Driving force for the proper ferroelastic phase transitions induced by cation exchange

Abstract

Europhysics Letter was launched more than fifteen years ago by the European Physical Society, the Société Française de Physique, the Società Italiana di Fisica and the Institute of Physics (UK) and owned now by 17 National Physical Societies/Institutes. Europhysics Letters aims to publish short papers containing non-trivial new results, ideas, concepts, experimental methods, theoretical treatments, etc. which are of broad interest and importance to one or several sections of the physics community. Europhysics letters provides a platform for scientists from all over the world to offer their results to an international readership.

Symmetry of reentrant tetragonal phase inBa1−xNaxFe2As2: Magnetic versus orbital ordering mechanism

“…in these systems (different sign of chemical pressure which works as the driving force for proper ferro-elastic transformations 14 ) while transition temperatures are almost the same. These observations imply that the I4/mmm1 ′ → F mmm1 ′ structural transition has a purely electronic origin.…”

Na2TiGeO5: Crystal structure stability at low temperature and high pressure

“…The isostructural compound Li 2 TiGeO 5 (LTGO) exhibits interesting physical properties such as ionic conductivity and a structural phase transition of ferroelastic nature [6]. Ferroelastics are currently the subject of various studies, because they can be widely used in acousto-optic and acousto-electric devices [7]. It is thus essential for both basic research and technological aspects of design and fabrication to define the thermodynamic conditions generating elastic instabilities and mechanical twinning occurring in these materials.…”