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 °C, 700 °C, 800 °C and 900 °C, 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.
Csaba Balázsi, Mónika Furkó, Fruzsina Szira and Katalin Balázsi
Aluminium oxynitride (AlON) has a unique thermal and chemical stability that makes it the perfect candidate for a wide range of applications. This article provides a brief description and comparison of the most common AlON preparation methods along with their advantages and disadvantages. Although there has been extensive research on the material, especially more recently because of increased commercial interest, extensive systematic powder synthesis and processing studies have not been carried out to determine alternate, more cost efficient routes to fully dense transparent bodies. Further optimization of reaction sintering and transient liquid phase sintering could be important processing routes.
In the present work we present preliminary research on producing of transparent polycrystalline ceramics. Samarium doped Yttrium oxide (1%, 3% and 5%) and Neodymium (1%) doped YAG (Y3Al5O12) translucent ceramics were fabricated by solid-state reaction. Commercial nanopowders was used as the starting materials: Sm2O3 (6μm) and Y2O2 (20-50 nm) for Sm3+: Y2O3 and α-Al2O3, Y2O3 and Nd2O3 (20-50 nm) for Nd3+: YAG. For the preparation of Nd3+: YAG, 0.5 wt% tetraethyl orthosilicate (TEOS) was use as sintering additive, and 1 wt % PEG (polyethylene glycol-400) as dispersant.
L. Grigorjeva, D. Jankoviča, K. Smits, D. Millers and S. Zazubovich
Ikesue, A., Yan Lin Aung, Yoda, T., Nakayama, S., & Kamimura, T. (2007). Fabrication and laser performance of polycrystal and single crystal Nd:YAG by advanced ceramic processing. Opt. Mat., 29 (10), 1289-1294.
Pankratov, V., Shirmane, L., Chudoba, T., Gluchowski, P., Hreniak, D., Strek, W., & Lojkowski, W. (2010). Peculiarities of luminescent properties of cerium doped YAG transparentceramics. Rad. Measur., 45 , 392-394.
Pujats, A., & Springis, M. (2001). The F
F. Muktepavela, J. Maniks, L. Grigorjeva, R. Zabels, P. Rodnyi and E. Gorokhova
., & Broqvist, P. (2014). Large-scale SCC-DFTB calculations of reconstructed polar ZnO surfaces. Surf. Sci. 628, 50–61.
8. Wilkinson, J., Ucer, K.B., & Williams, R.T. (2005). The oscillator strength of extended exciton states and possibility for very fast scintillators. Nucl. Instr. and Methods. Phys. Res. A. 537 , 66–70.
9. Rodnyi, P. A., Chernenko, K. A., Gorokhova, E. I., Kozlovskii, S.S., Khanin, V.M., & Khodyuk, I.V. (2012). Novel scintillation material – ZnO transparentceramics. IEEE Trans. Nucl. Sci. 59(5) , 2152–2155.
10. Kelly, J. P., & Graeve
Manuela-Maria Manziuc, Cristina Gasparik, Marius Negucioiu, Mariana Constantiniuc, Alexandru Burde, Ioana Vlas and Diana Dudea
DW, Gu F, Tang DN, Dong ZL, et al. Transparentceramics: processing materials and applications. Prog Solid State Chem 2013; 41: 20-54. 10.1016/j.progsolidstchem.2012.12.002
Wang SF Zhang J Luo DW Gu F Tang DN Dong ZL et al Transparentceramics: processing materials and applications Prog Solid State Chem 2013 41 20 54
50 Krell A, Hutzler T, Klimke J. Transparentceramics: transmission physics and consequences for materials selection, manufacturing and applications. J Eur Ceram Soc 2009; 29: 207-21. 10.1016/j.jeurceramsoc.2008