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Elasticity measurement of silica glass under gas pressure

¹ Department of Earth Sciences, Ehime University, Matsuyama, 790-8577 Japan
² Department of Materials Science and Engineering, Ehime University, Matsuyama, 790-8577 Japan
³ Department of Mechanical Engineering, Ehime University, Matsuyama, 790-8577 Japan
⁴ Department of Earth Sciences, Okayama University, Okayama, 700-8530 Japan

Correspondence: ^* E-mail: ohno{at}dpc.ehime-u.ac.jp

The purpose of this paper is to demonstrate that resonant ultrasound spectroscopy (RUS) is applicable to conditions of gas pressure. A sphere of silica glass was measured under pressure of helium gas with a sample-gas-cavity container assembly. The pressure-induced shifts of frequency of six toroidal and two spheroidal modes were observed up to 200 MPa (2 kbar). The sample-gas-container system was analyzed as a three-layered shell structure, and the pressure derivatives of rigidity and bulk moduli; G₀^' = –3.5 and K_S0^' = –6.0, respectively, were obtained. These results are in good agreement with previous data.

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