NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2021, 12 (2), P. 224–231
The effect of co-precipitation temperature on the crystallite size and aggregation/agglomeration of GdFeO3 nanoparticles
V. I. Popkov – Ioffe Institute, Saint Petersburg, 194021, Russia; email@example.com
Y. Albadi – Saint Petersburg State Institute of Technology, Saint Petersburg, 190013, Russia; Al-Baath University, Homs, 77, Syrian Arab Republic
In this work, a series of GdFeO3 nanopowders was successfully synthesized via a reverse co-precipitation technique at different solution temperatures (0, 25 and 50 °C) followed by thermal treatment. Co-precipitated hydroxides and heat treatment products were analyzed using EDXS, DTA-TGA, PXRD, ASA and LD methods. It was shown that the formation temperature of GdFeO3 nanoparticles varies in the range of 737.5–758.8 °C and total weight loss varies in the range of 23.6–26.4% depending on the temperature of initial solutions. The specific surface areas of nanopowders were found to be strongly dependent on the factor mentioned above and belong to 2.5–16.3 m2/g values interval. The hierarchical structure of the obtained nanopowders was established and the effect of co-precipitation temperature on the average crystallite (21.4–34.3 nm), aggregate (46.2–301.2 nm) and agglomerate (33.5–40.9 μm) sizes was discussed in detail.
Keywords: co-precipitation, gadolinium orthoferrite, nanoparticles, aggregation, agglomeration.
PACS 81.20.Fw, 61.46.+w, 75.20.-g