Abstract
Glasses of Na2O · xTeO2(x=2,4, and 6) compositions were remelted and evaporated while supported by a platinum heater coil in the low gravity (approx. 10-5 g) drop shaft at the Japan Microgravity Center (JAMIC). The evaporating species from all the melts, which formed a spherical cloud surrounding the melt during the few seconds low gravity time were identified to be amorphous particles of TeO2. These particles were highly spherical, 5 to 10μm in diameter, and were, on the average, 6 to 8 times larger than the particles grown from similar experiments at 1-g. The melt remaining after evaporation was splattered on to a glass plate positioned at about 3.5 cm directly below the melt during the high-g (approx. 8 to 10 g) deceleration of the drop capsule and crystallized almost instantaneously. The chemical composition of the crystallized splatters was same as that of the starting glass. The crystallization tendency of these sodium tellurite splatters was estimated to be at least 1000 times greater than that of an identical melt at 1-g. No suitable explanation was found for the high crystallization tendency of the drop shaft splatters, but a sudden 5 orders of magnitude increase in the gravity level is suspected to be a contributing factor for this effect.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of SPIE - The International Society for Optical Engineering |
| Publisher | Society of Photo-Optical Instrumentation Engineers |
| Pages | 209-217 |
| Number of pages | 9 |
| ISBN (Print) | 0819432784 |
| Publication status | Published - Jan 1 1999 |
| Event | Proceedings of the 1999 Materials Research in Low Gravity II - Denver, CO, USA Duration: Jul 19 1999 → Jul 21 1999 |
Publication series
| Name | Proceedings of SPIE - The International Society for Optical Engineering |
|---|---|
| Volume | 3792 |
| ISSN (Print) | 0277-786X |
Other
| Other | Proceedings of the 1999 Materials Research in Low Gravity II |
|---|---|
| City | Denver, CO, USA |
| Period | 7/19/99 → 7/21/99 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering
Cite this
Melting and evaporating sodium tellurite melts in low gravity drop shaft. / Makihara, Masaki; Ray, Chandra S.; Day, Delbert E.
Proceedings of SPIE - The International Society for Optical Engineering. Society of Photo-Optical Instrumentation Engineers, 1999. p. 209-217 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 3792).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Melting and evaporating sodium tellurite melts in low gravity drop shaft
AU - Makihara, Masaki
AU - Ray, Chandra S.
AU - Day, Delbert E.
PY - 1999/1/1
Y1 - 1999/1/1
N2 - Glasses of Na2O · xTeO2(x=2,4, and 6) compositions were remelted and evaporated while supported by a platinum heater coil in the low gravity (approx. 10-5 g) drop shaft at the Japan Microgravity Center (JAMIC). The evaporating species from all the melts, which formed a spherical cloud surrounding the melt during the few seconds low gravity time were identified to be amorphous particles of TeO2. These particles were highly spherical, 5 to 10μm in diameter, and were, on the average, 6 to 8 times larger than the particles grown from similar experiments at 1-g. The melt remaining after evaporation was splattered on to a glass plate positioned at about 3.5 cm directly below the melt during the high-g (approx. 8 to 10 g) deceleration of the drop capsule and crystallized almost instantaneously. The chemical composition of the crystallized splatters was same as that of the starting glass. The crystallization tendency of these sodium tellurite splatters was estimated to be at least 1000 times greater than that of an identical melt at 1-g. No suitable explanation was found for the high crystallization tendency of the drop shaft splatters, but a sudden 5 orders of magnitude increase in the gravity level is suspected to be a contributing factor for this effect.
AB - Glasses of Na2O · xTeO2(x=2,4, and 6) compositions were remelted and evaporated while supported by a platinum heater coil in the low gravity (approx. 10-5 g) drop shaft at the Japan Microgravity Center (JAMIC). The evaporating species from all the melts, which formed a spherical cloud surrounding the melt during the few seconds low gravity time were identified to be amorphous particles of TeO2. These particles were highly spherical, 5 to 10μm in diameter, and were, on the average, 6 to 8 times larger than the particles grown from similar experiments at 1-g. The melt remaining after evaporation was splattered on to a glass plate positioned at about 3.5 cm directly below the melt during the high-g (approx. 8 to 10 g) deceleration of the drop capsule and crystallized almost instantaneously. The chemical composition of the crystallized splatters was same as that of the starting glass. The crystallization tendency of these sodium tellurite splatters was estimated to be at least 1000 times greater than that of an identical melt at 1-g. No suitable explanation was found for the high crystallization tendency of the drop shaft splatters, but a sudden 5 orders of magnitude increase in the gravity level is suspected to be a contributing factor for this effect.
UR - http://www.scopus.com/inward/record.url?scp=0032632020&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0032632020&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:0032632020
SN - 0819432784
T3 - Proceedings of SPIE - The International Society for Optical Engineering
SP - 209
EP - 217
BT - Proceedings of SPIE - The International Society for Optical Engineering
PB - Society of Photo-Optical Instrumentation Engineers
ER -