6533b829fe1ef96bd128977a
RESEARCH PRODUCT
Experimental evidence for pressure-driven isostructural and symmetry-breaking phase transitions on Bi14CrO24
Daniel ErrandoneaA. K. TyagiDavid Santamaría-pérezSrungarpu N. Acharysubject
DiffractionPhase transitionEquation of stateChemistryThermodynamicsGeneral ChemistryCondensed Matter PhysicsCrystallographyPhase (matter)Materials ChemistrySymmetry breakingIsostructuralAnisotropyMonoclinic crystal systemdescription
Abstract We performed in situ X-ray diffraction experiments on Bi 14 CrO 24 under pressure up to 17.4 GPa. We discovered two reversible phase transitions that take place at 7.3 and 12.1 GPa. The first transition is isostructural and the second-transition involves a tetragonal-monoclinic symmetry reduction. Both transitions involve a small volume collapse indicating that they have a first-order character. For the three observed phases we determined a P – V equation of state. All of them are highly compressible having bulk moduli that range from 64 to 70 GPa. We also determined the axial compressibilities for difference phases, being the response of the structures to pressure anisotropic. This behavior is more notorious in the high-pressure monoclinic phase. Finally, the observed structures are related and compared with the two previously known polymorphs of Bi 14 CrO 24 .
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-03-01 | Solid State Communications |