Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Surface Hydroxyl OH Defects of η-Al2O3 and χ-Al2O3 by Solid State NMR, XRD, and DFT Calculations. / Khabibulin, Dzhalil F.; Papulovskiy, Evgeniy; Andreev, Andrey S. и др.
в: Zeitschrift fur Physikalische Chemie, Том 231, № 4, 01.04.2017, стр. 809-825.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Surface Hydroxyl OH Defects of η-Al2O3 and χ-Al2O3 by Solid State NMR, XRD, and DFT Calculations
AU - Khabibulin, Dzhalil F.
AU - Papulovskiy, Evgeniy
AU - Andreev, Andrey S.
AU - Shubin, Aleksandr A.
AU - Volodin, Alexander M.
AU - Zenkovets, Galina A.
AU - Yatsenko, Dmitriy A.
AU - Tsybulya, Sergey V.
AU - Lapina, Olga B.
PY - 2017/4/1
Y1 - 2017/4/1
N2 - For the first time, the detailed structure of χ-Al2O3 and η-Al2O3 surface has been established by implementing the NMR crystallography approach. The surface of η-Al2O3 has been demonstrated to be formed primarily by the (111) facets, while the χ-Al2O3 surface is a combination of (111) and (110) facets. This observation supports the block model of aluminum oxides previously proposed by Tsybulya and Kryukova [S. V. Tsybulya, G. N. Kryukova, Phys. Rev. B 77 (2008) 024112.]. The additional terminal OH groups, observed experimentally and not contributing to (111) and (110) theoretical calculations, are considered to be bonded to the tetrahedral aluminum sites. Their origin is related to the junctions of crystallographic faces of spinel building blocks, being a part of discussed model. Higher content of these terminal OH groups in χ-Al2O3 is a result of more junctions in the case of its more mosaic structure compared to η-Al2O3.
AB - For the first time, the detailed structure of χ-Al2O3 and η-Al2O3 surface has been established by implementing the NMR crystallography approach. The surface of η-Al2O3 has been demonstrated to be formed primarily by the (111) facets, while the χ-Al2O3 surface is a combination of (111) and (110) facets. This observation supports the block model of aluminum oxides previously proposed by Tsybulya and Kryukova [S. V. Tsybulya, G. N. Kryukova, Phys. Rev. B 77 (2008) 024112.]. The additional terminal OH groups, observed experimentally and not contributing to (111) and (110) theoretical calculations, are considered to be bonded to the tetrahedral aluminum sites. Their origin is related to the junctions of crystallographic faces of spinel building blocks, being a part of discussed model. Higher content of these terminal OH groups in χ-Al2O3 is a result of more junctions in the case of its more mosaic structure compared to η-Al2O3.
KW - DFT GIPAW
KW - solid-state NMR
KW - surface OH-groups
KW - transitional aluminas
KW - IR SPECTROSCOPIES
KW - STRUCTURAL MODELS
KW - SITES
KW - TRANSITIONAL ALUMINAS
KW - CRYSTALLOGRAPHY
KW - GAMMA-ALUMINA SURFACES
KW - GENERALIZED GRADIENT APPROXIMATION
KW - MAS
UR - http://www.scopus.com/inward/record.url?scp=85012252951&partnerID=8YFLogxK
U2 - 10.1515/zpch-2016-0822
DO - 10.1515/zpch-2016-0822
M3 - Article
AN - SCOPUS:85012252951
VL - 231
SP - 809
EP - 825
JO - Zeitschrift fur Physikalische Chemie
JF - Zeitschrift fur Physikalische Chemie
SN - 0942-9352
IS - 4
ER -
ID: 10036328