Darstellung von oligomeren und polymeren Alkali‐Aluminium‐ und Alkali‐Eisen‐Phosphaten

Abstract

Durch thermische Reaktionen in überschüssiger Phosphorsäure lassen sich in Abhängigkeit von der Temperatur, der Größe der Alkali‐Kationen MI und des atomaren Verhältnisses MI:MIII Alkali‐Aluminium‐ und Alkali‐Eisen‐Phosphate darstellen, die auf Grund ihrer Anionenkonstitution sieben verschiedenen Verbindungstypen angehören. Mit der Darstellung von Verbindungen des Typs MIM 2III[H2P3O10(P4O12)] wurden erstmalig Phosphate erhalten, in deren Kristallgitter sowohl lineare Triphosphat‐ als auch Cyclotetraphosphat‐Anionen enthalten sind.

Synthesis, crystal structure, and proton conductivity of KFe(H2P2O7)2

“…Although the melt was contaminated with amorphous products of ferric acetylacetonate decomposition, it contained a large number of KFe(H 2 P 2 O 7 ) 2 crystals of good quality. The XRD pattern of ground crystals was similar to that of KFe(H 2 P 2 O 7 ) 2 presented in [1], where, however, the unit-cell parameters and lattice symmetry of this compound were not reported.…”

“…In an earlier study of the systems K 2 O-Fe 2 O 3 -P 2 O 5 -H 2 O and K 2 O-Al 2 O 3 -P 2 O 5 -H 2 O in the range 373 − 573 K [1], KFe(H 2 P 2 O 7 ) 2 and KAl(H 2 P 2 O 7 ) 2 were shown to be primary phases in these systems. The thermal transformations of these compounds, prepared in the form of microcrystalline powders unsuitable for…”

Synthesis, Magnetism, and Crystal Structure of Li2Fe[(PO4)(HPO4)] and its Hydrogen Position Refinement

“…A total of 66 variables were refined to R 1 ϭ 0.055 and wR 2 ϭ 0.105 considering 2953 1) Further details of the crystal structure investigation are available from the Fachinformationszentrum Karlsruhe, D-76344 Eggenstein-Leopoldshafen (Germany), on quoting the depository number CSD-391239, the name of the authors, and citation of the paper. Fe(1) 0.00509 (7) 0.00534(6) 0.00545 (7) 0.00070(6) 0.00108(6) 0.00030(6) P(1) 0.00425(10) 0.00545(9) 0.00538(10) Ϫ0.00018 (7) 0.00120 (8) (with I > 2σ(I)) and 3879 contributing unique reflections, respectively. The atomic positional and displacement parameters, selected interatomic distances, bond angles and bond valence sums are listed in Table 2, Table 3, and (1)ϪFe (1) 127.92 (5) O (1)ϪLi (1)ϪO (4) 95.13(14) P(1)ϪO (2)ϪFe (1) 150.08 (7) O (4)ϪLi (1)ϪO (4) 85.77(13) P(1)ϪO (3)ϪFe (1) 156.40 (7) O (3)ϪLi (1)ϪO (4) 68.43 (11)…”

Spectroscopic characterization of mixed cation diphosphates of the type MIFeIIIP2O7 (with MI=Li, Na, K, Rb, Cs, Ag)

“…An important number of monovalent/trivalent cation diphosphates of stoichiometry M I M III P 2 O 7 are known. In particular, for M III ¼Fe III materials with all the alkaline cations (Li-Cs), NH 4 þ and Ag þ were characterized [1].…”