Registration Number
0224U032085,
(0124U003283)
, R & D reports
Title
Laser Ceramics for Detector of Harmful Substances
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Лазерна кераміка для детекторів шкідливих речовин
Head
Ragulia Andrii V., д.т.н.
Registration Date
24-07-2024
Organization
Frantsevich Institute for Problems of Materials Science National Academy of Science of Ukraine
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Development of a technique for the synthesis and sintering of nanopowders based on an ordered phase of the perovskite type LaLuO3:Ln3+
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As a result of the work carried out, a technique for the synthesis of nanopowder based on an ordered phase with a perovskite-type structure doped with Yb3+ ions was developed. According to the data of IR spectroscopy, the formation of peaks with frequencies ~ 468 and 501 cm-1 was established, which indicate the crystallization process of the ordered structure of the LaLuO3:Yb3+ perovskite type. The resulting nanopowder is characterized by a particle size of 41 to 60 nm. As a result of the sintering of the obtained nanopowder, by the SPS method, a dense, practically non-porous ceramic material is formed.
It was established that when using the SPS method, sintering of nanopowders should be carried out at temperatures below 1500 C in order to prevent polymorphic transformation of the ordered perovskite-type structure.
Using the EPR spectroscopy method, it was established that Yb3+ has the electronic configuration of the outer shell 4f13, that is, a hole in the f-shell corresponding to the electron spin of this ion S=1/2. Its EPR spectrum occurs below about 75 K. The spectrum is broad but has clear peaks associated with three g-factors and three components of the electron-nuclear hyperfine (HF) interaction.
It was established that upon excitation in the region of interband transitions, the emission intensity in the sintered LaLuO3:Yb ceramic sample and LaLuO3:4%Yb, LaLuO3:1%Yb nanopowders are consistent. However, at low-energy excitation (about 3.5 eV in the powders and about 4.1-4.3 eV, 3.6 eV in the sintered sample), the emission intensity of the powders is much higher compared to the sintered ceramic sample.
Product Description
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Zamula Maryna V.
Korniienko Oksana A.
Rahulia Andrii V.
Tomila Tamara V.
Shyrokov Oleksandr V.
Yurchenko Yurii V.
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2024-07-24
