Influence of ammonium hydrogen carbonate molar ratio on structural and morphological properties of Y₂O₃nanoparticles

Abstract

The co-precipitation synthesis is considered as one of the greatest wet chemical route to produce nanoparticles because of its yield and control over synthesis parameters. In this manuscript, Yttria (Y2O3) nanoparticles (YNPs) have been synthesized through direct titration precipitation process using ammonium hydrogen carbonate (AHC) as precipitant to metal ion molar ratio (M3+) in acidic medium condition. The molar ratio [R= (NH4HCO3)/(M3+)] varies from 0.35 M to 0.55 M with constant metal ion (M3+=0.1M) concentration. The influence of R-value on crystallographic structure, particle size, surface morphology of YNPs are comprehensively studied. Rietveld refined parameters confirm the formation of pure cubic yttria phase in calcined powders. The FTIR results confirm the presence of Y-O-Y and Y-O bands. The influence of R-value on the development of morphological aspects was observed using field emission scanning electron microscopy which shows pseudo spherical morphology with a particle size range of 24.63±5.6 nm to 31.46±5.1 nm. TGA/DSC results confirm the complete transformation of intermediate yttrium compounds to pure cubic Y2O3 single phase at a temperature of 780°C.

Size‐Controllable Synthesis of Submicro Spherical Yttrium Carbonate and In Situ Doping of Europium to Prepare Y2O3: Eu3+ Phosphor

“…Some notable peaks near 562 and 466 cm −1 appear after calcining 600 °C, which are caused primarily by the stretching vibration of Y–O. [ 17 ] TG‐DSC curves are shown in Figure 2e,f, three weight loss stages and endothermic peaks can be observed. According to the XRD, Raman, and FT‐IR results, the decomposition behavior of Y10 can be concluded in three parts: i) weight loss ratio of 10.28% from room temperature to 197 °C corresponds to the free water vaporization, ii) a slow weight loss of 11.10% from 197 to 591 °C stems from the crystalline water decomposition, and iii) weight sharply decreases from 591 to 775 °C should be attributed to the thermal decomposition of yttrium carbonate.…”