6533b871fe1ef96bd12d22ac
RESEARCH PRODUCT
Structural transitions under high-pressure in a langasite-type multiferroic Ba3TaFe3Si2O14
Vadim KsenofontovO. I. BarkalovClaudia FelserEwelina Magos-palasyukS. A. MedvedevT. PalasyukPavel G. NaumovIgor S. Lyubutinsubject
Phase transitionMaterials scienceGeneral ChemistryCondensed Matter PhysicsFerroelectricityDiamond anvil cellsymbols.namesakeCrystallographyPhase (matter)X-ray crystallographysymbolsGeneral Materials ScienceMultiferroicsRaman spectroscopyMonoclinic crystal systemdescription
Abstract The iron containing langasite family compound Ba3Ta57Fe3Si2O14 was studied at high pressure up to 30 GPa at room temperature by means of in situ X-ray diffraction, Raman and Mossbauer spectroscopies in diamond anvil cell. Two structural transitions at pressures ∼5 and ∼20 GPa are observed. At ∼5 GPa, the low-pressure trigonal P321 phase undergoes phase transition to the most likely P3 structure as manifested by slight increase in the c/a ratio and by anomalies of the Mossbauer and Raman spectra parameters. At ∼20 GPa, the first order phase transition to monoclinic structure occurred with a drop of unit cell volume by 9%. The appearance of the ferroelectric state at such transitions is discussed in connection with the multiferroic properties.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-11-01 | Solid State Sciences |