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Identification of iron-bearing minerals in basalts and pillow lavas of the Kaczawa Mountains using 57Fe Mössbauer spectroscopy

Malczewski D., Jeleń M., Żaba J., Błachowski A., Ruebenbauer K., Dziurowicz M.

Nukleonika

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2017

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Vol. 62, No. 2

145--148

EN

The Kaczawa Mountains along with the Kaczawa foothill comprise a complicated geological unit that is called the Kaczawa metamorphic (Sudetes, SW Poland). The aim of our work was to identify the iron-bearing minerals in samples of basalts and pillow lavas from the Kaczawa metamorphic using 57Fe Mössbauer spectroscopy. Based on the preliminary results, the Fe3+/Fe2+ ratio in the samples was determined.

2

Crystal structure and Mössbauer study of FeAl2O4

Jastrzębska I., Szczerba J., Stoch P., Błachowski A., Ruebenbauer K., Prorok R., Śnieżek E.

Nukleonika

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2015

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Vol. 60, No. 1

47--49

EN

In this work the synthesis of hercynite from Fe2O3 and Al2O3 powders was carried out by arc-melting method under the protective argon atmosphere. The obtained material was characterized with the use of powder X-ray diffractometry (XRD) and Mössbauer spectroscopy (MS). A Mössbauer effect in hercynite obtained by the arc-melting method indicated the cations distribution in the spinel structure among the tetrahedral and octahedral interstices. The presence of Fe2+ ions was detected in both tetrahedral and octahedral sites while Fe3+ ions occupied only the octahedral interstices. The approximate formula of the obtained iron-aluminate spinel was as follows (Fe2+ 0.77Al3+0.23)(Fe3+0.07Fe2+0.05Al0.88)2O4.

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The Mössbauer spectrometer MsAa-4

Górnicki R., Ruebenbauer K.

Nukleonika

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2013

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Vol. 58, No. 1

17-21

EN

A description of the Mossbauer spectrometer MsAa-4 is given. The spectrometer has a modular design and it could be used as the gamma-ray spectrometer as well. It has almost entirely digital design to assure stability and repeatability. It is powered via the rechargeable battery to make it immune to the power failures. All settings are performed remotely over the Ethernet link used also to transfer data and spectrometer functions. External CAN bus could be used to attach auxiliary equipment. The status of the external equipment could be used to control spectrometer functions. Internal digital oscilloscope monitors vital functions of the spectrometer over the Ethernet link. Driving software operates under Microsoft Windows registered trademark systems and it is fully compatible with the Mosgraf-2009 data processing suite.

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Mosgraf - 2009 : the Mössbauer data processing suite of applications

Duraj Ł., Ruebenbauer K.

Nukleonika

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2013

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Vol. 58, No. 1

13-16

EN

This contribution gives general description of the Mössbauer data processing suite of applications Mosgraf- 2009. The suite is designed to process data obtained in the energy domain. It contains many applications to generate off-line functionality files of the spectrometers and many applications to pre-process data or to plot results of the calculations. The suite is designed for the Microsoft Windows registery mark systems and it is compatible with the MsAa-x spectrometers of the RENON family. It could be installed on the same computer as the spectrometer drivers provided a broadband Ethernet link is available for the computer in question. Applications are provided to accept data from other spectrometers as well. The suite contains a large collection of the applications to simulate or fit experimental data.

5

Mössbauer spectrometer MsAa-3

Błachowski A., Ruebenbauer K.

Nukleonika

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2007

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Vol. 52, supl. 1

7-12

EN

The paper is aimed at the description of the newly developed Mössbauer spectrometer MsAa-3. The spectrometer MsAa-3 consists of a high quality gamma-ray spectrometer including either a proportional gas detector head or a scintillation detector head, a transducer driving system including the transducer, data storage system, and data communication system based on the TCP/IP protocol. Additionally, the Michelson-Morley interferometer is provided for precise calibration of the transducer velocity. The spectrometer is equipped with an integrated simple temperature controller. All the essential functions are remotely controlled over the TCP/IP link allowing for the spectrometer set-up as the stand-alone unit in the computer network, e.g. on the Internet. External gamma-ray detectors or external complete nuclear blocks could be used as well. The spectrometer is equipped with software allowing for setting all the functions, to perform on-line control, and retrieve data. The Mössbauer data processing software MOSGRAF is enclosed as well. The latter software allows for the calculation of the variety of velocity reference functions.

6

Charge and spin density perturbation on iron atom due to osmium impurity in metallic iron

Błachowski A., Ruebenbauer K., Żukrowski J.

Nukleonika

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2004

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Vol. 49,suppl.3

67-70

EN

Samples of natural alfa-Fe doped randomly with Os impurities up to about 9 at.% have been investigated by means of the 14.41 keV Mössbauer absorption spectroscopy of 57Fe vs. Os concentration and at room temperature. It has been found that the nearest neighbor single Os impurity reduces hyperfine magnetic field on the iron nucleus by 3.97 T, while the second neighbor single Os impurity decreases this field by 1.11 T. More distant impurities slightly increase iron hyperfine field. There are no discernible effects of the Os-Os interaction on the magnetic field seen by iron. On the other hand, the electron charge density on the iron nucleus is increased by the nearest neighbor Os atom as seen via changes in the isomer shift, i.e. via changes in the spectral shift. The second neighbor impurity has the opposite effect on the charge density. More distant impurities tend to decrease the charge density as well. The effect of the first and second neighbor impurities decreases with increasing overall Os concentration indicating some Os-Os interaction influencing a charge density of the conduction electrons seen on the iron nucleus.

7

Zastosowanie spektroskopii mossbauerowskiej w badaniach przejść fazowych stali

Błachowski A., Ruebenbauer K., Jura J.

Hutnik, Wiadomości Hutnicze

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2004

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Vol. 71, nr 7-8

316-320

PL

W pracy zastosowano transmisyjną spektroskopię mossbauerowską (SM) linii 14, 41 keV w 57Fe do badania przejść fazowych w stali dupleks UR45N. Zarówno źródło Co(Rh) jak i badane próbki stali pozostały w temperaturze pokojowej. Metoda SM pozwala na łatwe rozróżnienie pomiędzy fazą ferrytyczną L (martenzytyczną), a paramagnetyczną fazą austenityczną y. Badania przeprowadzono na próbkach poddanych walcowaniu o różnym stopniu zgniotu. Skład fazowy nie uległ istotnym zmianom w wyniku walcowania nawet przy dużych zgniotach. Natomiast rozdrobnienie materiału w wyniku piłowania powoduje przemianę znacznej części fazy austenitycznej do fazy ferrytycznej. Wygrzanie próbek w temperaturze 713 stopni C przez 168 godzin transformuje całkowicie próbkę do fazy sigma niezależnie od zgniotu.

EN

A transmission Mossbauer spetroscopy (MS) of 14.41 keV line in 57 Fe was applied to look upon phase transitions in UR45N duplex steel. The 57 Co(Rh) source and samples investigated were maintained in the vicinity of the room temperature. The MS method allows clearly distinguish between ferritic L (martensitic) phase and the austenic y phase. Samples of vastly different rolling reductions have been investigated. It was found that the phase composition (L, y fractions) practically does not depend upon the rolling reduction even for large reductions. On the other hand, a significant amount of austenite transforms to the ferrite upon sample powdering. The annealing of the samples at 713 degree Celsius for 168 hours leads to a complete transformation of the sample into the sigma phase regardless of the rolling reduction.

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Mössbauer study of deformation induced martensitic phase transformation in duplex steel

Błachowski A., Ruebenbauer K., Jura J., Bonarski J., Baudin T., Penelle R.

Nukleonika

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2003

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Vol. 48,suppl.1

9-12

EN

Samples of cold rolled UR45N austenitic-ferritic duplex steel with cold rolling reduction ranging from 0% to 80% were investigated in the form of foils and powders by means of Mössbauer transmission spectroscopy. It was found that cold rolling has a minor effect on the martensitic transformation even at high reductions in the material under investigation. On the other hand, powdering process induces strong martensitic phase transformation, i.e., about 25% of austenite transforms into martensite during powdering. High rolling reductions as well as powdering reduce an average hyperfine magnetic field at iron by about 1 T, while annealing at about 430°C increases this field by about 3 T.