The layered iron phosphate KMgFe(PO4)2: Crystal structure, Mössbauer spectroscopy and ionic conductivity

Structural study and physical properties of a new phosphate KCuFe(PO4)2

“…From the dielectric response one can obtain, among others, important information on the relaxation processes taking place in the system. The KMgFe(PO 4 ) 2 crystallizes in the C2/c space group and presents a bi-dimensional structure [5]; the structure of the second one is described above. Fig.…”

“…To achieve this purpose, we have applied different representations to analyze the dielectric data in the title compounds whose structures are very different. KMgFe(PO 4 ) 2 phosphate shows a 2D-structure and the mobility of the K þ cations is more feasible [5] whereas the KCuFe(PO 4 ) 2 compound possesses a 3D structure and therefore the mobility of the K þ cations is highly difficult.…”

“…In this paper, we report the synthesis, structural characterization and physical properties of a new phosphate KCuFe(PO 4 ) 2 , and the electrical behavior is compared with KMgFe(PO 4 ) 2 which shows a bi-dimensional structure as we have recently reported [5].…”

“…In this sense, the aim of this work is to study the relations between structure and properties of two phosphates, KMgFe(PO 4 ) 2 [5] and KCuFe(PO 4 ) 2 . The stoichiometry of these compounds could be related with the Ca 3 (PO 4 ) 2 one, where the Ca 2 þ can be substituted by various cations [6] and with the Ca 3 (VO 4 ) 2 one which is a high temperature ferroelectric (FE) with a phase transition temperature of T c ¼1383 K [7].…”

Crystal structure and thermal stability of new iron phosphates KMFe(PO4)2 (M = Ni, Mg, and Co)

“…As a part of our investigation on the A 2 O-MO-Fe 2 O 3 -P 2 O 5 systems, where A and M are alkali and divalent cations respectively, we reported the crystal structures and physical characterization of phosphates KMgFe(PO 4 ) 2 [7] and KCuFe(PO 4 ) 2 [8]. These two phases have similar stoichiometries, but very different structures.…”