Promethium(III) chloride

Promethium(III) chloride
Names
Glowing powder mixture of promethium(III) chloride and zinc sulfide
Crystal structure
Other names Promethium chloride; Promethium trichloride
Identifiers
CAS Number	13779-10-7
ECHA InfoCard	100.034.004
Properties
Chemical formula	PmCl₃
Molar mass	253 g/mol
Density	4.19 g/cm³ (calc., XRD)^[1]
Melting point	655 °C (1,211 °F; 928 K)^[2]
Structure
Crystal structure	Trigonal, hP8
Space group	P6₃/m, No. 176^[1]
Related compounds
Other anions	Promethium(III) oxide
Other cations	Neodymium(III) chloride, Samarium(III) chloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Promethium(III) chloride is a chemical compound of promethium and chlorine with the formula PmCl₃.

Applications

Promethium(III) chloride has been used to generate long-lasting glow in signal lights and buttons. This application relied on the unstable nature of promethium, which emitted beta radiation (electrons) with a half-life of several years. The electrons were absorbed by a phosphor, generating visible glow.^[3] Contrary to most other radioactive elements, promethium did not emit alpha particles that would degrade the phosphor.^[4]

References

1 2 Weigel, F.; Scherer, V. (1967). "Die Chemie des Promethiums". Radiochimica Acta. 7. doi:10.1524/ract.1967.7.1.40.
↑ Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.84. ISBN 1439855110.
↑ Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.28. ISBN 1439855110.
↑ Lavrukhina, A. K.; Pozdnyakov, A. A. (1966). Аналитическая химия технеция, прометия, астатина и франция (Analytical Chemistry of Technetium, Promethium, Astatine, and Francium) (in Russian). Nauka. p. 118.

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