Equation of state and electronic properties of EuVO4: A high-pressure experimental and computational study

被引:18
作者
Paszkowicz, Wojciech [1 ]
Lopez-Solano, Javier [2 ,3 ,4 ]
Piszora, Pawel [5 ]
Bojanowski, Bohdan [6 ]
Mujica, Andres [2 ,3 ]
Munoz, Alfonso [2 ,3 ]
Cerenius, Yngve [7 ]
Carlson, Stefan [7 ]
Dabkowska, Hanna [8 ]
机构
[1] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
[2] Univ La Laguna, Dept Fis, MALTA Consolider Team, Tenerife 38205, Spain
[3] Univ La Laguna, Inst Mat & Nanotecnol, Tenerife 38205, Spain
[4] Agencia Estatal Meteorol AEMET, Izana Atmospher Res Ctr, Tenerife 38071, Spain
[5] Adam Mickiewicz Univ, Fac Chem, Dept Chem Mat, PL-61614 Poznan, Poland
[6] Tech Univ Szczecin, Inst Phys, PL-70310 Szczecin, Poland
[7] Lund Univ, MAX Lab 4, SE-22100 Lund, Sweden
[8] McMaster Univ, Brockhouse Inst Mat Res, Hamilton, ON L8S 4M1, Canada
关键词
Rare earth alloys and compounds; Elasticity; Electronic band structure; High pressure; X-ray diffraction; RARE-EARTH ORTHOVANADATES; TOTAL-ENERGY CALCULATIONS; X-RAY-DIFFRACTION; PLANE-WAVE; 1ST-PRINCIPLES CALCULATIONS; TRANSPORT-PROPERTIES; SCHEELITE PHASE; ZIRCON-TYPE; LNVO(4); GD;
D O I
10.1016/j.jallcom.2015.06.211
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Structural, elastic and electronic properties of zircon-type and scheelite-type EuVO4 are investigated experimentally, by in-situ X-ray diffraction using synchrotron radiation, and theoretically within the framework of the density functional theory (DFT) and using the PBE prescription of the exchange-correlation energy. This study was motivated by the fact that the previous knowledge of the equation of state (EOS) was inconclusive due to a large scatter of the experimental and theoretical data, and by the lack of information on the dependence of the electronic structure with pressure. Under the applied experimental conditions, the zircon-type structure transforms to a scheelite-type one at 7.4(2) GPa, whereas the calculations yield a lower zircon-scheelite-coexistence pressure of 4.8 GPa. The experimental part of the study shows that the bulk modulus of the zircon-type phase is 119(3) GPa, perfectly supported by the DFT-calculated value, 119.1 GPa. The bulk modulus for the scheelite-type polymorph is higher, with an experimental value of 135(7) GPa and a theoretical one of 137.4 GPa. Compared to those reported in previous experimental and DFT or semiempirical works, the present values for the zircon-type phase are comparable or slightly lower, whereas those for the scheelite-type phase are markedly lower. Discrepancies between the present results and earlier reported ones are attributed to differences in details of the experimental method such as the pressure transmitting medium and the pressure calibration method. The calculated band structure confirms that zircon-type EuVO4 is a direct-gap semiconductor, with a bandgap energy at zero pressure of 2.88 eV. Under compression, the bandgap of the zircon phase increases with a coefficient of 10.3 meV/GPa up to the transition pressure, at which point the present calculations show a small drop of the bandgap energy. Above the transition pressure, the bandgap energy of the scheelite phase becomes almost constant, with a small pressure coefficient of just 1.5 meV/GPa. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:1005 / 1016
页数:12
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