Un nouvel ultraphosphate: CaYP7O20—préparation et structure cristalline

Inorganic Lanthanide Compounds with Complex Anions

“…To date four different structure types are known, as can be seen from Table . − There is one unique example for an ultra-phosphate with another composition. In CaYP 7 O 20 , the double-connected and the triple-linked [PO 4 ] tetrahedra are found in a ratio of 5:2, leading to the anionic network P 7 O 20 5- . The ultra-phosphates were of certain interest for a period of time because they were thought to be promising laser materials.…”

“…In CaYP 7 O 20 , the doubleconnected and the triple-linked [PO 4 ] tetrahedra are found in a ratio of 5:2, leading to the anionic network P 7 O 20 5-. 357 The ultra-phosphates were of certain interest for a period of time because they were thought to be promising laser materials. Unfortunately, large single crystals are hard to grow due to the decomposition of the compounds at higher temperatures.…”

Extended Condensed Ultraphosphate Frameworks with Monovalent Ions Combine Lithium Mobility with High Computed Electrochemical Stability

“…Similar to Li n− , where n = 2, 3, 4, 5, and 6. 91,92 With increasing n, the ratio of internal to branching PO 4 3− tetrahedra and the average value of the negative charges per P increases, the degree of condensation of PO 4 3− tetrahedra decreases, and ultraphosphates accordingly tend to adopt low-dimensional configurations. For example, the P 4 O 11 2− (n = 2) anion adopts 2D layers, the P 5 O 14 3− anion (n = 3) adopts both infinite 1D ribbons 93,94 and 2D layers while only 1D ribbons are observed for P 7 O 20 5− (n = 5) 92 and 0D finite groups for P 8 O 23 6− (n = 6).…”

“…91,92 With increasing n, the ratio of internal to branching PO 4 3− tetrahedra and the average value of the negative charges per P increases, the degree of condensation of PO 4 3− tetrahedra decreases, and ultraphosphates accordingly tend to adopt low-dimensional configurations. For example, the P 4 O 11 2− (n = 2) anion adopts 2D layers, the P 5 O 14 3− anion (n = 3) adopts both infinite 1D ribbons 93,94 and 2D layers while only 1D ribbons are observed for P 7 O 20 5− (n = 5) 92 and 0D finite groups for P 8 O 23 6− (n = 6). 6,16 In order to meet the specific ratio of internal and branching tetrahedra, the P 5 O 14 3− anion adopts an alternating arrangement of internal and branching tetrahedra, while ultraphosphates with smaller and larger n values feature the branching−branching and internal−internal tetrahedral connections, respectively.…”