Synthesis of yttrium aluminum garnet (YAG) powder by homogeneous precipitation combined with supercritical carbon dioxide or ethanol fluid drying

Characterization of cerate–zirconate ceramic powder prepared by a high-pressure–high-temperature batch-wise reactor system

“…The TG-DTG thermograms of the dried powder (T = 250 [10] also suggested that the volatilization of excess ethanol can be seen at the same range as being observed in this work.…”

“…• Vapourization of organic complexes obtained from polymerized complex reaction of metal nitrate [10]. Step C:…”

Spark and plasma in spark plasma sintering of rigid ceramic nanoparticles: A model system of YAG

“…Following the DSC results, the shrinkage at ∼950 • C can be related to crystallization/nucleation of the cubic YAG phase. [18][19][20] This temperature is a little higher than measured in the DSC (895 • C); however, the temperatures during the SPS process are measured at the graphite die, and may be higher by several degrees from the temperature inside the non-conductive compact. Therefore, a possible scenario for the shrinkage start may be as the following: The particles pack at the beginning of the process by rearrangement due to the applied pressure, and get jammed due to frictional forces between them.…”

“…DSC of the AR powder (not shown here) revealed exothermic peaks at 894 • C, 1087 • C and 1241 • C. The first peak at 894 • C corresponds to the crystallization of cubic YAG 18,19 while the second peak at 1087 • C is related to phase transformation of YAP into YAG. 19,20 The peak at 1241 • C was also reported by heating of pure YAG but its origin is unknown. 21 The density and temperature changes during the SPS heating of the AR powder to 1400 • C at 2 and 100 MPa pressures were shown in Fig.…”

Controllable Fabrication and Optical Properties of Uniform Gadolinium Oxysulfate Hollow Spheres

“…As shown in the Figure 2A, the FT-IR spectra reveal the existence of absorbed water, crystal water, hydroxyl groups (~3410 cm −1 and 1640 cm −1 ), carbonates anions (~1580 cm −1 and 1415 cm −1 ) and sulfates anions (~680 cm −1 ) in the Gd-organic precursors37. The weak peaks at 2965 cm −1 and 2927 cm −1 are assigned to the -C-H vibration mode of -CH 2 38. As the temperature of calcination increasing to 200 °C and 400 °C, the broaden band at 3410 cm −1 becomes weaker and weaker while the small peak at 1640 cm −1 disappears at 400 °C, which can be attributed to the removal of absorbed water and crystal water from the Gd-organic precursors.…”