Influence of pH values on (Nd+Y):Al molar ratio of Nd:YAG nanopowders and preparation of transparent ceramics

Effect of La2O3 on microstructures and laser properties of Nd:YAG ceramics

“…Thus, tremendous efforts have been made to develop synthesis methods for YAG ceramics [8][9][10][11][12][13][14][15]. In order to fabricate high-transparency Nd:YAG ceramics, pores should be eliminated as much as possible [16].…”

Formation and calcination temperature-dependent sintering activity of YAG precursor synthesized via reverse titration method

“…Since then the ceramics have been able to exhibit a laser output of over 1460 W. As a result, the co-precipitation method with ammonium hydrogen carbonate as the precipitant became one of the favored processes for the preparation of YAG nanopowder [18][19][20][21][22][23]. The co-precipitation methods can mainly be generally divided into two kinds according to the sequence of reactants combination; one is the normal titration co-precipitation process [24], in which the precipitant solution is dropped into a mixed solution of the component cations to obtain the precipitate, and the other is the reverse titration co-precipitation process, in which the mixed cation solution is dropped into the precipitant solution. Researchers have deduced that composition homogeneity of the YAG precursor obtained by reverse titration is better than that from normal titration co-precipitation process, because of the difference in the solubility products of Y 3+ and Al 3+ .…”

“…As is well known, fabrication of YAG powders is a complex process. Many factors, such as reaction temperature, final pH values [24], period of aging, and dosage of ammonium sulfate, would affect composition, morphology, and the final properties of the precursor. Moreover, the calcination process is also another important factor that affects sintering properties of the YAG powder.…”

Dispersion of concentrated aqueous neodymia–yttria–alumina mixture with ammonium poly(acrylic acid) as dispersant

“…Although there are three different YAG ceramic fabrication processes, including nanoparticle preparation, green body formation, and sintering, in attempting to control the porosity of the ceramic, the effect of the formation process is often ignored. The reported YAG formation methods are typically dry-pressing [4][5][6][7][8][9][10], iso-static pressing [6,9,11,12] and a few reports that indicate using the slip casting method [13][14][15][16]. Generally speaking, using a green body obtained from a press formation method makes it difficult to obtain a pore-free ceramic with vacuum sintering because some air is always trapped in the closed micro-cavities formed by the tightly contacted particles in the green body during the high pressure formation process.…”