Abstract
Sol-gel chemistry profoundly affects the crystallization of molecular aluminosilicate gels. Segregation of transition alumina-yielding species during gel synthesis results in the epitaxial nucleation of spinel at 980°C. When synthesis conditions leading to alumina segregation are avoided, t-mullite crystallizes at 980°C. However, it is shown, for the first time, that these gels are phase-separated prior to crystallization by a hydrothermal reaction known as dealumination. When the molecular gels are synthesized and heated to avoid this mechanism of phase separation, the gels crystallize directly to o-mullite at 700°C. This crystallization temperature for o-mullite in aluminosilicate gels is ∼ 500°C lower than those previously reported.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 213-221 |
| Number of pages | 9 |
| Journal | Journal of Non-Crystalline Solids |
| Volume | 147-148 |
| Issue number | C |
| DOIs | |
| State | Published - 1992 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry
Cite this
}
Chemistry-crystallization relations in molecular mullite gels. / Huling, Jeffrey C.; Messing, Gary L.
In: Journal of Non-Crystalline Solids, Vol. 147-148, No. C, 1992, p. 213-221.Research output: Contribution to journal › Article
TY - JOUR
T1 - Chemistry-crystallization relations in molecular mullite gels
AU - Huling, Jeffrey C.
AU - Messing, Gary L.
PY - 1992
Y1 - 1992
N2 - Sol-gel chemistry profoundly affects the crystallization of molecular aluminosilicate gels. Segregation of transition alumina-yielding species during gel synthesis results in the epitaxial nucleation of spinel at 980°C. When synthesis conditions leading to alumina segregation are avoided, t-mullite crystallizes at 980°C. However, it is shown, for the first time, that these gels are phase-separated prior to crystallization by a hydrothermal reaction known as dealumination. When the molecular gels are synthesized and heated to avoid this mechanism of phase separation, the gels crystallize directly to o-mullite at 700°C. This crystallization temperature for o-mullite in aluminosilicate gels is ∼ 500°C lower than those previously reported.
AB - Sol-gel chemistry profoundly affects the crystallization of molecular aluminosilicate gels. Segregation of transition alumina-yielding species during gel synthesis results in the epitaxial nucleation of spinel at 980°C. When synthesis conditions leading to alumina segregation are avoided, t-mullite crystallizes at 980°C. However, it is shown, for the first time, that these gels are phase-separated prior to crystallization by a hydrothermal reaction known as dealumination. When the molecular gels are synthesized and heated to avoid this mechanism of phase separation, the gels crystallize directly to o-mullite at 700°C. This crystallization temperature for o-mullite in aluminosilicate gels is ∼ 500°C lower than those previously reported.
UR - http://www.scopus.com/inward/record.url?scp=0026931262&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0026931262&partnerID=8YFLogxK
U2 - 10.1016/S0022-3093(05)80620-9
DO - 10.1016/S0022-3093(05)80620-9
M3 - Article
AN - SCOPUS:0026931262
VL - 147-148
SP - 213
EP - 221
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
SN - 0022-3093
IS - C
ER -