ChemInform Abstract: Synthesis and Structure of the Novel Fluorophosphate Na5Cr(PO4)2F2.

Abstract

Crystals of the title compound are grown by the method of spontaneous crystallization from melts in the system Na2O‐P2O5‐Cr2O3‐NaF.

Phase Transitions in the Na3M2(PO4)2F3 Family (M=Al3+, V3+, Cr3+, Fe3+, Ga3+): Synthesis, Thermal, Structural, and Magnetic Studies

“…The present study allows us to go further into the knowledge of these phases in the "elds of chemistry, thermal and magnetic behavior, and "nally crystal structures. From a chemical point of view the family was extended to the compounds with M" Al, Ga, V, and Cr (already reported by Nagorniy et al (30)). These phases can be prepared by solid state synthesis (Al, Cr, Fe), by hydrothermal route (Al, V, Fe, Ga), or by recrystallization of glasses (Al, Fe).…”

“…The investigated compounds Na 3 M 2 (PO 4 ) 2 ) have been prepared by hydrothermal synthesis or by solid state synthesis and characterized by thermal analyses (TGA, DTA, DSC), powder and single crystal X-ray works, or neutron di4raction. Several other ways of characterization have also been used such as di4raction by TEM, IR, magnetism, and MoK ssbauer spectrometry.…”

Complex phosphates containing mono- and trivalent cations

“…The framework structure of the (NH 4 ) 2 Ga 2 F 3 (PO 4 )(HPO 4 ) compound is more distorted as compared to the structure of (NH 4 )GaFPO 4 . Fluoride phosphates Na 5 M III F 2 (PO 4 ) 2 with M III = Al, Cr, Ga 91,92 crystallise in the trigonal system (Table 10), whereas an analogous iron compound is characterised by lower symmetry (orthorhombic). The Na 5 M III F 2 (PO 4 ) 2 compounds can be assigned to layered structures.…”

Systematic prediction of new ferroelectrics in space group P3

“…The structure of Na 5 CrF 2 (PO 4 ) 2 was determined by Nagornyi et al (1990) on the basis of 1101 re¯ections with F meas ! 3'(F meas ) and re®ned by block-diagonal least-squares using unpublished anisotropic displacement parameters to give R = 0.045 for the atomic coordinates in Table 8S.…”