Microstructure evolution of SiO2, ZrO2-doped Y3Al5O12:Nd3+ ceramics obtained by reactive sintering

Contamination Study of Zirconia on the Densification Process and Properties of Transparent MgAl2O4 Ceramics

“…With the increase of zirconia, the average grain size of HIPed samples A1, B1, and C1 (listed in Table 1) increased slightly. This is quite different from the Zr 4+ doped yttrium aluminum garnet (YAG) ceramic, where Zr 4+ can inhibit grain growth in YAG [28,29]. The mechanism of zirconia promoting grain growth in the spinel system needs further research.…”

Effect of Nd 3+ ions on phase transformations and microstructure of 0–4 at.% Nd 3+ :Y 3 Al 5 O 12 transparent ceramics

“…The optimal sintering temperature may be different for Nd 3+ :YAG ceramics with different doping levels [13,[16][17][45][46]. While the sintering parameters were preliminarily optimized in our previous work [12], the more fine tuning of the sintering temperature of 3-xY 2 O 3 -xNd 2 O 3 -5Al 2 O 3 (x=0.03-0.12) powder mixtures is still required.…”

“…It is widely known that the use of nanopowders within this approach leads to an increase in activity of Y 2 O 3 -Al 2 O 3 oxide system with respect to phase formation [10]. Ensuring competitive advantage of the densification processes over the grain growth at the intermediate and final sintering stages is possible by the use of additives that increase ionic diffusivity by modification of the host defect chemistry (such as MgO, ZrO 2 , La 2 O 3 [11][12][13]). Another approach is based on enhancement of diffusion via formation of transient solid or liquid phases that promote sintering (SiO 2 , LiF, SiO 2 -B 2 O 3 , and MgO-SiO 2 sintering aids [14][15][16][17][18]).…”

Single CaO accelerated densification and microstructure control of highly transparent YAG ceramic

“…The propose of the sintering additive is to promote further densification, while reducing the amount of scattering sources (e.g. voids) and limiting the grain size of ceramics during sintering, in order to improve the final optical quality of sintered ceramics . However, sintering additive as a kind of “impurity” may deteriorate the optical homogeneity of ceramic, if excessive amount of sintering additive is added .…”

“…voids) and limiting the grain size of ceramics during sintering, in order to improve the final optical quality of sintered ceramics. 18,19 However, sintering additive as a kind of "impurity" may deteriorate the optical homogeneity of ceramic, if excessive amount of sintering additive is added. 20,21 Therefore, to obtain ceramic material with excellent optical properties, a small amount of sintering additive is always pursued during ceramic processing.…”