Structural stability and electrical properties of Sr2FeMoO6 under high pressure

Abstract

The structural stability and electrical properties of Sr2FeMoO6 under high pressure at room temperature have been studied using energy dispersive x-ray diffraction with synchrotron radiation and resistance and capacitance measurements. The x-ray diffraction results show that the structure of Sr2FeMoO6 remains stable up to 40 GPa. The equation of state of Sr2FeMoO6 is obtained from the V/V0–P relationship. The bulk modulus B0 and its first-order derivative B0′ of Sr2FeMoO6 were calculated based on the Birch–Murnaghan equation. The electrical resistance undergoes a metallic transition at about 2.1 GPa. The metallic transition may be caused by a change in the electronic structure induced by high pressure.

Structural stability and electrical properties of Sr2Fe1+Mo1−O6− under high pressure

“…The lattice parameters are refined from XRD data, and are listed in Table 1. As can be seen from Table 1, the lattice parameters of all the samples are very close to each other, similar to the result of the bulk sample with micrometer is similar to that of Sr 2 FeMoO 6 as well as to that reported previously [13]. Fig.…”

“…Considering the results of energy dispersive X-ray diffraction, the abrupt drop of the resistance and the sharp increase of the capacitance for the two samples can be attributed to an electronic structural transition, which is caused by the compression of the unit cell under high pressure. These results are similar to those observed by Zhao et al in Sr 2 FeMoO 6 of m scale grain size [13]. With the substitution of Fe for Mo, the change of the resistance and the capacitance for the sample becomes relatively tardy in a wider pressure range.…”

Effect of high-pressure on the electronic and magnetic properties in double perovskite oxide Sr2FeMoO6

“…The previous experimental data show that SFMO exhibits I4/mmm symmetry and no crystal structural transition in the large measured pressure range. 25 For checking this result, a global minimization of free-energy surfaces merging ab initio total-energy calculations via PSO technique was employed to searching for the most stable structures of SFMO under various external hydrostatic pressures, implemented in the Crystal structure AnaLYsis by Particle Swarm Optimization (CALYPSO) code. 31 CALYPSO has been successfully applied to many compounds.…”

“…Most of the studies were focused on the effect of pressure on the electric resistivity, magnetoresistance, and capacitance. [25][26][27] Nevertheless, the other physical properties under highpressure, such as spin state, magnetic phase, electronic property, and so on, are scarcely studied. Based on the above fact, we theoretically explored the structural, magnetic, and electronic properties of SFMO under various high external hydrostatic pressures.…”

Structure and magnetic properties in the compounds of Sr2FeMo1−xNbxO6

“…The pellets were sintered at 1100 • C for 3 h in a 1% H 2 /Ar flow, and finally at a temperature of 1125 • C for 16 h with several intermediate grindings. The detailed procedure of sample preparation was described elsewhere [22]. The room temperature X-ray diffraction (XRD) measurements were performed using a Rigaku D/Max-2400 diffractometer with Cu K␣ radiation.…”