Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Nukleonika

2 2013

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: ortho-positronium (o-Ps)

Sortuj według:

Ogranicz wyniki do:

Porosity structure in photon active glasses

Jasińska B., Śniegocka M., Reisfeld R., Zigansky E.

Nukleonika

2013

Vol. 58, No. 1

241-244

Two kinds of photon active glasses were investigated using positron annihilation lifetime spectroscopy (PALS). Both kinds of glasses were prepared using a sol-gel technique, doped by complex of ruthenium tris bipyridyl chloride. Glasses differed from the initial matrix: the first one was prepared using silicon oxide while the second one - zircon oxide. The ortho-positronium (o-Ps) lifetime and intensities were determined from lifetime spectra. Different porosity structure concluded from PALS measurements was found in both cases. In the silica based glasses small free volumes (angstrom size) and pores (from 1 to 10 nm) existed in the material. On the contrary, in zirconia based glasses small intermolecular voids were produced in the structure only, independently of the way of material preparation.

PALS investigation of resorcinol under high pressure

Tydda M., Jasińska B., Pieniążek A.

Nukleonika

2013

Vol. 58, No. 1

195-198

Two kinds of measurements were conducted with resorcinol at high pressure : the first one with the use of a mechanical press and the second one with the use of a gaseous compressor. In the second case, due to some gas penetrating the material structure, the lifetime spectra obtained were difficult to analyze. The free volumes in resorcinol were influenced both by high pressure and the gas coming into the crystallographic structure.