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Positronium in Small and Large Voids in Vycor Glass

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Ciesielski K., Dawidowicz A., Goworek T.
Acta Physica Polonica A
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1999
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vol. 95
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issue 4
483-486
EN
The intensities of ortho-positronium components related to the pores and to small voids in the bulk were determined for a series of Vycor glasses. The ratio of "pore fraction" to the total o-Ps yield depends on the specific surface area of the porous medium. The diffusion coefficient for o-Ps was found equal to 3.7×10^{-5} cm^{2}/s.
2
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Vapour Absorption in Melamine-Formaldehyde Resin

100%
Wawryszczuk J., Ciesielski K., Goworek J.
Acta Physica Polonica A
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2001
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vol. 99
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issue 3-4
523-528
EN
The effects of vapour absorption on positron annihilation in cross-linked polymer were investigated. Contrary to linear polymers, absorption of vapour in cross-linked resin leads to the shortening of o-Ps lifetime. In vacuum absorbed molecules diffuse out. At room temperature desorption of hexane and hexanol is not complete; full elimination of absorbed molecules requires sample temperature increase.
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Magnetocaloric Effect in Antiferromagnetic Half-Heusler Alloy DyNiSb

100%
Synoradzki K., Ciesielski K., Kaczorowski D.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
691-693
EN
The low-temperature magnetic, thermal and magnetocaloric properties of the half-Heusler compound DyNiSb were studied on polycrystalline samples. The temperature variations of the magnetization and the heat capacity revealed a phase transition from paramagnetic to antiferromagnetic state at the Néel temperature T_{N} = 3.1 K. The compound exhibits normal and inverse magnetocaloric effect with the isothermal magnetic entropy change reaching 5.2 J/(kg K) at 4.8 K for a magnetic field change of 3 T. The estimated refrigerant capacity is about 58 J/kg.
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