Phase Relations and Volume Changes of Hafnia under High Pressure and High Temperature

Using multi‐anvil high‐pressure devices and synchrotron radiation, X‐ray in situ observations of HfO2 under high pressure and high temperature have been performed to investigate its phase relations and compression behavior. An orthorhombic phase (orthoI) is stable from 4 to 14.5 GPa below 1250°–1400...

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Veröffentlicht in:Journal of the American Ceramic Society 2001-06, Vol.84 (6), p.1369-1373
Hauptverfasser: Ohtaka, Osamu, Fukui, Hiroshi, Kunisada, Taichi, Fujisawa, Tomoyuki, Funakoshi, Kenichi, Utsumi, Wataru, Irifune, Tetsuo, Kuroda, Koji, Kikegawa, Takumi
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container_end_page 1373
container_issue 6
container_start_page 1369
container_title Journal of the American Ceramic Society
container_volume 84
creator Ohtaka, Osamu
Fukui, Hiroshi
Kunisada, Taichi
Fujisawa, Tomoyuki
Funakoshi, Kenichi
Utsumi, Wataru
Irifune, Tetsuo
Kuroda, Koji
Kikegawa, Takumi
description Using multi‐anvil high‐pressure devices and synchrotron radiation, X‐ray in situ observations of HfO2 under high pressure and high temperature have been performed to investigate its phase relations and compression behavior. An orthorhombic phase (orthoI) is stable from 4 to 14.5 GPa below 1250°–1400°C and transforms to a tetragonal phase, which is one of the high‐temperature forms of HfO2, above these temperatures. Another orthorhombic phase (orthoII) with a cotunnite‐type structure appears above 14.5 GPa. OrthoII is stable up to 1800°C at 21 GPa. OrthoII is quenchable to ambient conditions. The orthoI‐to‐orthoII transition is accompanied by ∼8 vol% decrease. The bulk moduli of orthoI and orthoII at room temperature are 220 and 312 GPa, respectively. This low compressibility of orthoII indicates that it is a potential candidate for very hard materials.
doi_str_mv 10.1111/j.1151-2916.2001.tb00843.x
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source Wiley Online Library Journals Frontfile Complete
subjects Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
hafnium/hafnium compounds
Miscellaneous
phases
Technical ceramics
title Phase Relations and Volume Changes of Hafnia under High Pressure and High Temperature
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