Journal
OPTICAL MATERIALS
Volume 90, Issue -, Pages 26-32Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2019.02.009
Keywords
Magneto-optical material; TGG ceramic; Co-precipitation method; Calcination temperature
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Funding
- National Key R&D Program of China [2017YFB0310500]
- National Natural Science Foundation of China [61575212]
- key research project of the frontier science of the Chinese Academy of Sciences [QYZDB-SSW-JSC022]
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Terbium gallium garnet (TGG) ceramics were fabricated by air sintering and successive HIP post-treating from the TGG nanoparticles synthesized via the co-precipitation technique. The influences of the calcination temperature on the phase and morphology evolution of the nano-powders, as well as the optical transparency and microstructure of the obtained TGG ceramics were investigated in detail. The powders calcined at 1100-1250 degrees C retained the TGG phase purity and displayed significantly less agglomeration. Using the above powders as raw materials, the TGG ceramics pre-sintered at 1500 degrees C for 3 h in air and then HIP post-treated at 1550 degrees C for 3 h under 150 MPa argon gas showed the similar optical qualities and the in-line transmittances were about 70% at 1064 nm. The Verdet constants of all the ceramics were calculated to be about 137 rad T-1 m(-1) at room temperature, which were nearly independent of the optical quality of the ceramics.
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