Displacive to Order-Disorder Two-Step Phase Transition Model for Para-Ferroelectric Transition

Quantum-tunneling transitions and exact statistical mechanics of bistable systems with parametrized Dikandé–Kofané double-well potentials

“…In low-dimensional systems, structural phase transitions are triggered by symmetry breakings that induce phase instabilities under specific conditions [1][2][3][4][5][6][7][8]. In general these instabilities are governed by changes in equilibrium properties of the systems, and in the displacive regime [3][4][5][6] they can be accompanied by defects in their topological structures including disclinations, discommensurations, domain walls, large-amplitude charge-density waves (phasons) and instantons to name these few ones.…”

“…In low-dimensional systems, structural phase transitions are triggered by symmetry breakings that induce phase instabilities under specific conditions [1][2][3][4][5][6][7][8]. In general these instabilities are governed by changes in equilibrium properties of the systems, and in the displacive regime [3][4][5][6] they can be accompanied by defects in their topological structures including disclinations, discommensurations, domain walls, large-amplitude charge-density waves (phasons) and instantons to name these few ones. Characteristic properties of these structural defects, which are usually referred to as solitons or solitary waves [9,10], have attracted a great deal of attention over the past years given their widespread applications in a broad range of physical contexts [9,10].…”

Description of an original molecular ordering process into a disordered crystalline form: the atypical low-temperature transformation of the disordered form III of linezolid

“…The detection of a lattice mode mimicking a softening recognized as the criterion of a displacive phase transformation 16,23 and the existence of a distribution of molecular conformations at lowtemperature could suggest the description of the low-temperature phase transformation of form III as a hybrid displacive -order/ disorder transition, as previously observed in several compounds. 19,24 However, the absence of symmetry breaking, the evidence of a distribution of molecular conformations and the temperature dependence of two vibrational modes indicate an order-disorder mechanism. This uncommon III -III 0 transformation can be reported in a Gibbs diagram in Fig.…”

Quantum-tunneling transitions and exact statistical mechanics of bistable systems with parametrized Dikandé-Kofané double-well potentials

“…In low-dimensional systems, structural phase transitions are triggered by symmetry breakings that induce phase instabilities under specific conditions [1,2,3,4,5,6,7,8]. In general these instabilities are governed by changes in equilibrium properties of the systems, and in the displacive regime [3,4,5,6] they can be accompanied by defects in their topological structures including disclinations, discommensurations, domain walls, large-amplitude charge-density waves (phasons) and instantons to name these few ones.…”

“…In low-dimensional systems, structural phase transitions are triggered by symmetry breakings that induce phase instabilities under specific conditions [1,2,3,4,5,6,7,8]. In general these instabilities are governed by changes in equilibrium properties of the systems, and in the displacive regime [3,4,5,6] they can be accompanied by defects in their topological structures including disclinations, discommensurations, domain walls, large-amplitude charge-density waves (phasons) and instantons to name these few ones. Characteristic properties of these struca e-mail: fernand.naha.nz@gmail.com b e-mail: dikande.alain@ubuea.cm (Corresponding author) c e-mail: esmkam@yahoo.com tural defects, which are usually referred to as solitons or solitary waves [9,10], have attracted a great deal of attention over the past years given their widespread applications in a broad range of physical contexts [9,10].…”