Glass Physics and Chemistry. Vol. 43, No. 1, Pages 98-105, 2017

L. P. Mezentseva^a^,*, I. Yu. Kruchinina^a^,^b, A. V. Osipov^a, V. L. Ugolkov^a, V. F. Popova^a, and S. K. Kuchaeva^a
Translated by D. Marinin

^aGrebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, St. Petersburg, 199034 Russia

^bUl’yanov (Lenin) St. Petersburg State Electrotechnical University LETI, St. Petersburg, 197376 Russia

Abstract—A series of physical–chemical studies of a series of binary REE orthophosphate systems has been performed: LaPO₄–DyPO₄–H₂O, LaPO₄–YPO₄–H₂O, LaPO₄–LuPO₄–H₂O, YPO₄–LuPO₄–H₂O, and YPO₄–ScPO₄–H₂O. Nanopowders of ${\text{Ln}}_{{1 - x}}^{{\text{'}}}{\text{Ln}}_{x}^{{{\text{''}}}}$PO₄ · nH₂O orthophosphates have been synthesized by the sol–gel method using direct and reverse precipitation techniques. Ceramic samples were produced from the nanopowders, and their physical–mechanical properties were determined depending on the thermal treatment temperature and duration. The ceramic samples’ thermal behavior has been investigated by the dilatometry method. The results have been compared depending on the technique of nanopowder synthesis.

Keywords: sol–gel synthesis, REE orthophosphate nanopowders, physical–chemical analysis, ceramic samples, dilatometry, physical–mechanical properties

Physical–Chemical Properties of Nanopowders and Ceramic Samples of REE Orthophosphates