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Equation of state and structural phase transition in FeBO3 at high pressure |
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| Authors: | A. G. Gavriliuk I. A. Trojan R. Boehler M. Eremets A. Zerr I. S. Lyubutin V. A. Sarkisyan |
| Affiliation: | 1. Institute of High-Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow oblast, 142092, Russia 2. Max-Planck Institut für Chemie, 55020, Mainz, Germany 3. Technische Universit?t Darmstadt, FB Material-und Geowissenschaften, FG Disperse Feststoffe, 64287, Darmstadt, Germany 4. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 117333, Russia |
| Abstract: | The evolution of X-ray diffraction patterns in FeBO3 under high pressures up to 63 GPa has been investigated at room temperature in a diamond anvil cell. A structural phase transition at a pressure of 53±2 GPa was found for the first time. The transition is of the first-order type with a hysteresisless drop of the reduced unit cell volume of about 8.6%. Apparently, the transition is isostructural. At pressures below the transition, the equation of state for FeBO3 was fitted. In the third-order approximation of the Birch-Murnagan equation of state, the bulk modulus K and its first pressure derivative K′ were found to be 255±25 GPa and 5.0±1.2, respectively. |
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