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- Title
Structural and Electronic Transitions in Gadolinium Iron Borate GdFe<sub>3</sub>(BO<sub>3</sub>)<sub>4</sub> at High Pressures.
- Authors
Gavriliuk, A. G.; Kharlamova, S. A.; Lyubutin, I. S.; Troyan, I. A.; Ovchinnikov, S. G.; Potseluiko, A. M.; Eremets, M. I.; Boehler, R.
- 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 first-order 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. © 2004 MAIK “Nauka / Interperiodica”.
- Subjects
GADOLINIUM; X-ray diffraction; PHASE transitions; STATISTICAL physics; SEMICONDUCTORS; HIGH pressure (Science); PHYSICS research
- Publication
JETP Letters, 2004, Vol 80, Issue 6, p426
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/1.1830662