Research Information System
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, vol.119, pp.122-125, 2018 (SCI-Expanded)
A new valence-mixed iron(III)-zinc(II)-copper(II) pyrophosphate, Cu-0.5(2+) Zn-0.5(2+) Fe-2(3+)(P2O74-)(2), has been synthesized by a dry-way method and structurally characterized by several techniques. The powder diffraction pattern of the new material shows that the pyrophosphate is isostructural with the iron(III)-iron(II) pyrophosphate Fe2+Fe23+(P2O74-)(2), crystallizing in an orthorhombic arrangement in the Pnma space group. Cu2+ Fe-2(3) (P2O74-)(2) was formed as a secondary phase, as determined both by X-ray diffraction and Mossbauer spectroscopy. Mossbauer spectroscopy and magnetometry measurements showed that Cu0.5Zn0.5Fe2(P2O7)(2) is paramagnetic at room temperature and the iron ions are in octahedral coordination. Neel temperature is about 3 K. Infrared and Raman spectroscopies were also used in this study to characterize the new pyrophosphate.