Melting and evaporating sodium tellurite melts in low gravity drop shaft

Masaki Makihara, Chandra S. Ray, Delbert E. Day

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

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 languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSociety of Photo-Optical Instrumentation Engineers
Pages209-217
Number of pages9
ISBN (Print)0819432784
Publication statusPublished - Jan 1 1999
EventProceedings of the 1999 Materials Research in Low Gravity II - Denver, CO, USA
Duration: Jul 19 1999Jul 21 1999

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume3792
ISSN (Print)0277-786X

Other

OtherProceedings of the 1999 Materials Research in Low Gravity II
CityDenver, CO, USA
Period7/19/997/21/99

Fingerprint

microgravity
Gravitation
Melting
Sodium
melting
sodium
Glass
glass
tendencies
Crystallization
crystallization
Microgravity
Deceleration
deceleration
capsules
Chemical analysis
heaters
Platinum
Japan
chemical composition

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

Makihara, M., Ray, C. S., & Day, D. E. (1999). Melting and evaporating sodium tellurite melts in low gravity drop shaft. In Proceedings of SPIE - The International Society for Optical Engineering (pp. 209-217). (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 3792). Society of Photo-Optical Instrumentation Engineers.

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 proceedingConference contribution

Makihara, M, Ray, CS & Day, DE 1999, Melting and evaporating sodium tellurite melts in low gravity drop shaft. in Proceedings of SPIE - The International Society for Optical Engineering. Proceedings of SPIE - The International Society for Optical Engineering, vol. 3792, Society of Photo-Optical Instrumentation Engineers, pp. 209-217, Proceedings of the 1999 Materials Research in Low Gravity II, Denver, CO, USA, 7/19/99.
Makihara M, Ray CS, Day DE. Melting and evaporating sodium tellurite melts in low gravity drop shaft. In 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).
Makihara, Masaki ; Ray, Chandra S. ; Day, Delbert E. / Melting and evaporating sodium tellurite melts in low gravity drop shaft. Proceedings of SPIE - The International Society for Optical Engineering. Society of Photo-Optical Instrumentation Engineers, 1999. pp. 209-217 (Proceedings of SPIE - The International Society for Optical Engineering).
@inproceedings{ab41735f4ce44260aa80a2becbdf48c0,
title = "Melting and evaporating sodium tellurite melts in low gravity drop shaft",
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.",
author = "Masaki Makihara and Ray, {Chandra S.} and Day, {Delbert E.}",
year = "1999",
month = "1",
day = "1",
language = "English",
isbn = "0819432784",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "Society of Photo-Optical Instrumentation Engineers",
pages = "209--217",
booktitle = "Proceedings of SPIE - The International Society for Optical Engineering",

}

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 -