Abstract
The optical properties and structure of gadolinium iron borate GdFe3(BO3)4 crystals are studied at high pressures produced in diamond-anvil cells. X-ray diffraction data obtained at a pressure of 25.6 GPa reveal a firstorder phase transition retaining the trigonal symmetry and increasing the unit cell volume by 8%. The equation of state is obtained and the compressibility of the crystal is estimated before and after the phase transition. The optical spectra reveal two electronic transitions at pressures ∼26 GPa and ∼43 GPa. Upon the first transition, the optical gap decreases jumpwise from 3.1 to ∼2.25 eV. Upon the second transition at P=43 GPa, the optical gap deceases down to ∼0.7 eV, demonstrating a dielectric-semiconductor transition. By using the theoretical model developed for a FeBO3 crystal and taking into account some structural analogs of these materials, the anomalies of the high-pressure optical spectra are explained.
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Translated from Pis’ma v Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 80, No. 6, 2004, pp. 482–488.
Original Russian Text Copyright © 2004 by Gavriliuk, Kharlamova, Lyubutin, Troyan, Ovchinnikov, Potseluiko, Eremets, Boehler.
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Gavriliuk, A.G., Kharlamova, S.A., Lyubutin, I.S. et al. Structural and electronic transitions in gadolinium iron borate GdFe3(BO3)4 at high pressures. Jetp Lett. 80, 426–432 (2004). https://doi.org/10.1134/1.1830662
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DOI: https://doi.org/10.1134/1.1830662