Intermediate products in solid‐state reactions of gadolinium oxide and ammonium dihydrogen phosphate

Abstract

The solid-state reactions of Gd 2 O 3 with NH 4 H 2 PO 4 using various molar ratios (3:6, 2:8, 1:6 and 1:8) of the reactants were investigated at different temperatures (350-1100°C) to observe the intermediate compounds.Analysis of the X-ray powder diffraction patterns of the products obtained at 350°C; for the compositions of 2:8, 1:6 and 1:8 molar ratios revealed the formation of a new compound, NH 4 GdHP 3 O 10 which was reported previously for Nd, Ho and Er. At higher temperatures, gadolinium tripolyphosphate was obtained for all of the molar ratios. On the other hand, the IR data of the products also confirmed the proposed reaction pathways.

Synthesis and characterization of 159 Gd-doped hydroxyapatite nanorods for bioapplications as theranostic systems

“…This band can shifted to 1382 cm À1 for doped samples resulting in a chemical interaction between Gd 3þ and PO 3À 4 [46]. Our proposal is that gadolinium ions substitute calcium in the lattice, as indicated by XRD analyses, resulting in strong interactions with phosphate and inhibiting the carbonate formation.…”