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VOLUME 75 (2002) | ISSUE 1 | PAGE 25
Equation of state and structural phase transition in FeBO3 at high pressure
PACS: 61.50.Ks, 64.60.-i, 64.70.Kb
Abstract
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 pressure of 53\pm2 GPa was found for the first time. The transition is of the first- order type with the 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 approximation of the third order Birch-Murnagan equation of state, the bulk modulus K and its first pressure derivative K' were found to be 255 \pm25 GPa and 5.0 \pm 1.2, respectively.