Impact of Surface Roughness on Recrystallization of an α-Al2O3(001) Single Crystal to α-AlO(OH) Diaspore Microcrystals | Zendy

Yuki Sasahara | Zendy; Koki Kanatani | Zendy; Masayuki Matsuhisa | Zendy; Yuji Wada | Zendy; Ryota Shimizu | Zendy; Norimasa Nishiyama | Zendy; Taro Hitosugi | Zendy

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Impact of Surface Roughness on Recrystallization of an α-Al2O3(001) Single Crystal to α-AlO(OH) Diaspore Microcrystals

Author(s) -

Yuki Sasahara,

Koki Kanatani,

Masayuki Matsuhisa,

Yuji Wada,

Ryota Shimizu,

Norimasa Nishiyama,

Taro Hitosugi

Publication year - 2020

Publication title -

acs omega

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.779

H-Index - 40

ISSN - 2470-1343

DOI - 10.1021/acsomega.0c01376

Subject(s) - recrystallization (geology) , surface roughness , crystallite , materials science , surface finish , crystal (programming language) , mineralogy , crystallography , composite material , metallurgy , geology , chemistry , petrology , computer science , programming language

We demonstrate that the surface of an α-Al 2 O 3 (001) single crystal recrystallizes to α-AlO(OH) under ultrahigh pressure (8 GPa) at 600 °C. The recrystallization depends on the degree of surface roughness. A polished surface topotaxially recrystallizes to (100)-oriented α-AlO(OH) microcrystals, while unpolished surface recrystallizes to polycrystalline α-AlO(OH). This study demonstrates a new synthetic route to obtain oriented crystals of ultrahigh-pressure-phase materials and paves the way for the investigations of the physical and chemical properties of such materials.

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