Thermoelectric experiment of a fluid lithium-ammonia solution in a U-shaped pyrex tube with highly pure vacuum state

Joonhyeon Jeon, Jibeom Kim

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

This paper describes a new thermoelectric experiment method using a 'U'-shaped Pyrex tube, inside which a vacuum is created, for the preparation and decomposition of fluid lithium-ammonia (Li-NH 3) solutions in anhydrous and deoxidized state. In addition, a real-time measuring system is used to simultaneously measure the generating current and voltage together with temperature change during solution decomposition. The experimental results show that pure Li-NH 3 solutions of desired concentration (1.0-3.0 MPM) are successfully made inside the tube and the temperature difference on both sides of the tube causes electron movement from high temperature (increase from -40 to -20°C) to low temperature (fixed at -40°C) regions of the tube. This potentially leads to concentration changes that produce different colors on both sides of the tube, and consequently the solution initially synthesized is divided into two substances that respectively undergo "a transition to the nonmetallic state" and "a transition to metallic state" in high and low temperature regions. Such phase transitions can occur repeatedly by swapping heat sources on both sides of the tube. It is concluded that a vacuum-state arrangement in the tube gives rise to a reversible reaction, which can rotate between two substances and continuously generate recursive output of thermoelectric powers.

Original languageEnglish
Pages (from-to)550-554
Number of pages5
JournalAdvanced Science Letters
Volume8
DOIs
StatePublished - 2012

Keywords

  • Lithium ammonia
  • Metal ammonia
  • Solvated electrons
  • Thermal electric
  • Thermoelectric materials

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