Aside from the sulfate, other compounds of barium find only niche applications.
- Barium oxide is used in a coating for the electrodes of fluorescent lamps, which facilitates the release of electrons.
- Barium carbonate is used in glassmaking. Being a heavy element, barium increases the refractive index and luster of the glass.
- Barium, typically as barium nitrate, is added to fireworks to impart them a green color The species responsible for the brilliant green is barium monochloride; in the absence of chlorine a yellow or "apple" green is produced instead.
- Barium peroxide can be used as a catalyst to start an aluminothermic reaction when welding rail tracks together. It can also be used in green tracer ammunition and as a bleaching agent.
- Barium titanate is a promising electroceramic
- Barium fluoride is used for optics in infrared applications because of its wide transparency range of 0.15–12 micrometers.
- YBCO was the first high-temperature superconductor that could be cooled by liquid nitrogen, as its transition temperature of 93 K exceeded the boiling point of nitrogen (77 K).
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