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Thermodynamic properties of dilute Co-Fe solid solutions studied by 57Fe Mössbauer spectroscopy

Konieczny R., Idczak R.

Nukleonika

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2017

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Vol. 62, No. 2

109--115

EN

The Co1–xFex alloys where x ranges from 0.01 to 0.06 were measured at room temperature using transmission Mössbauer spectroscopy (TMS). The analysis of the obtained data allowed the determination of the short-range order (SRO), the binding energy Eb between two iron atoms in the studied materials using the extended Hrynkiewicz-Królas idea and the enthalpy of solution HCo-Fe of Fe in Co. The results showed that the Fe atoms dissolved in a Co matrix interact repulsively and the estimated value of HCo-Fe = –0.166(33) eV/atom. Finally, values of the enthalpy of solution were used to predict the enthalpy of mixing for the Co-Fe system. These findings were compared with corresponding data given in the literature, which were derived from calorimetric experiments and from the cellular atomic model of alloys described by Miedema.

2

Interactions between osmium atoms dissolved in iron observed by the 57Fe Mössbauer spectroscopy

Konieczny R., Idczak R., Chojcan J.

Nukleonika

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2015

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Vol. 60, No. 1

75--79

EN

The room temperature 57Fe Mössbauer spectra for binary iron-based solid solutions Fe1−xOsx, with x in the range 0.01 ≤ x ≤ 0.05, were analyzed in terms of binding energy Eb between two Os atoms in the Fe-Os system. The extrapolated values of Eb for x = 0 were used for computation of enthalpy of solution of osmium in iron. The result was compared with that resulting from the cellular atomic model of alloys by Miedema. The comparison shows that our fi ndings are in qualitative agreement with the Miedema’s model predictions.

3

Thermodynamic properties of Au-Fe alloys studied with 57Fe Mössbauer spectroscopy

Idczak R., Konieczny R., Chojcan J.

Nukleonika

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2013

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Vol. 58, No. 1

93-97

EN

The room temperature Mossbauer spectra of 57Fe were measured for Au1.xFex alloys with x in the range 0.01 less-than or equal to x less-than or equal to 0.03. The obtained data were analysed in terms of short range order parameter (SRO) and the binding energy Eb between two iron atoms in the studied materials using the extended Hrynkiewicz-Krolas idea. The estimated negative SRO parameters and the positive binding energy suggest ordering tendencies in Au-Fe alloys at low iron concentration. The extrapolated value of Eb for x = 0 was used for the computation of enthalpy of the solution of Fe in Au. The results were compared with the corresponding data derived from calorimetric measurements, previous Mossbauer experiments and resulting from the cellular atomic model of alloys by Miedema.

4

Rozpuszczalność granatu itrowo – glinowego w topniku PbO/B2O3

Sarnecki J.

Materiały Elektroniczne

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2013

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T. 41, nr 1

33--46

PL

Praca dotyczy analizy rozpuszczalności kryształów Y3Al5O12 (YAG) w stopionej mieszaninie PbO-B2O3. Analizę przeprowadzono wykorzystując przedstawiony przez van Erk'a model, w którym założono, że rozpuszczona faza granatu tworzy z rozpuszczalnikiem PbO-B2O3 ciecz jonową. Określono zależności między iloczynem rozpuszczalności YAG bez domieszek oraz domieszkowanego jonami ziem rzadkich i galu a temperaturą nasycenia roztworu wysokotemperaturowego, z którego zachodziła epitaksja warstw YAG. Z wyznaczonych doświadczalnie zależności określono wartość entalpii rozpuszczania kryształów YAG.

EN

This work is devoted to the analysis of the solubility of Y3Al5O12 crystals in a molten mixture of PbO-B2O3. The analysis was performed using the model proposed by Van Erk, which assumed that the dissolved garnet phase formed an ionic fluid with PbO-B2O3. The relation between the solubility product of YAG substituted by rare earth or gallium ions and non-substituted YAG and the saturation temperature of a high-temperature solution suitable for the epitaxial growth of YAG layers was determined. The value of the solution enthalpy of the YAG phase was estimated from this empirical relation.