Li 2 TiGeO 5 --A Novel Ferroelastic Crystal

Przesławski, J.; Poprawski, R.; Just, Marcin; Kireev, V. V.; Mielcarek, S.; Mróz, B.

doi:10.1080/00150190211023

Cited by 9 publications

(9 citation statements)

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“…Since the discovery of ferroelasticity in this material, LTGO has been intensively studied using various experimental methods. The ferroelastic character of the phase transition in LTGO was confirmed by studies of the electric permittivity, the thermal, the optical and the elastic properties [8][9][10].…”

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confidence: 70%

Synthesis and Optical Properties of Pure and Doped M₂TiGeO₅(M = Li and Na) Ceramics

et al. 2012

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Synthesis and Optical Properties of Pure and Doped M₂TiGeO₅(M = Li and Na) Ceramics

et al. 2012

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“…Calorimetric, dilatometric and linear birefringence measurements for Li 2 TiGeO 5 have shown a ferroelastic phase transition at 235 K [8][9][10]. It was reported in Ref.…”

Section: Introductionmentioning

confidence: 83%

Na2TiGeO5: Crystal structure stability at low temperature and high pressure

Waśkowska

Gerward

Olsen

et al. 2008

Journal of Physics and Chemistry of Solids

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The temperature evolution of the lattice parameters measured from 295 to 125 K exhibits a small instability below T c E278 K, indicating ferroelastic properties of Na 2 TiGeO 5 . The behavior is related to the specific crystal structure built of polyhedral layers with shared TiO 5 pyramids and GeO 4 tetrahedra, alternating with layers of Na + cations. Antiparallel alignment of the short apical titanyl bond in adjacent rows of the polyhedral layer gives rise to spontaneous strain, when a distortion of the TiO 5 groups occurs. Single-crystal structures determined at room temperature and 120 K suggest that {1 1 0} domains, developing below T c , entail a tetragonal-toorthorhombic symmetry change. The mechanism is attributed to a shortening of the O-O distance between the polyhedral layers, and to minor shifts of the positions of the Ti atoms and the correlated oxygen atoms along the c-axis. The structure distortion, however, is too small to allow any unambiguous determination of the symmetry-breaking effects. The bulk modulus and its pressure derivative have been determined as B 0 ¼ 89(2) GPa and B 0 0 ¼ 4:0. A pressure-induced phase transformation takes place at P c E12.5 GPa, presumably to an orthorhombic structure. The pressure effect on the transition temperature is given by DT c /DPE1.76 K/GPa. r

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“…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].…”

Section: Introductionmentioning

confidence: 86%

“…Taking into account all these parts, the appropriate thermodynamic potential for the second-order phase transition in LTGO in terms of Landau expansion was proposed [9]:…”

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confidence: 99%

Temperature evolution of the ferroelastic order parameter of Li₂TiGeO₅

Sieradzki

2008

Phase Transitions

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The temperature dependence of the order parameter of Li 2 TiGeO 5 ferroelastic was determined on the basis of several independent measurements: specific heat, birefringence and IR spectroscopy. The estimated temperature evolution of order parameter is in very good agreement with mean field Landau theory in temperature range 40 5 T 5 233.5 K. The character of the above mentioned dependence unequivocally confirms the second-order phase transition in Li 2 TiGeO 5 at 233.5 K.

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Li 2 TiGeO 5 --A Novel Ferroelastic Crystal

Cited by 9 publications

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Synthesis and Optical Properties of Pure and Doped M₂TiGeO₅(M = Li and Na) Ceramics

Synthesis and Optical Properties of Pure and Doped M₂TiGeO₅(M = Li and Na) Ceramics

Na2TiGeO5: Crystal structure stability at low temperature and high pressure

Temperature evolution of the ferroelastic order parameter of Li₂TiGeO₅

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Li 2 TiGeO 5 --A Novel Ferroelastic Crystal

Cited by 9 publications

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Synthesis and Optical Properties of Pure and Doped M2TiGeO5(M = Li and Na) Ceramics

Synthesis and Optical Properties of Pure and Doped M2TiGeO5(M = Li and Na) Ceramics

Na2TiGeO5: Crystal structure stability at low temperature and high pressure

Temperature evolution of the ferroelastic order parameter of Li2TiGeO5

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Product

Resources

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Synthesis and Optical Properties of Pure and Doped M₂TiGeO₅(M = Li and Na) Ceramics

Synthesis and Optical Properties of Pure and Doped M₂TiGeO₅(M = Li and Na) Ceramics

Temperature evolution of the ferroelastic order parameter of Li₂TiGeO₅