Samarium(III) fluoride ( Sm F₃) is a slightly

hygroscopic Hygroscopy is the phenomenon of attracting and holding water molecules via either absorption or adsorption from the surrounding environment, which is usually at normal or room temperature. If water molecules become suspended among the substance ...

solid

fluoride Fluoride (). According to this source, is a possible pronunciation in British English. is an inorganic, monatomic anion of fluorine, with the chemical formula (also written ), whose salts are typically white or colorless. Fluoride salts typ ...

. At room temperature, it has

orthorhombic In crystallography, the orthorhombic crystal system is one of the 7 crystal systems. Orthorhombic lattices result from stretching a cubic lattice along two of its orthogonal pairs by two different factors, resulting in a rectangular prism with a r ...

structure with space group ''Pnma'' – β-YF₃ type with lattice constants ''a'' = 666,9 pm, ''b'' = 705,9 pm, ''c'' = 440,5 pm. Above 495 °C, it has the rhombohedral LaF₃ structure (space group ''P3cl'') – with lattice constants ''a'' = 707, ''c'' = 724 pm.K Rotereau et al.: ''The high-temperature phase transition in samarium fluoride, SmF₃: structural and vibrational investigation'', J. Phys.: Condens. Matter, 1998, 10, 1431–1446, . Conditions/substances to avoid are: open

flame A flame (from Latin ''flamma'') is the visible, gaseous part of a fire. It is caused by a highly exothermic chemical reaction taking place in a thin zone. When flames are hot enough to have ionized gaseous components of sufficient density they ...

, moisture, strong

acid In computer science, ACID ( atomicity, consistency, isolation, durability) is a set of properties of database transactions intended to guarantee data validity despite errors, power failures, and other mishaps. In the context of databases, a sequ ...

References

Fluorides Samarium compounds Lanthanide halides {{inorganic-compound-stub