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The same crystal structure is found in numerous ionic compounds with formula AB 2, such as ceria (CeO 2), zirconia (cubic ZrO 2), uranium dioxide (UO 2). In the corresponding anti-structure, called the antifluorite structure, anions and cations are swapped, such as beryllium carbide (Be 2 C) or lithium oxide (Li 2 O), potassium sulfate (K 2 SO 4).
Calcium fluoride is a classic example of a crystal with a fluorite structure. Crystallographic information can be collected via x-ray diffraction, providing information on the locations of electron density within a crystal structure. Using modern software such as Olex2, [4] one can solve a crystal structure from crystallographic output files.
Rubidium sulfide has a cubic crystal similar to lithium sulfide, sodium sulfide and potassium sulfide, known as the anti-fluorite structure. Their space groups are ¯. Rubidium sulfide has a crystal lattice unit cell dimension of = 765.0 pm. [1]
A category for compounds with the same crystal structure as calcium fluoride (fluorite), or the structure of magnesium silicide (anti-fluorite). This category is also known by the Strukturbericht designation C1, and falls under the space group Fm 3 m (No. 225).
The same crystal structure is found in numerous ionic compounds with formula AB 2, such as CeO 2, cubic ZrO 2, UO 2, ThO 2, and PuO 2. In the corresponding anti-structure, called the antifluorite structure, anions and cations are swapped, such as Be 2 C.
It adopts "antifluorite structure," which means that the small K + ions occupy the tetrahedral (F −) sites in fluorite, and the larger S 2− centers occupy the eight-coordinate sites. Li 2 S , Na 2 S , and Rb 2 S crystallize similarly.
Lithium selenide is an inorganic compound that formed by selenium and lithium.It is a selenide with a chemical formula Li 2 Se. Lithium selenide has the same crystal form as other selenides, which is cubic, belonging to the anti-fluorite structure, the space group is ¯, each unit cell has 4 units.
Much like the rock salt structure, the fluorite structure (AB 2) is also an Fm 3 m structure but has 1:2 ratio of ions. The anti-fluorite structure is nearly identical, except the positions of the anions and cations are switched in the structure. They are designated Wyckoff positions 4a and 8c whereas the rock-salt structure positions are 4a ...
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