The pulsed cathodoluminescence of the initial material and products of synthesis of the laser nanoceramic (Y₂O₃: Nd and YAG: Nd) was investigated. The technology of synthesis was as follows. The initial coarse powder of both oxide and garnet had the average particle size 100 mm and purity 99.99 %. It was pressed into the pellets-targets and annealed at 1200^oC. The nanopowder with the particle size about 20 nm was obtained by laser evaporation of the targets. The nanopowders were calcinated at 900^oC. The nanoceramics were received by the magnetic – pulsed compaction of nanopowders with the further sintering at temperature up to 1700^oC. The luminescence of the initial material and products was investigated in the visible spectral region (350-750 nm) with the help of the setup CLAVI [1]. The irradiation by the electron beam of the powders and pellets took place at the room temperature in air. The duration of the e-beam was 1.5 ns. The exposure dose for one pulse was about 1 kGy.

In the spectrum of the initial powder Y₂O₃ the distinct impurity bands of the uncontrolled rare-earth ions with the quantity less than 10-2 atomic percent were found. In the pellets prepared for the laser evaporation from the powder mixture of Y₂O₃ with Nd₂O₃ content 1% mol. and 3.6 % mol, the amplification of the impurity bands was observed. The band broadening of ions Nd³⁺ is dominated in the both nanopowders and nanoceramics.

The pulsed cathodoluminescence method was shown to be an effective one to control the change of the properties of the materials at all the stage of the synthesis.

Reference

1. Michailov S.G., Osipov V.V., Solomonov V.I. // Pribory i Technika experimenta (Russia), # 3, p. 164-165 (2001).

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1. Investigation of luminescece of Nd: Y₂O₃ ceramics
2. The luminiscent response on the structure imperfection of Nd: YAG crystals, nanopowders and nanoceramics