Mechanism of water and gas release during heat treatment of europium-doped lanthanum aluminate crystalsстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 30 июня 2021 г.
Аннотация:The release and content of water and gases in fine-crystalline lanthanum aluminate doped with europium (LaAlO3:Eu3+) was quantitatively studied for the first time using the method of kinetic thermodesorption mass spectrometry. LaAlO3:Eu3+ with an average size of 0.28 μm was synthesized in a two-stage regime: in a sub- and then in a supercritical water fluid. The main products of degassing during vacuum heat treatment were water and carbon dioxide. The amount of carbonate structures in the defects of the LaAlO3:Eu3+ crystal lattice increased with the use of Al(OH)3, La2O3, and Eu2O3 precursors with a long shelf life. The joint participation of hydroxyl and carbonate structures in the synthesis of a crystalline product is consistent with the detection of lanthanum hydroxycarbonate in intermediate synthesis products. The major amount of H2O and CO2 is released from LaAlO3:Eu3+ crystals at low temperatures – up to 600–800 °C. Knowledge of the degassing characteristics of LaAlO3:Eu3+ during heat treatment and sintering is necessary to produce a transparent ceramic material with excellent luminescence.