An anomalous ferroelastic phase transition arising from an unusualcis-/anti-conformational reversal of polar organic cations

Abstract

Hybrid ferroelastics have attracted increasing attentions for their potential applications as mechanical switches, among which the sporadically-documented anomalous ferroelastic phase transitions, i.e., ferroelasticity appears in high-temperature phase rather than low-temperature phase, are of particular interests...

Hydrogen-bonding engineering in a 3D cyano-bridged double-perovskite ferroelastic greatly improves the phase-transition temperature

“…50–52 Ferroelastic domains of different orientations have different birefringence characteristics and exhibit different light and dark patterns under orthogonally polarized light. 53,54 Based on the results of the single-crystal structure for 1 , accompanying the phase transition from the HTP to LTP, the symmetry change occurred with an Aizu notation of m 3̄ mF 2/ m , which means that the phase transition should be a ferroelastic one. 55,56 To observe the ferroelastic transition of 1 , the grown single crystal was observed via variable temperature polarization microscopy.…”

H/F substitution activating tunable dimensions and dielectric–optical properties in organic lead-bromide hybrids

“…[10][11][12][13][14] Meanwhile, the abundant ingredients in different dimensional HOIHPs have also provided a great possibility to construct significant ferroic phase transition materials in condensed matter physical systems. [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] While witnessing the prosperity of HOIHPs, however, rational chemical modifications at the molecular level generating adjustable structures and physical properties still remain a challenge.…”

Halogen-Regulated Tc and X-ray Radiation Detection in 2D Hybrid Perovskite Ferroelastic Semiconductor

“…20,21 Specifically, chemical regulation on organic components has been widely used in regulating ferroelasticity. 22,23 For example, hydrogen-halogen/alkane substitution strategies were used to increase the molecular (ion) rotation energy barrier or form new coordination bonds (CB) enhancing the Curie temperature (T c ). 24−26 Besides, metal ion substitution was proved to be a viable performance optimization approach due to the introduced new metal properties and different crystal coordinate fields.…”