Abstract
NaGdP 2O 7 was synthesized by the solid-state reaction of Gd 2O 3 with Na 2CO 3 and 4(NH 4) 2HPO 4 at 650°C. The X-ray powder diffraction data of NaGdP 2O 7 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 P 2O 4- 7 ion according to C 2v 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.
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