Ferroelastic Phase Transition in Li2TiGeO5 Crystals

Evidence of ferroelastic–ferroelastic phase transition in BiMoxW1−xO6 compounds

“…4͑b͒, for the BW sample. 1, at temperatures close to those reported by Watanabe 15 for BW, together with the shape of the anomalies in the dielectric constant 16 and the dc electrical conductivity behavior, provide additional reasons to propose that we are dealing with a ferroelastic 17 phase transition. 14 The most outstanding features of the elastic anomaly are the narrow downward peak in the Young's modulus, its reversible character in the heatingcooling cycle, and the small thermal hysteresis.…”

Temperature evolution of the ferroelastic order parameter of Li2TiGeO5

“…Hence, it is known that spontaneous strain is connected with the deformation of unit cell in a-and b-direction, what is well confirmed by domain observation in XY plane [8].…”

“…The ferroelasticity in Li 2 TiGeO 5 (LTGO) has been reported by Poprawski et al [8] who, using polarizing microscope, observed the appearance of ferroelastic domain walls below 233.5 K. The ferroelastic character of the phase transition in LTGO was one year later confirmed by studies of electric permittivity, thermal, optical and elastic properties, and in Brillouin experiments [9].…”

The influence of ferroelastic domain formation on thermal conductivity in Li2TiGeO5 ceramics

“…Li 2 TiGeO 5 was first synthesized in 1999 [2] and its ferroelastic properties have been reported by Poprawski et al [3]. Li 2 TiGeO 5 may be considered as a layered structure with alternating layers of TiO 5 pyramids sharing the basal O(2) atoms with GeO 4 tetrahedra, and cationic layers of Li ?…”