Zobrazeno 1 - 10
of 60
pro vyhledávání: '"Roman Gajda"'
Autor:
Marcin Stachowicz, Roman Gajda, Agnieszka Huć, Jan Parafiniuk, Anna Makal, Szymon Sutuła, Pierre Fertey, Krzysztof Woźniak
Publikováno v:
Scientific Reports, Vol 13, Iss 1, Pp 1-9 (2023)
Abstract As a result of external compression applied to crystals, ions relax, in addition to shortening the bond lengths, by changing their shape and volume. Modern mineralogy is founded on spherical atoms, i.e., the close packing of spheres, ionic o
Externí odkaz:
https://doaj.org/article/2b3f712246b040da8527ec07b14b0c59
Autor:
Michal L. Chodkiewicz, Roman Gajda, Barbara Lavina, Sergey Tkachev, Vitali B. Prakapenka, Przemyslaw Dera, Krzysztof Wozniak
Publikováno v:
IUCrJ, Vol 9, Iss 5, Pp 573-579 (2022)
Water is an essential chemical compound for living organisms, and twenty of its different crystal solid forms (ices) are known. Still, there are many fundamental problems with these structures such as establishing the correct positions and thermal mo
Externí odkaz:
https://doaj.org/article/107bff11c12b473f8d469d163a701d1d
Publikováno v:
IUCrJ, Vol 9, Iss 1, Pp 146-162 (2022)
Pressure is well known to dramatically alter physical properties and chemical behaviour of materials, much of which is due to the changes in chemical bonding that accompany compression. Though it is relatively easy to comprehend this correlation in t
Externí odkaz:
https://doaj.org/article/c8d49be574e84789acfdb2452e7f6ec1
Autor:
Roman Gajda, Marcin Stachowicz, Anna Makal, Szymon Sutuła, Jan Parafiniuk, Pierre Fertey, Krzysztof Woźniak
Publikováno v:
IUCrJ, Vol 7, Iss 3, Pp 383-392 (2020)
X-ray diffraction studies of crystals under pressure and quantitative experimental charge density analysis are among the most demanding types of crystallographic research. A successful feasibility study of the electron density in the mineral grossula
Externí odkaz:
https://doaj.org/article/8d3cc0c8dcf44804bf787dfee71eb045
Publikováno v:
Molecules, Vol 24, Iss 6, p 1107 (2019)
The crystal structure of 1-(pyren-1-yl)but-2-yn-1-one ( 1 a , a polynuclear aromatic hydrocarbon displaying enhanced luminescence in the solid state, has been re-determined at several pressures ranging from atmospheric up to 3 GPa using a Diamond Anv
Externí odkaz:
https://doaj.org/article/2bceef83ac1f4723b525fac3243291c3
Publikováno v:
Crystal Growth & Design. 23:862-872
Publikováno v:
Dalton Transactions. 51:14865-14874
A H4B4O92− ion which makes up the (NH4)2B4O5(OH)4·2H2O crystal structure has two types of boron–oxygen bonds, i.e. single B–O bonds and an intermediate between single and double BO bonds.
Publikováno v:
IUCrJ
IUCrJ, Vol 9, Iss 1, Pp 146-162 (2022)
IUCrJ, Vol 9, Iss 1, Pp 146-162 (2022)
Experimental and theoretical charge density investigations performed for langbeinite allow for detailed examination of the redistribution of electron density under pressure both within atomic basins as well as at atomic positions.
Pressure is we
Pressure is we
Autor:
Pierre Fertey, Anna Makal, Marcin Stachowicz, Krzysztof Woźniak, Szymon Sutuła, Jan Parafiniuk, Roman Gajda
Publikováno v:
IUCrJ
IUCrJ, Vol 7, Iss 3, Pp 383-392 (2020)
IUCrJ, Vol 7, Iss 3, Pp 383-392 (2020)
A successful feasibility study of experimental electron density in the mineral grossular under 1 GPa pressure was conducted at the CRISTAL beamline at the SOLEIL synchrotron. Such studies allow for laboratory simulations of processes that take place
Crystal morphology fixed by interplay of π-stacking and hydrogen bonds – the case of 1-hydroxypyrene
Publikováno v:
CrystEngComm. 21:1701-1717
The crystal structure of 1-hydroxypyrene fluorophore has been determined for the first time. Despite the simplicity of the molecule itself and the relatively low symmetry of the crystal structure (space group P21), the specific molecular arrangement