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Dr. Jens Klimke
Fraunhofer Institute for Ceramic Technologies and Systems (IKTS), Germany
Transparent oxide ceramics with specific absorption
refractive index lenses, optoelectronic devices, lasers, optical filters andinfrared windows can be developed with ceramics.
The transmission of dense sinteredceramics is limited by absorption and by scattering.Pores or defects and components with different index of refraction are the major factors of scattering of light in ceramics [1].Based on simulations using Mie scattering theory the influence of scattering is discussed as a function of pore size and index of refraction. Scattering can be minimized by defect avoiding liquid shaping methods like gel casting [2].

Our approach follows the adjustment of the spectral transmission by specific dopants. The effect of cobalt- and chromium on the transmissionof different types of transparent oxide ceramics: Al2O3, MgAl2O4 and cubic ZrO2 were compared. The specific absorption allows conclusions about theposition of the dopant and the microstructure of the ceramics.

[1] Krell, A.; Hutzler, T.; Klimke, J.: Transmission physics and consequences for materials selection, manufacturing, and applications, Journal of the European Ceramic Society 29 (2009)2, 207-221
[2] Krell, A.; Klimke, J.: Effect of the Homogeneity of Particle Coordination on Solid-State Sintering of Transparent Alumina, Journal American Ceramic Society 89 (2006) 6, 1985-1992
Dr. Jens Klimkeis currently senior researcher at Fraunhofer Institute for Ceramic Technologies and Systems (IKTS) in Dresden, Germany. He earned his diploma in Chemistry (1993) and PhD in physical chemistry (1998) at University of Greifswald in Germany. Between 1996 and 2000 he was Lab manager at LITEC-LLL, responsible for the development and testing of new inorganic phosphors, coatings and fluorescent lamps. In year 2000 he joint IKTS for the research of the new generation of transparent corundum with submicron grain size. Since 15 years Dr. Klimke carried out pioneering work in the field of transparent ceramics based on oxide materials for optical and mechanical applications. His major interests are defect avoiding shaping technologies for ceramics including the preparation of nano-powders, stabilization of ceramic suspensions and new sintering techniques for ceramics. Dr. Klimke has authored and co-authored numerous international publications and holds 6 patents.
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