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SOLID-STATE SYNTHESIS, STRUCTURE, AND VIBRATIONAL-SPECTRA OF NAGDP2O7

1993-12-01
KIZILYALLI, M
DARRAS, M
NaGdP2O7 was synthesized by the solid-state reaction of Gd2O3 with Na2CO3 and 4(NH4)2HPO4 at 650°C. The X-ray powder diffraction data of NaGdP2O7 was indexed in the orthorhombic system with the approximate unit cell dimensions of a = 12.44 , b = 15.00, and c = 15.87 Å and the space group is Pmm2. Analysis of the vibrations of the P2O4-7 ion according to C2v symmetry and approximate band assignments for IR spectra are also reported in this work. The P-O-P band was found to be nonlinear, and some coincidences in the infrared and Raman spectra suggest that the most probable space group is noncentrosymmetric.