Formation of YAG from coprecipitated yttrium aluminium hydroxides

Abstract

Thermal decomposition of the amorphous coprecipitate of yttrium and aluminium hydroxides forming yttrium aluminium garnet has been investigated employing thermal analyses, X-ray diffraction and IR spectroscopy. On heating, the coprecipitate progressively loses water forming a stable but highly disordered hydroxy garnet which crystallizes at -1180 K and decomposes to YAG at -1290 K. Nucleation of the crystalline phase appears to begin at ~800 K.

Preparation of Y3Al5O12:Ce powders by microwave-induced combustion process and their luminescent properties

“…YAG and YAG-based phosphors have been prepared by several techniques, such as solid-state reaction [8,9], solgel [10], coprecipitation method [11,12], and hydrothermal method [13]. In this study, we used a new method called microwave-induced combustion synthesis to YAG:Ce powder.…”

Comparative study on the luminescent properties of Y3Al5O12:RE3+ (RE: Eu, Dy) phosphors synthesized by three methods

“…Several reports have proved that among the various factors to improve the performances of phosphors, synthesis method has appeared the most important [6][7][8]. Wide techniques have been reported to produce YAG phases such as solid-state synthesis [8,9], sol-gel [10] and citrate-gel process [11], coprecipitation method [12,13] and hydrothermal method [14], etc. In an earlier paper [15], we reported the influence of synthesis methods on the luminescence properties of YAG:Re (Re = Ce 3+ , Sm 3+ ,Tb 3+ ) phosphors.…”

Effect of process parameters on the synthesis of YAG nano-crystallites in supercritical solvent

“…The synthesis of single-phase YAG by the hydrothermal method may however require more extreme conditions, e.g., higher temperatures and pressures. Such a result can be explained in terms of supercritical fluid theory [23]. As is well-known, the supercritical temperature and pressure of water and ethanol are 374 • C, 22 MPa and 243 • C, 6.3 MPa, respectively.…”