end of the last century, the origin of these meteorites was hotly discussed and is intensively studied to this day. There is more and more evidence that their parent body is Mars. The main factor is the age of crystallization of SNC meteorites, repeatedly determined using various methods, mainly isotopic ones. This age does not exceed 2.4 billion years which is much less than the age of the Solar System, i.e. 4.6 billion years. Specific mineral and isotopic composition and proportion of gases trapped in the form of bubbles in the meteorite shock glass, identical in terms of noble gas content to the Martian atmosphere, also clearly points to Mars as the parent body of Martian meteorites. A significant contribution to the study of Martian meteorites is made by investigations carried out using Mössbauer spectroscopy based on iron, to determine the mineral composition of Martian meteorites and to compare the results with those obtained by spectrometers installed on Mars rovers during the MER – Mars Exploration Mission.

2

Iron-containing phases in fly ashes from different combustion systems

76%

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

Nukleonika

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2015

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vol. 60

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issue 1

151-154

EN

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.

3

Odróżnianie próbek prawdziwych meteorytów od kamiennych próbek meteorytopodobnych – ważna rola spektroskopii mössbauerowskiej

76%

Bogusz P., Gałązka-Friedman J., Brzózka K., Jakubowska M., Woźniak M., Karwowski Ł., Duda P.

Acta Societatis Metheoriticae Polonorum

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2022

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vol. 13

27-36

EN

Four stony pieces were delivered to our laboratory for checking if they are fragments of meteorites: first sample (sample No. 1) was a fragment of a rock that fell near Leoncin in Poland, second sample (sample No. 2) was a fragment of a rock found also in Poland in the vicinity of Pultusk, third sample (sample No. 3) was a meteorite specimen bought on the meteorite exchange and fourth sample (sample No. 4) was a stone object whose decline was observed in Europe. We obtained mössbauer spectra of the delivered samples. The mössbauer spectrum of sample No. 1 is very similar to the spectrum of ordinary chondrite of type LL. Comparison of the mössbauer spectrum of sample No. 2 with mössbauer spectrum of Pułtusk meteorite showed very large differences. In the spectrum of sample No. 3, a clear signal from iron-nickel alloy and troilite can be observed. These observations indicate that it is an object of extraterrestrial origin. Mössbauer spectrum of Sample No. 4 is similar to the spectrum of terrestrial magmatic rocks. Based on these spectrum we cannot clearly determine where the examined object comes from. This work demonstrates the usefulness of Mössbauer spectroscopy in recognizing samples that are fragments of meteorites.

4

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

64%

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

Nukleonika

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2015

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vol. 60

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issue 1

87-91

EN

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 Gałązka-Friedman J.

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Meteoryty marsjańskie – czy rzeczywiście pochodzą z Marsa?

Iron-containing phases in fly ashes from different combustion systems

Odróżnianie próbek prawdziwych meteorytów od kamiennych próbek meteorytopodobnych – ważna rola spektroskopii mössbauerowskiej

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