Samarium(III) fluoride
Encyclopedia
Samarium fluoride (Sm
F3
) is a slightly hygroscopic solid fluoride
.
At room temperature, it has orthorhombic structure with space group
Pnma - β-YF3 type with lattice constant
s a = 6.669, b = 7.059, c = 4.405 (.10-1 nm). Above 495 °C, it has the rhombohedral LaF3 structure (space group P3cl) - with lattice constants a = 7.07, c = 7.24 (.10-1 nm).
Conditions/substances to avoid are: open flame
, moisture, strong acid
s.
Samarium
Samarium is a chemical element with the symbol Sm, atomic number 62 and atomic weight 150.36. It is a moderately hard silvery metal which readily oxidizes in air. Being a typical member of the lanthanide series, samarium usually assumes the oxidation state +3...
F3
Fluorine
Fluorine is the chemical element with atomic number 9, represented by the symbol F. It is the lightest element of the halogen column of the periodic table and has a single stable isotope, fluorine-19. At standard pressure and temperature, fluorine is a pale yellow gas composed of diatomic...
) is a slightly hygroscopic solid fluoride
Fluoride
Fluoride is the anion F−, the reduced form of fluorine when as an ion and when bonded to another element. Both organofluorine compounds and inorganic fluorine containing compounds are called fluorides. Fluoride, like other halides, is a monovalent ion . Its compounds often have properties that are...
.
At room temperature, it has orthorhombic structure with space group
Space group
In mathematics and geometry, a space group is a symmetry group, usually for three dimensions, that divides space into discrete repeatable domains.In three dimensions, there are 219 unique types, or counted as 230 if chiral copies are considered distinct...
Pnma - β-YF3 type with lattice constant
Lattice constant
The lattice constant [or lattice parameter] refers to the constant distance between unit cells in a crystal lattice. Lattices in three dimensions generally have three lattice constants, referred to as a, b, and c. However, in the special case of cubic crystal structures, all of the constants are...
s a = 6.669, b = 7.059, c = 4.405 (.10-1 nm). Above 495 °C, it has the rhombohedral LaF3 structure (space group P3cl) - with lattice constants a = 7.07, c = 7.24 (.10-1 nm).
Conditions/substances to avoid are: open flame
Flame
A flame is the visible , gaseous part of a fire. It is caused by a highly exothermic reaction taking place in a thin zone...
, moisture, strong acid
Acid
An acid is a substance which reacts with a base. Commonly, acids can be identified as tasting sour, reacting with metals such as calcium, and bases like sodium carbonate. Aqueous acids have a pH of less than 7, where an acid of lower pH is typically stronger, and turn blue litmus paper red...
s.