Autor: Hwang, Haejin - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Effect of Zr and Nb on the Electrical and Magnetic Properties of the Fe-Zr-Nb-B-Cu Alloy
Autorzy:: Noh, Junghyun
Park, Seungyeon
Hwang, Haejin
Lim, Kyoungmook
Powiązania:: https://bibliotekanauki.pl/articles/350932.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: soft magnetic
magnetic properties
amorphous alloy
nanocrystalline alloy
electrical properties
Opis:: The present study, aims to investigate the effect of minor Zr and Nb alloying on soft magnetic and electrical properties of Fe₈₆ (Zr_x Nb_1-x )7B₆ Cu₁ (x=1, 0.75, 0.5, 0.25) alloys. The investigated alloys were prepared through the melt spinning process. Within the examined compositional range (Nb up to 5.25 at%, respectively), the soft magnetic properties and electrical resistivity of the alloys continuously increase with increasing Nb content. However increasing the Nb content further decreases such properties. We could confirm the influence of ratio of Zr and Nb on grain growth and crystallization fraction during crystallization by using the soft magnetic properties and electrical properties.
Źródło:: Archives of Metallurgy and Materials; 2019, 64, 3; 879-882
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

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

Skocz do pozycji: 3.

Tytuł:: Fabrication of Agar-Silica Aerogel Nanocomposite Films
Autorzy:: Lee, Min-Jin
Jung, Hyun-Ah
Lee, Kyong-Jin
Hwang, Haejin
Powiązania:: https://bibliotekanauki.pl/articles/356287.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: thermal insulation film
silica aerogel
agar
thermal conductivity
transmittance
Opis:: In this study, agar-based nanocomposite films containing ultra-porous silica aerogel particles were fabricated by gel casting using an aqueous agar/silica aerogel slurry. The silica aerogel particles did not show significant agglomeration and were homogeneously distributed in the agar matrix. Transmission electron microscopy observations demonstrated that the silica aerogel particles had a mesoporous microstructure and their pores were not incorporated into the agar polymer molecules. The thermal conductivities of the agar and agar/5wt.% silica aerogel nanocomposite films were 0.36 and 0.20 W·m^-1·K^-1, respectively. The transmittance of the agar films did not decrease upon the addition of silica aerogel particles into them. This can be attributed to the anti-reflection effect of silica aerogel particles.
Źródło:: Archives of Metallurgy and Materials; 2019, 64, 3; 851-855
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

Artykuł

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