Details
| Original language | English |
|---|---|
| Pages (from-to) | 100-105 |
| Number of pages | 6 |
| Journal | Microporous and Mesoporous Materials |
| Volume | 203 |
| Issue number | C |
| Early online date | 18 Oct 2014 |
| Publication status | Published - Feb 2015 |
Abstract
|Na8(NO2)2|[GaGeO4]6 sodalite was synthesized in a two-step process, starting with the formation of gallogermanate basic-hydro-sodalite under mild hydrothermal conditions (1) followed by hydrothermal treatment in concentrated NaNO2 solution (2). The presence of NO2- in the sodalite framework was verified by FTIR and Raman spectroscopy. Crystal structure refinements were performed in the space group P4¯3n from X-ray powder diffraction data using the Rietveld method. a = 915.28(1) pm, V = 766.8(1) × 10-6 pm3, RB = 1.92%. The nitrogen atoms were refined on the 8e (x, x, x) crystallographic position with occupancy. Temperature-dependent properties were investigated by TG-DTA and in-situ X-ray powder diffraction. Debye-Anharmonicity model fit evaluation of the thermal expansion coefficient and the temperature-dependent cell volume behavior indicate intra-cage nitrite to nitrate oxidation around 850 K, confirmed by ex-situ FTIR spectroscopy. The sodalite framework decomposition follows around 935 K, resulting in the beryllonite-type NaGaGeO4.
Keywords
- Crystal structure, Inorganic compounds, Microporous materials, Thermal expansion, X-ray diffraction
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
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In: Microporous and Mesoporous Materials, Vol. 203, No. C, 02.2015, p. 100-105.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Synthesis, crystal structure and temperature-dependent properties of gallogermanate nitrite sodalite |Na8(NO2)2|[GaGeO4]6
AU - Poltz, Irma
AU - Robben, Lars
AU - Buhl, Josef Christian
AU - Gesing, Thorsten M.
N1 - Funding Information: We gratefully acknowledge the Deutsche Forschungsgemeinschaft (DFG) for the financial support in the Heisenberg program (GE1981/3-1 and GE1981/3-2). IP likes to thank the University Bremen for her PhD stipendium. Additionally, we like to thank Peter Nowaczyk (Universität Hannover) for the data provided from his Bachelor thesis and project work.
PY - 2015/2
Y1 - 2015/2
N2 - |Na8(NO2)2|[GaGeO4]6 sodalite was synthesized in a two-step process, starting with the formation of gallogermanate basic-hydro-sodalite under mild hydrothermal conditions (1) followed by hydrothermal treatment in concentrated NaNO2 solution (2). The presence of NO2- in the sodalite framework was verified by FTIR and Raman spectroscopy. Crystal structure refinements were performed in the space group P4¯3n from X-ray powder diffraction data using the Rietveld method. a = 915.28(1) pm, V = 766.8(1) × 10-6 pm3, RB = 1.92%. The nitrogen atoms were refined on the 8e (x, x, x) crystallographic position with occupancy. Temperature-dependent properties were investigated by TG-DTA and in-situ X-ray powder diffraction. Debye-Anharmonicity model fit evaluation of the thermal expansion coefficient and the temperature-dependent cell volume behavior indicate intra-cage nitrite to nitrate oxidation around 850 K, confirmed by ex-situ FTIR spectroscopy. The sodalite framework decomposition follows around 935 K, resulting in the beryllonite-type NaGaGeO4.
AB - |Na8(NO2)2|[GaGeO4]6 sodalite was synthesized in a two-step process, starting with the formation of gallogermanate basic-hydro-sodalite under mild hydrothermal conditions (1) followed by hydrothermal treatment in concentrated NaNO2 solution (2). The presence of NO2- in the sodalite framework was verified by FTIR and Raman spectroscopy. Crystal structure refinements were performed in the space group P4¯3n from X-ray powder diffraction data using the Rietveld method. a = 915.28(1) pm, V = 766.8(1) × 10-6 pm3, RB = 1.92%. The nitrogen atoms were refined on the 8e (x, x, x) crystallographic position with occupancy. Temperature-dependent properties were investigated by TG-DTA and in-situ X-ray powder diffraction. Debye-Anharmonicity model fit evaluation of the thermal expansion coefficient and the temperature-dependent cell volume behavior indicate intra-cage nitrite to nitrate oxidation around 850 K, confirmed by ex-situ FTIR spectroscopy. The sodalite framework decomposition follows around 935 K, resulting in the beryllonite-type NaGaGeO4.
KW - Crystal structure
KW - Inorganic compounds
KW - Microporous materials
KW - Thermal expansion
KW - X-ray diffraction
UR - http://www.scopus.com/inward/record.url?scp=84926178716&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2014.10.007
DO - 10.1016/j.micromeso.2014.10.007
M3 - Article
AN - SCOPUS:84926178716
VL - 203
SP - 100
EP - 105
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
SN - 1387-1811
IS - C
ER -