Determination of the phase boundary of the ferroelastic rutile to CaCl${}_{2}$ transition in RuO${}_{2}$ using in situ high-pressure and high-temperature Raman spectroscopy

Determination of the phase boundary of the ferroelastic rutile to CaCl $_{2}$ transition in RuO $_{2}$ using in situ high-pressure and high-temperature Raman spectroscopy

Shigeaki Ono and Kenji Mibe

Phys. Rev. B 84, 054114 – Published 15 August 2011

Abstract

The high-pressure behavior of RuO $_{2}$ has been examined using Raman-scattering spectroscopy to a pressure of 31 GPa and a temperature of 1000 K employing a hydrothermal diamond anvil cell (HTDAC) technique. The ferroelastic transition from the rutile- to the CaCl $_{2}$ -type structure was confirmed. A split of the E $_{g}$ mode in the rutile-type structure to the B $_{2 g}$ and B $_{3 g}$ modes in the CaCl $_{2}$ -type structure was observed at the transition pressure. A change in the pressure dependence of each Raman mode between the rutile- and the CaCl $_{2}$ -type structure was confirmed. The transition has a positive dP $/$ dT gradient, which is consistent with those reported in other AO $_{2}$ studies. The transition boundary was determined to be P (GPa) $=$ 5.9 $+$ 0.0056 × T (K).

Received 26 April 2011

DOI:https://doi.org/10.1103/PhysRevB.84.054114

Authors & Affiliations

Shigeaki Ono^1,2,* and Kenji Mibe²

¹Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka-shi, Kanagawa 237-0061, Japan
²Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan

^*sono@jamstec.go.jp

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Vol. 84, Iss. 5 — 1 August 2011

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Physical Review B

covering condensed matter and materials physics