Autor: Jeong, Young-Keun - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Synthesis of Y2O3-Dispersed W Powders Prepared by Ultrasonic Spray Pyrolysis and Polymer Solution Route
Autorzy:: Jo, Hyeonhui
Lee, Young-In
Suk, Myung-Jin
Jeong, Young-Keun
Oh, Sung-Tag
Powiązania:: https://bibliotekanauki.pl/articles/2049335.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: tungsten
Y2O3 dispersion
ultrasonic spray pyrolysis
wet chemical route
Opis:: The nano-sized Y2O3 dispersed W composite powder is prepared by ultrasonic spray pyrolysis of a tungsten precursor using ammonium metatungstate hydrate and a polymer addition solution method using Y-nitrate. XRD analysis for calcined powder showed the formation of WO2 phase by partial oxidation of W powder during calcination in air. The TEM and phase analysis for further hydrogen reduction of calcined powder mixture exhibited that the W powder with a uniform distribution of Y2O3 nanoparticles can be successfully produced. These results indicate that the wet chemical method combined with spray pyrolysis and polymer solution is a promising way to synthesis the W-based composites with homogeneous dispersion of fine oxide particles.
Źródło:: Archives of Metallurgy and Materials; 2021, 66, 3; 799-802
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Synthesis and Characterization of W Composite Powder with La2O3-Y2O3 Nano-Dispersoids by Ultrasonic Spray Pyrolysis
Autorzy:: Heo, Youn Ji
Lee, Eui Seon
Kim, Jeong Hyun
Lee, Young-In
Jeong, Young-Keun
Oh, Sung-Tag
Powiązania:: https://bibliotekanauki.pl/articles/2174558.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: W composite powder
La2O3-Y2O3 dispersion
ultrasonic spray pyrolysis
polymeric additive solution method
Opis:: An optimum route to synthesis the W-based composite powders with homogeneous dispersion of oxide nanoparticles was investigated. The La2O3 dispersed W powder was synthesized by ultrasonic spray pyrolysis using ammonium metatungstate hydrate and lanthanum nitrate. The dispersion of Y2O3 nanoparticles in W-La2O3 powder was carried out by a polymer addition solution method using yttrium nitrate. XPS and Tem analyses for the composite powder showed that the nano-sized La2O3 and Y2O3 particles were well distributed in W powder. This study suggests that the combination processing of ultrasonic spray pyrolysis and polymeric additive solution is a promising way to synthesis W-based composite powders.
Źródło:: Archives of Metallurgy and Materials; 2022, 67, 4; 1507--1510
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Stability of Garnet-Type Li7La3Zr2O12-Based Ceramics for All-Solid-State Batteries
Autorzy:: Yi, Eun-Jeong
Yoon, Keun-Young
Jung, Hyun-Ah
Hwang, Haejin
Powiązania:: https://bibliotekanauki.pl/articles/355988.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: all-solid-state batteries
solid electrolytes
garnet type ceramics
ionic conductivity
Opis:: Al and Nb-doped Li₇ La₃ Zr₂O₁₂ (LLZO) and W-doped LLZO lithium ion conducting electrolyte samples were prepared and their H₂O stability was investigated. The LLZO samples were exposed to 50% humidified air for 48 h. After H₂O exposure, a cubic to tetragonal transformation occurred and acquired SEM images exhibited the presence of reaction phases at the grain boundaries of Al and Nb-LLZO. As a result, the lithium ion conductivity significantly decreased after H₂O exposure. On the contrary, W-LLZO showed good stability against H₂O. Although the cubic to tetragonal transformation was also observed in H₂O-exposed W-LLZO, the decrease in lithium ion conductivity was found to be modest. No morphological changes of the W-LLZO samples were confirmed in the H₂O-exposed W-LLZO samples.
Źródło:: Archives of Metallurgy and Materials; 2019, 64, 2; 579-583
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

Artykuł

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