High-temperature molten salts structure analysis system

A system for determining atomic and molecular structure of salt as a function of temperature above and below melting, comprising:

• a tube containing a first end and a second end;
• a graphite rod located within the quartz tube, wherein the graphite rod contains a hollow center that extends from an open top portion of the rod to a location prior to a bottom of the rod, wherein the bottom portion of the rod is enclosed;
• a sample of salt located within the hollow center of the graphite rod;
• and
• a spacer that is stable at high temperature and does not react to the graphite rod, wherein the spacer positions the graphite rod at a desired position within the quartz tube,
• wherein the quartz tube is sealed with the graphite rod, salt, and spacer therein, and
• wherein the tube material does not change its state at a melting temperatures of the salt, the tube material does not release a contaminant when heated to the melting temperature of the salt, and the tube material does not block X-ray beams.