@article{f173814ff82247d099bdf451d11efdcb,
title = "Transparent nanocrystalline bulk alumina obtained at 7.7 GPa and 800 ° C",
abstract = "Transparent nanocrystalline bulk alumina was obtained at 7.7 GPa and 800 C. The alumina has an average grain size of ∼150 nm and an in-line transmission of 71% for a wavelength of 640 nm and a thickness of 0.8 mm. The values of microhardness and fracture toughness were found to be 25.5 ± 0.3 GPa and 2.9 ± 0.3 MPa m1/2, respectively. The hardness value is consistent with the previously determined Hall-Petch relation and fracture toughness is independent of grain size.",
keywords = "Alumina, Hardness, High pressure, Nanocrystalline, Transparent",
author = "Norimasa Nishiyama and Takashi Taniguchi and Hiroaki Ohfuji and Kimiko Yoshida and Fumihiro Wakai and Kim, {Byung Nam} and Hidehiro Yoshida and Yuji Higo and Astrid Holzheid and Oliver Beermann and Tetsuo Irifune and Yoshio Sakka and Funakoshi, {Ken Ichi}",
note = "Funding Information: We thank M. Miyakawa, F. Kawamura, T. Ikeda, K. Fujimaki and B. Ledwig for technical assistance. We also thank Y. Shinoda, H. Hosono, M. Yuki and H.P. Liemann for discussion. This research was supported by JST , PRESTO , New Materials Science and Element Strategy granted to N.N. ",
year = "2013",
month = sep,
doi = "10.1016/j.scriptamat.2013.05.017",
language = "English",
volume = "69",
pages = "362--365",
journal = "Scripta Materialia",
issn = "1359-6462",
publisher = "Elsevier Ltd.",
number = "5",
}