Transparent ceramics prepared from ultrapure magnesium aluminate spinel nanopowders by spark plasma sintering

Synthesis, structure and spectroscopy of Fe2+:MgAl2O4 transparent ceramics and glass-ceramics

“…For the consolidation of optical-quality spinel ceramics, either hot pressing with a fluoride-based sintering additive [36] or free sintering with a subsequent hot isostatic pressing (HIP) treatment is used [37]. Less frequent methods are spark plasma sintering (SPS) [38] and microwave sintering [39]. These methods allow to achieve high compaction rates and to preserve the sub-μm structure of ceramics which is responsible for their high micro-hardness.…”

Thermo-Optical Studies of Laser Ceramics

“…The ceramics of magnesium aluminate (MgAl 2 O 4 ) and zinc aluminate (ZnAl 2 O 4 ) spinels are of the greatest interest for laser applications. They have high thermal conductivity (about 18 W/m/K at 300 K [ 67 ]), microhardness ( H V about 16 [ 68 ], and 11 GPa [ 69 ], respectively), a wide range of transparency (0.2–6 and 0.3–7 μm, respectively), radiation resistance, and an isotropic structure.…”

“…An approach to the synthesis of stoichiometric MgAl 2 O 4 nanopowders by means of hydrolysis of double magnesium-alumininate isopropoxide MgAl 2 (OPr i ) 8 with subsequent annealing of the formed hydroxides in air at a temperature of 700–900 °C was proposed in [ 68 , 70 ]. Double magnesium-aluminate isopropoxide has a relatively high volatility, and a particularly pure precursor of spinel nanopowders can be obtained from raw materials of technical qualification by the method of single vacuum distillation [ 71 ].…”