The series of MgAl2O4 ceramics doped with high level of europium oxide (Eu2O3) up to 15 wt.% was fabricated by the Spark Plasma Sintering technique. The prepared ceramics have been tested using the various experimental techniques: X-ray diffraction, scanning electron microscopy, as well as optical and cathodoluminescence spectroscopy. The influence of europium oxide on the complex of optical and luminescent characteristics of MgAl2O4:Eu ceramics is discussed. The nature of the luminescence centers and the luminescence decay parameters are considered in detail.
Yttrium aluminum garnet (YAG) ceramics doped with Ce3+ was prepared by dry compaction using the common uniaxial pressing under powerful ultrasound assistance (PUA). The structure and luminescent properties of sintered ceramics were investigated. It was demonstrated that the powerful ultrasonic assistant during the dry pressing has a positive effect on the structural and luminescent characteristics of YAG: Ce3+ ceramics. The sintered material consolidation is very intensive accompanied by a decrease in the number of pores and grain growth at a sintering temperature of 1650 ºC. The luminous efficiency of YAG:Ce3+ ceramics vary from 120 to 219 lm/W (without ultrasound treatment) and from 120 to 250 lm/W (prepared with ultrasound conditions) closely related with the phase purity and implicitly with sintering temperature. It was demonstrated the positive effect of PUA on the thermal properties of ceramics.
Transparent ceramics with submicron grain sizes based on cubic yttrium-stabilized ZrO2 were obtained by the method of spark plasma sintering in the range of 1200– 1400 oC with a relatively low prepressing pressure (100 MPa). Ceramic samples showed high light transmission in the visible and near infrared regions of the spectrum. The elastoplastic properties and microstructure of ceramics are presented, the interrelation of optical and elastoplastic characteristics, as well as the microstructure are discussed. Ill. 5. Ref. 17. Tab. 2.
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