Details
| Original language | English |
|---|---|
| Pages (from-to) | 231-239 |
| Number of pages | 9 |
| Journal | European journal of mineralogy |
| Volume | 8 |
| Issue number | 2 |
| Publication status | Published - 22 Apr 1996 |
Abstract
Hydrothermal syntheses in the system Na2O-SiO2-Al2O3-H2O, using cristobalite, corundum and mullite as starting substances, show simultaneous crystallization of basic hydrosodalite with basic cancrinite. The samples are characterized relative to their composition and the structure of the resulting products by 29Si and 27Al MAS-NMR spectroscopy in combination with thermal analysis and powder X-ray diffraction. By extending the reaction times up to 240h, two different mechanisms could be identified at 423 and 473 K: at elevated temperature, the formation of cancrinite starts earlier and the reaction rate is increased. In both cases, crystallization of the products is accompanied by a transformation of the cancrinite into sodalite.
Keywords
- Al and Si solid state NMR, Reaction kinetics, Sodalites
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
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In: European journal of mineralogy, Vol. 8, No. 2, 22.04.1996, p. 231-239.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Crystallization of a basic sodalite under hydrothermal conditions studied by MAS-NMR, XRD and DTA/DTG
AU - Mundus, Carsten
AU - Müller-Warmuth, Werner
AU - Buhl, Josef Christian
PY - 1996/4/22
Y1 - 1996/4/22
N2 - Hydrothermal syntheses in the system Na2O-SiO2-Al2O3-H2O, using cristobalite, corundum and mullite as starting substances, show simultaneous crystallization of basic hydrosodalite with basic cancrinite. The samples are characterized relative to their composition and the structure of the resulting products by 29Si and 27Al MAS-NMR spectroscopy in combination with thermal analysis and powder X-ray diffraction. By extending the reaction times up to 240h, two different mechanisms could be identified at 423 and 473 K: at elevated temperature, the formation of cancrinite starts earlier and the reaction rate is increased. In both cases, crystallization of the products is accompanied by a transformation of the cancrinite into sodalite.
AB - Hydrothermal syntheses in the system Na2O-SiO2-Al2O3-H2O, using cristobalite, corundum and mullite as starting substances, show simultaneous crystallization of basic hydrosodalite with basic cancrinite. The samples are characterized relative to their composition and the structure of the resulting products by 29Si and 27Al MAS-NMR spectroscopy in combination with thermal analysis and powder X-ray diffraction. By extending the reaction times up to 240h, two different mechanisms could be identified at 423 and 473 K: at elevated temperature, the formation of cancrinite starts earlier and the reaction rate is increased. In both cases, crystallization of the products is accompanied by a transformation of the cancrinite into sodalite.
KW - Al and Si solid state NMR
KW - Reaction kinetics
KW - Sodalites
UR - http://www.scopus.com/inward/record.url?scp=0029751126&partnerID=8YFLogxK
U2 - 10.1127/ejm/8/2/0231
DO - 10.1127/ejm/8/2/0231
M3 - Article
AN - SCOPUS:0029751126
VL - 8
SP - 231
EP - 239
JO - European journal of mineralogy
JF - European journal of mineralogy
SN - 0935-1221
IS - 2
ER -