Structural Phase Transitions and the Equation of State in SnSe at High Pressures up to 2 Mbar


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Abstract

The crystal structure of tin selenide SnSe has been studied under quasihydrostatic compression at pressures up to 205 GPa created in diamond anvil cells at room temperature. Two structural phase transitions have been detected at and P ≈ 2.5 32 GPa. The former phase transition is continuous from the GeS-type structure (space group Pbnm) to the TlI-type structure (space group Cmcm). The phase transition to the CsCl-type cubic structure (space group Pm\(\bar 3\)m) occurs at 32 GPa and is accompanied by a stepwise decrease in the volume of the unit cell by 7%. The pressure dependence of the specific volume of the unit cell at room temperature has been constructed up to 205 GPa.

About the authors

A. G. Ivanova

Shubnikov Institute of Crystallography, Federal Research Center Crystallography and Photonics; Institute for Nuclear Research

Email: lyubutinig@mail.ru
Russian Federation, Moscow, 119333; Moscow, 117312

I. A. Troyan

Shubnikov Institute of Crystallography, Federal Research Center Crystallography and Photonics; Institute for Nuclear Research

Email: lyubutinig@mail.ru
Russian Federation, Moscow, 119333; Moscow, 117312

D. A. Chareev

Institute of Experimental Mineralogy; Institute of Physics and Technology; Kazan Federal University

Email: lyubutinig@mail.ru
Russian Federation, Chernogolovka, Moscow region, 142432; Yekaterinburg, 620002; Kazan, 420008

A. G. Gavriliuk

Shubnikov Institute of Crystallography, Federal Research Center Crystallography and Photonics; Institute for Nuclear Research; Immanuel Kant Baltic Federal University

Email: lyubutinig@mail.ru
Russian Federation, Moscow, 119333; Moscow, 117312; Kaliningrad, 236041

S. S. Starchikov

Shubnikov Institute of Crystallography, Federal Research Center Crystallography and Photonics; Institute for Nuclear Research

Email: lyubutinig@mail.ru
Russian Federation, Moscow, 119333; Moscow, 117312

A. O. Baskakov

Shubnikov Institute of Crystallography, Federal Research Center Crystallography and Photonics

Email: lyubutinig@mail.ru
Russian Federation, Moscow, 119333

K. V. Frolov

Shubnikov Institute of Crystallography, Federal Research Center Crystallography and Photonics

Email: lyubutinig@mail.ru
Russian Federation, Moscow, 119333

M. Mezouar

European Synchrotron Radiation Facility, CS40220

Email: lyubutinig@mail.ru
France, Grenoble Cedex 9, F-38043

I. S. Lyubutin

Shubnikov Institute of Crystallography, Federal Research Center Crystallography and Photonics

Author for correspondence.
Email: lyubutinig@mail.ru
Russian Federation, Moscow, 119333

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