Zobrazeno 1 - 10
of 44
pro vyhledávání: '"Roman Pielaszek"'
Publikováno v:
Zeitschrift für Kristallographie Supplements. 2009:255-260
Materials with MgO nanocrystallites were prepared by sol-gel synthesis. Alcogels were dried either supercritically at 538 K or in supercritical CO2. Conventional drying was also applied. Structure studies were performed by X-ray diffraction, scanning
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::20930401d8bbe38a4d910172238536b4
https://doi.org/10.1524/zksu.2009.0037
https://doi.org/10.1524/zksu.2009.0037
Autor:
Krzysztof J. Kurzydłowski, Tomasz Strachowski, Sergyi Yatsunenko, Ewa Grzanka, Witold Lojkowski, Aharon Gedanken, Anita Tomaszewska-Grzeda, Marek Godlewski, H. Matysiak, Roman Pielaszek, A. Opalińska
Publikováno v:
Journal of Nanoparticle Research. 11:1991-2002
ZnO nanopowders doped with Mn2+, Ni2+, Co2+ and Cr3+ ions have been synthesised for the first time using a solvothermal reaction with microwave heating. The nanopowders were produced from a solution of zinc acetate and manganese (II), chromium (III),
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::22513c7172d6aefb03160e6f71918f7b
https://doi.org/10.1007/s11051-008-9559-9
https://doi.org/10.1007/s11051-008-9559-9
Autor:
Roman Pielaszek, Grzegorz Dercz, Janusz J. Malinowski, Krystian Prusik, L. Pająk, Wojciech Pudło
Publikováno v:
Solid State Phenomena. 130:203-206
Wet gel obtained by sol-gel technique was dried in supercritical CO2 to prepare hydrated form of magnesium oxide. Calcination at 723 K under vacuum yielded nanocrystalline MgO aerogel. Structure studies were performed by X-ray diffraction, scanning a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::be151351c9a8e20c50c269afa0a338a0
https://doi.org/10.4028/www.scientific.net/ssp.130.203
https://doi.org/10.4028/www.scientific.net/ssp.130.203
Publikováno v:
Solid State Phenomena. 129:145-150
In this study a series of 3D models for curved [100] grain boundaries (GBs) in pure α-iron have been constructed. Each model consisted of a spherical grain, with an initial size of about 9 nm, surrounded by a large single-crystal. Different orientat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b01e7a2a6031ffcb67f164a4173280c0
https://doi.org/10.4028/www.scientific.net/ssp.129.145
https://doi.org/10.4028/www.scientific.net/ssp.129.145
Autor:
Krzysztof J. Kurzydłowski, Witold Łojkowski, A. Opalińska, H. Matysiak, Roman Pielaszek, Tomasz Wejrzanowski
Publikováno v:
Applied Surface Science. 253:204-208
The size, shape and surface topology have a strong influence on powders properties, such as: mechanical, optical, catalytic, etc. In addition, when particles have a nanometer size, the dispersion of these features plays an important role. There are a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::03cb0fe06c8fae386acf638813078917
https://doi.org/10.1016/j.apsusc.2006.05.089
https://doi.org/10.1016/j.apsusc.2006.05.089
Publikováno v:
Solid State Phenomena. 114:313-320
Th effect of diffraction peak broadening is commonly used as a convenient tool for the grain size determination of fine crystalline powders. Quantitative analysis of the peak profile also allows the size distribution to be determined, providing compl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ee34f8093f86fa4580df857668902ee4
https://doi.org/10.4028/www.scientific.net/ssp.114.313
https://doi.org/10.4028/www.scientific.net/ssp.114.313
Autor:
Roman Pielaszek
Publikováno v:
Solid State Phenomena. 114:303-312
One of the most general diffraction laws, the Debye equation, is rewritten for the special case of a crystalline materials. The Debye formula obtained for crystals has two components: structural and microstructural (diffraction line position and prof
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eb5680cc727aa64d8210ba1c84254c69
https://doi.org/10.4028/www.scientific.net/ssp.114.303
https://doi.org/10.4028/www.scientific.net/ssp.114.303
Autor:
Roman Pielaszek
Publikováno v:
Journal of Alloys and Compounds. 382:128-132
Well-established Scherrer method allows for determination of the average grain size 〈R〉 of a crystalline powder by measurement of full width at half maximum (FWHM) of the diffraction peak profile. We propose an enhancement of this classical metho
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8c05accef543766f9ed9df15e355e00c
https://doi.org/10.1016/j.jallcom.2004.05.040
https://doi.org/10.1016/j.jallcom.2004.05.040
Autor:
Stanislaw Gierlotka, S Werner, Bogdan F. Palosz, W. Palosz, S. Stelmakh, Roman Pielaszek, Ulli Bismayer, Ewa Grzanka
Publikováno v:
Journal of Physics: Condensed Matter. 16:S353-S377
Application of in situ high pressure powder diffraction technique for examination of specific structural properties of nanocrystals based on the experimental data of SiC nanocrystalline powders of 2 to 30 nrn diameter in diameter is presented. Limita
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::827fef1ac99caceb0e0625615d149033
https://doi.org/10.1088/0953-8984/16/5/003
https://doi.org/10.1088/0953-8984/16/5/003
Autor:
Stanislaw Gierlotka, Bogdan F. Palosz, Witold Palosz, Roman Pielaszek, Ulrich Bismayer, Svetlana Stelmakh, P. Jóvári, J. Neuefeind, Ewa Grzanka
Publikováno v:
Materials Science Forum. :39-44
A considerable fraction of atoms in nanosize particles is at the grain surface (due to the small size of the crystals). We assume that the surface atoms form a separate structural phase relative to the bulk of the grain (the core). Therefore, one set
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4cbe896d55ed0cf86375afd09cac422a
https://doi.org/10.4028/www.scientific.net/msf.443-444.39
https://doi.org/10.4028/www.scientific.net/msf.443-444.39