Rubidium telluride
Encyclopedia
Rubidium telluride or Rb2Te is a chemical compound of the elements rubidium
Rubidium
Rubidium is a chemical element with the symbol Rb and atomic number 37. Rubidium is a soft, silvery-white metallic element of the alkali metal group. Its atomic mass is 85.4678. Elemental rubidium is highly reactive, with properties similar to those of other elements in group 1, such as very rapid...

 and tellurium. It is a difficult compound to synthesize; this is in part due to the instability of the substance.

Rubidium telluride is prepared from the elements in liquid ammonia
Ammonia
Ammonia is a compound of nitrogen and hydrogen with the formula . It is a colourless gas with a characteristic pungent odour. Ammonia contributes significantly to the nutritional needs of terrestrial organisms by serving as a precursor to food and fertilizers. Ammonia, either directly or...

. It is a yellow-green powder that melts congruently at 775 °C (or 880 °C as two different values are reported).

This compound is very rare and there for are a limited number of suppliers. Pfaltz and Bauer sells Rb2Te for approximately 760 USD per gram (2010).

Rubidium telluride has found some uses as UV
Ultraviolet
Ultraviolet light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than X-rays, in the range 10 nm to 400 nm, and energies from 3 eV to 124 eV...

detectors in space.
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