Transparent yttrium aluminum garnet (YAG) ceramics by spark plasma sintering

Effect of sintering temperature on optical properties and microstructure of translucent zirconia prepared by high-pressure spark plasma sintering

“…Usually the pore scattering significantly affects the transparency of ceramics [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. However, annealing experiments on SPS samples indicate only a weak effect of residual pores on transparency [10][11][12].…”

“…To restrain grain growth, spark plasma sintering (SPS) is used as an alternative method to prepare transparent c-YSZ [9][10][11][12], as well as other transparent ceramics, such as Al 2 O 3 [13][14][15][16][17][18][19][20][21][22], MgAl 2 O 4 [23][24][25][26][27], Y 3 Al 5 O 12 [27][28][29], MgO [30] and 3Al 2 O 3 · 2SiO 2 [31,32]. Garay and co-workers [9,10] reported that nanograined transparent c-YSZ could be produced by SPS at a moderate pressure of 141 MPa.…”

Field‐Assisted Sintering Technology/Spark Plasma Sintering: Mechanisms, Materials, and Technology Developments

“…Transparent ceramics synthesized by FAST/SPS include a large number of optically isotropic materials [132] like yttrium-aluminum-garnet (YAG), pure or doped with rare earths, [133][134][135][136] yttria, [137] magnesia, [138] magnesium aluminum spinel, [139,140] fully stabilized zirconia, [141] and lutetium based oxides. [142] Optically anisotropic ceramics are even more challenging, as the transparency decreases drastically as grain size increases, and alumina, [143][144][145][146] tetragonal zirconia, [147] or hydroxyapatite [148] have been synthesized with improving success.…”

Monolithic translucent BaMgAl10O17:Eu2+ phosphors for laser-driven solid state lighting

“…18 In cubic systems, such as the canonical yellow phosphor Ce-doped yttrium aluminum garnet, light scattering is dominated by pores, and the reduction of pores by optimizing SPS parameters and utilizing nanoparticulate starting materials results in transparent samples. [19][20][21] In hexagonal systems, such as BAM:Eu 2+ , the refractive index is anisotropic and therefore depends on orientation of the grains. This anisotropy leads to additional grain scattering versus cubic crystals, making hexagonal systems, such as α-Al 2 O 3 , translucent at best and not transparent.…”