Solid Solutions CaF2–YF3 with Fluorite Structure Prepared on the Sol–Gel Route: Investigation by Multinuclear MAS NMR Spectroscopy

2014 ◽  
Vol 118 (36) ◽  
pp. 21066-21074 ◽  
Author(s):  
Thoralf Krahl ◽  
Gudrun Scholz ◽  
Erhard Kemnitz
Keyword(s):  
Nmr Spectroscopy ◽  
Solid Solutions ◽  
Sol Gel ◽  
Fluorite Structure ◽  
Mas Nmr

Room temperature sol–gel synthesis of crystalline Cs[V3O8]. Probing the hydration level of the interlamellar space by 51V and 133Cs MAS NMR spectroscopy

2008 ◽  
Vol 18 (31) ◽  
pp. 3702 ◽  
Author(s):  
Olivier Durupthy ◽  
Jocelyne Maquet ◽  
Christian Bonhomme ◽  
Thibaud Coradin ◽  
Jacques Livage ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Room Temperature ◽  
Sol Gel ◽  
Mas Nmr ◽  
Hydration Level ◽  
Interlamellar Space ◽  
Sol Gel Synthesis

Molecular vibrational analysis and MAS-NMR spectroscopy study of epilepsy drugs encapsulated in TiO2-sol–gel reservoirs

2006 ◽  
Vol 78A (3) ◽  
pp. 441-448 ◽  
Author(s):  
T. Lopez ◽  
J. Navarrete ◽  
R. Conde ◽  
J.A. Ascencio ◽  
J. Manjarrez ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Sol Gel ◽  
Vibrational Analysis ◽  
Mas Nmr ◽  
Spectroscopy Study ◽  
Tio2 Sol

ChemInform Abstract: Structural Characterization of the Li Argyrodites Li7PS6 and Li7PSe6 and Their Solid Solutions: Quantification of Site Preferences by MAS-NMR Spectroscopy.

ChemInform ◽  
2010 ◽  
Vol 41 (31) ◽  
pp. no-no
Author(s):  
Shiao Tong Kong ◽  
Oezguel Guen ◽  
Barbara Koch ◽  
Hans Joerg Deiseroth ◽  
Hellmut Eckert ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Solid Solutions ◽  
Structural Characterization ◽  
Mas Nmr ◽  
Site Preferences

Structural Characterisation of the Li Argyrodites Li7PS6 and Li7PSe6 and their Solid Solutions: Quantification of Site Preferences by MAS-NMR Spectroscopy

2010 ◽  
Vol 16 (17) ◽  
pp. 5138-5147 ◽  
Author(s):  
Shiao Tong Kong ◽  
Özgül Gün ◽  
Barbara Koch ◽  
Hans Jörg Deiseroth ◽  
Hellmut Eckert ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Solid Solutions ◽  
Mas Nmr ◽  
Structural Characterisation ◽  
Site Preferences

Solid solubility and transport properties of Ce1−xNdxO2−δ nanocrystalline solid solutions by a sol-gel route

2001 ◽  
Vol 16 (11) ◽  
pp. 3207-3213 ◽  
Author(s):  
Liping Li ◽  
Xiaomin Lin ◽  
Guangshe Li ◽  
Hiroshi Inomata
Keyword(s):  
Activation Energy ◽  
Solid Solutions ◽  
Solid Solubility ◽  
Oxygen Vacancies ◽  
Sol Gel ◽  
Broad Band ◽  
Sample Surface ◽  
Fluorite Structure ◽  
Lattice Parameter ◽  
Dopant Content

Ce1−xNdxO2−δ (x = 0.05 to 0.55) nanocrystalline solid solutions were prepared by a sol-gel route. X-ray diffraction analysis showed that Ce1−xNdxO2−δ crystallized in a cubic fluorite structure. The lattice parameter for the solid solutions increased linearly with the dopant content. The solid solubility of Nd3+ in ceria lattice was determined to be about x = 0.40 in terms of the nearly constant lattice parameters at a dopant level larger than x = 0.40. First-order Raman spectra for Ce1−xNdxO2−δ at a lower dopant content exhibited one band associated with the F2g mode. At higher dopant contents, F2g mode became broadened and asymmetric, and a new broad band appeared at the higher frequency side of the F2g mode. This new band was assigned to the oxygen vacancies. The electron paramagnetic resonance spectrum for x = 0.05 showed the presence of O2− adsorbed on sample surface at g = 2.02 and 2.00 and of Ce3+ with a lower symmetry at g = 1.97 and 1.94. Further increasing dopant content led to the disappearance of the signals for O2−. Impedance spectra showed the bulk and grain boundary conduction in the solid solutions. The bulk conduction exhibited a conductivity maximum and an activation energy minimum with increasing dopant content. Ce0.80Nd0.20O2−δ was determined to give promising conduction properties such as a relatively high conductivity of σ700 °C = 2.44 × 10−2 S cm−1 and moderate activation energy of Ea = 0.802 eV. The variations of conductivity and activation energy were explained in terms of relative content of oxygen vacancies Vö and defect associations {CeCe ′Vö}/{NdCe ′Vö}.

scholarly journals Sampling Method Affects HR-MAS NMR Spectra of Healthy Caprine Brain Biopsies

Metabolites ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 38
Author(s):  
Annakatrin Häni ◽  
Gaëlle Diserens ◽  
Anna Oevermann ◽  
Peter Vermathen ◽  
Christina Precht
Keyword(s):  
Nmr Spectroscopy ◽  
Sampling Method ◽  
Magic Angle Spinning ◽  
Mas Nmr ◽  
Magic Angle ◽  
1H Nuclear Magnetic Resonance ◽  
Rapid Changes ◽  
Tissue Degradation ◽  
Angle Spinning

The metabolic profiling of tissue biopsies using high-resolution–magic angle spinning (HR-MAS) 1H nuclear magnetic resonance (NMR) spectroscopy may be influenced by experimental factors such as the sampling method. Therefore, we compared the effects of two different sampling methods on the metabolome of brain tissue obtained from the brainstem and thalamus of healthy goats by 1H HR-MAS NMR spectroscopy—in vivo-harvested biopsy by a minimally invasive stereotactic approach compared with postmortem-harvested sample by dissection with a scalpel. Lactate and creatine were elevated, and choline-containing compounds were altered in the postmortem compared to the in vivo-harvested samples, demonstrating rapid changes most likely due to sample ischemia. In addition, in the brainstem samples acetate and inositols, and in the thalamus samples ƴ-aminobutyric acid, were relatively increased postmortem, demonstrating regional differences in tissue degradation. In conclusion, in vivo-harvested brain biopsies show different metabolic alterations compared to postmortem-harvested samples, reflecting less tissue degradation. Sampling method and brain region should be taken into account in the analysis of metabolic profiles. To be as close as possible to the actual situation in the living individual, it is desirable to use brain samples obtained by stereotactic biopsy whenever possible.

scholarly journals Spray‐dried sol‐gel glass‐ceramic powders based on the tunable thermal expansion of quartz and keatite solid solutions

2021 ◽  
Author(s):  
Alessio Zandona ◽  
Gundula Helsch ◽  
Aurina Martínez Arias ◽  
Alfred P. Weber ◽  
Joachim Deubener
Keyword(s):  
Thermal Expansion ◽  
Solid Solutions ◽  
Glass Ceramic ◽  
Sol Gel ◽  
Ceramic Powders ◽  
Spray Dried

Surface Species Formed during Aniline Methylation on Zeolite H–Y Investigated by in Situ MAS NMR Spectroscopy

2001 ◽  
Vol 203 (2) ◽  
pp. 375-381 ◽  
Author(s):  
Irina I Ivanova ◽  
Elena B Pomakhina ◽  
Alexander I Rebrov ◽  
Michael Hunger ◽  
Yuryi G Kolyagin ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Mas Nmr ◽  
Surface Species
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