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Browsing by Author "Fedorov P."

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Bryozoan fauna from the mississippian of the akuyuk section, southern kazakhstan

Tolokonnikova Z.; Fedorov P.; Wyse Jackson P.N. (2020)

© 2020 E. Schweizerbart’sche Verlagsbuchhandlung, Stuttgart, Germany. Five bryozoan species are described from the lower part of the Akuyuk section (Late Viséan, Mississippian) in southern Kazakhstan. Thin sectioning and ...
High down-conversion in MF<inf>2</inf>:Yb:R (M = Ca, Sr; R = Pr, Ce, Eu) solid solution powder for photonics

Kuznetsov S.; Morozov O.; Gorieva V.; Mayakova M.; Proydakova V.; Marisov M.; Pavlov V.; Voronov V.; Yapryntsev A.; Ivanov V.; Nizamutdinov A.; Semashko V.; Fedorov P. (2018)

© 2018 IEEE. We synthesized MF2:Yb:R (M = Ca, Sr; R = Pr, Ce, Eu) powders by a different kind of precipitation techniques. We determined optimal compositions with a quantum efficiency of photon transfer about 190 % (quantum ...
Investigation of the mechanisms of upconversion luminescence in Ho3+ doped CaF2 crystals and ceramics upon excitation of 5I7 level

Lyapin A.; Ryabochkina P.; Chabushkin A.; Ushakov S.; Fedorov P. (2015)

© 2015 Elsevier B.V. All rights reserved. The mechanisms of upconversion luminescence of CaF2:Ho crystals and ceramics from 5F3, 5S2(5F4), 5F5 and 5I6 levels upon excitation of 5I7 level of Ho3+ ions were investigated. ...
Synthesis and down-conversion luminescence investigation of CaF<inf>2</inf>:Yb:Ce powders for photonics

Kuznetsov S.; Nizamutdinov A.; Mayakova M.; Madirov E.; Khadiev A.; Gorieva V.; Voronov V.; Yapryntsev A.; Ivanov V.; Semashko V.; Fedorov P. (2019)

© 2019 Elsevier B.V. Single-phase solid solutions based on calcium fluoride doped with ytterbium and cerium trivalent ions were synthesized by co-precipitation from aqueous solutions. According to scanning electron microscopy, ...
Synthesis and Luminescence of Sr<inf>1</inf><inf>– x – y</inf>Yb<inf>x</inf>Eu<inf>y</inf>F<inf>2</inf><inf>+ x + y</inf> Solid Solutions for Photonics

Kuznetsov S.; Nizamutdinov A.; Proydakova V.; Madirov E.; Voronov V.; Yapryntsev A.; Ivanov V.; Gorieva V.; Marisov M.; Semashko V.; Fedorov P. (2019)

© 2019, Pleiades Publishing, Ltd. Abstract—: Single-phase Sr1– x – yYbxEuyF2+ x + y solid solutions with an average particle size near 90 nm have been synthesized via co-precipitation from aqueous solutions, followed by ...
Synthesis and luminescence studies of CaF<inf>2</inf>:Yb:Pr solid solutions powders for photonics

Kuznetsov S.; Morozov O.; Gorieva V.; Mayakova M.; Marisov M.; Voronov V.; Yapryntsev A.; Ivanov V.; Nizamutdinov A.; Semashko V.; Fedorov P. (2018)

© 2018 Elsevier B.V. Praseodymium- and ytterbium-doped calcium fluoride powder samples were prepared by co-precipitation from aqueous solutions followed by annealing at 600 °C. Phase and microstructure analyses of these ...
Thermal conductivity of crystals formed by fluoritelike phases in MF-RF3 systems (M = Li, Na, and K, R = Rare Earth)

Popov P.; Fedorov P.; Semashko V.; Korableva S.; Marisov M.; Gordeev E.; Reiterov V.; Osiko V. (2009)

The temperature dependence of the thermal conductivity for laser media based on fluoride crystals was determined and its relationship with the degree of ordering in the crystal structure of these materials was found. All ...
Upconversion luminescence of Ca<inf>1-x</inf>Ho<inf>x</inf>F<inf>2+x</inf>and Sr<inf>0.98-x</inf>Er<inf>0.02</inf>Ho<inf>x</inf>F<inf>2.02+x</inf>powders upon excitation by an infrared laser

Lyapin A.; Kuznetsov S.; Ryabochkina P.; Merculov A.; Chernov M.; Ermakova Y.; Luginina A.; Fedorov P. (2017)

© 2017 Astro Ltd. Fluorite-type Ca 1-x Ho x F 2+x and Sr 0.98-x Er 0.02 Ho x F 2.02+x powders were synthesized using the co-precipitation from water solution technique. The upconversion luminescence of Ca 1-x Ho x F 2+x ...

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Browsing by Author "Fedorov P."

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