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Investigation of the Absorption of Annihilation Quanta in Solid and Liquid Ga and BiSn Alloy

100%
Kluza A., Rudzińska W., Szuszkiewicz M.
Acta Physica Polonica A
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2001
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vol. 99
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issue 3-4
407-413
EN
Absorption of positron annihilation quanta in Ga and Bi_{40}Sn_{60} alloy in the solid and the liquid phase was investigated. It was found that the mechanism of absorption of annihilation quanta changes on passing from the solid to the liquid state. Results of measurements for Ga and Bi_{40}Sn_{60} alloy show that for metals changing their density at the melting point the photopeak profiles are modified: their centers of gravity in liquid phase are displaced with respect to those in the solid phase and the number of counts under the photopeak changes, too.
2
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Pressure Dependence of the Raman Modes Related to the Phase Transitions in Cyclohexane

63%
Yurtseven H., Cebeci A.
Acta Physica Polonica A
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2015
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vol. 127
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issue 3
744-747
EN
The pressure dependence of the Raman frequencies for the ν_{21} mode is studied by using the volume data at room temperature close to the transitions among the phases of III, IV and V in cyclohexane. By determining the pressure dependence of the mode Grüneisen parameter γ_{T} in the phases and taking the average values, the Raman frequencies of those modes associated with the phase transitions are predicted through the volume data in cyclohexane. Our predicted Raman frequencies agree with those observed experimentally in this organic molecule. The Raman frequencies of the other modes can be calculated in cyclohexane and also in some molecular crystals using the method given here.
3
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Laser Microstructure Modification of Metallic Materials

63%
Major B., Ciach R., Ebner R., Jeglitsch F.
Acta Physica Polonica A
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1996
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vol. 89
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issue 2
171-182
EN
Structure changes in laser constituted surface layers of aluminium alloys of the systems: Al-Zn, Al-Fe, Al-Fe-Ni, Al-Si were examined. Significant structure refinements and even formation of characteristic precipitates for rapidly quenched microstructure were found. Fine martensitic microstructure was observed in constructional steels of the types: X45CrSi92 (H9S2) and C50 (50G) subject to a laser modification. The study of influence of the chemical composition on the solidification structure and hardness was carried out on a steel 45, as well as on a high speed steel M2 (SW7M), by laser alloying using carbides of the types: VC, Mo_{2}C and the borides of the types: CrB, VB_{2}, B_{4}C. Thermodynamic calculations of phase diagrams were made to predict the changes of the constitution due to laser alloying. A comparison of the solidification structures and the calculated phase diagrams revealed a good agreement, especially for carbides. Boride alloying led to very complex microstructures consisting of various metallic and intermetallic phases.
4
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Investigation of the Solid-Liquid Phase Transition for SnIn Alloys by the Positron Annihilation Method

51%
Chabik S., Rudzińska W., Szuszkiewicz M., Szymański C.
Acta Physica Polonica A
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1993
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vol. 83
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issue 3
261-265
EN
The monovacancy formation energy in Sn-17 wt.% In and Sn-32 wt.% In was determined on the basis of the temperature dependence of the peak counting rate for these alloys. A sudden increase in the counting rate was observed between solidus and liquidus temperature. This phenomenon is connected with the formation of large defects acting as positron traps.
5
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Investigation, of Solid-Liquid Phase Transition for Sn-54wt%In Alloy by Positron Anihilation Spectroscopy

51%
Chabik S., Szuszkiewicza M., Rudzińska W.
Acta Physica Polonica A
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1995
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vol. 88
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issue 1
97-101
EN
The peak coincidence counting rate F(T) was measured for Sn-54wt%In alloy at the temperature range from room temperature to 400°C. It was observed that for both heating and cooling run, F(Τ) parameter changes in the liquid phase. These changes were related to disintegration of SnII microcrystals. From a simple trapping model the defect disintegration enthalpy, H_{1}, was calculated. For heating and cooling run, the value of H_{1} was 0.53 ± 0.03 eV and 0.67 ± 0.07 eV, respectively. For well-annealed and cold rolled samples we find only one component, equal 200 ps, in the lifetime spectrum.
6
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Positron Annihilation in Solid and Liquid Bi_{40}Sn_{60} Alloy

51%
Chabik S., Rudzińska W., Szuszkiewicz M., Szymański C.
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vol. 95
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issue 4
479-482
EN
The peak counting rate, F(T), for Bi_{40}Sn_{60} alloy in the temperature range from room temperature to 400°C was measured in three consecutive heating-cooling runs. Significant changes in F(T) were observed in the temperature interval between the solidus and liquidus temperature. The magnitude of these anomalies systematically diminishes in consecutive heating-cooling runs. Noticeable changes of values of F(T) parameter in the liquid alloy were observed, too. These effects were connected with trapping of positrons at the grain boundaries-defects and in the short-range ordered regions in the liquid alloy. Also microscopic structure of sample before and after measurements cycles was observed.
7
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Thermodynamic model of crystallization and melting of small particles

26%
Samsonov V., Malkov O.
Open Physics
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2004
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vol. 2
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issue 1
90-103
EN
The size dependence of the nanocrystal melting temperature has been investigated based on a nonequilibrium thermodynamics approach. An expression has been derived for the melting temperature that, contrary to the classical Tomson formula, takes into account the metastable character of the crystal nucleus-melt shell equilibrium. Quantitative estimations have been carried out for small spherical particles of aluminum, tin, and lead.
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