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Fabrication of highly-transparent Er:CaF2 ceramics by hot-pressing technique

Zhou W. B., Cai F F, Zhi G L, Mei B C

Materials Science Poland

2014

Vol. 32, No. 3

358--363

Highly-transparent trivalent erbium ion doped calcium fluoride (5 mol % Er:CaF2) ceramics were fabricated by a hotpressing (HP) method using high-purity Er:CaF2 nanoparticles, which were synthesized by co-precipitation method. The mean grain size of the nanoparticles was about 24.7 nm. The nanoparticles were sintered at 600 respectively, for 30 min under a uniaxial pressure of 30 MPa and vacuum of 10-3 Pa with 1 mol % lithium fluoride (LiF) as sintering additive. The 5 mol % Er:CaF2 ceramics sintered at 800 C exhibits high density and pore-free microstructure with an average grain size of about 8 μm. The optical transmittance of the transparent ceramics is close to 85 % at visible and nearinfrared wavelengths. The strong and broad absorptions peaks corresponding to characteristic absorption of trivalent erbium ions make the ceramics a potential candidate for infrared and upconversion laser operating.

On the synthesis and properties of bulk ternary Cr2AlC ceramics

Zhou W. B., Mei B. C., Zhu J. Q.

Materials Science Poland

2009

Vol. 27, No. 4/1

974--980

Dense bulk Cr2AlC was synthesized by hot-pressing of Cr, Cr3C2 and Al powders as starting materials.The phase composition was determined by X-ray diffraction (XRD), the microstructures of the samples were observed with a scanning electron microscope (SEM) and thermal, electrical as well as the mechanical properties at and above room temperature were determined. The results showed that Cr2AlC grains have columnar and plate-like shapes, and that it is a good electrical and thermal conductor.