Dielectric studies of phase transitions in the ferroelectric CdTiO3 and the Sr1−x CdxTiO3 solid solution

Guzhva, M. E.; Lemanov, V. V.; Markovin, P. A.

doi:10.1134/1.1417196

Cited by 18 publications

(20 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The variation of T C with Cd doping is more complicated, as studied by Guzhva et al [24,50]. For small dopant concentrations, the behaviour is similar to the other phase diagrams studied here; the available data are not numerous enough to allow all the parameters in equation (2) to be fitted with any reliability, but a fit with θ S = 20 K is consistent with the data, as shown in figure 7.…”

Section: Effect Of CD Dopingsupporting

confidence: 73%

“…Phase diagram for the Sr 1−x Cd x TiO 3 system. The points are measurements of the ferroelectric phase transition temperature using the peak in the dielectric susceptibility by Guzhva et al [24,50]. The solid line fits some of these data to a quantum saturation model with θ S = 20 K. The broken lines are fits assuming the existence of a tetragonal ↔ orthorhombic ferroelastic phase transition, which has not yet been observed in this (composition, temperature) range.…”

Section: Effect Of CD Dopingmentioning

confidence: 99%

See 1 more Smart Citation

Interaction between quantum paraelectricity and ferroelasticity in SrTiO₃

Hayward

Morrison

Scott

2005

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

The dielectric susceptibility of SrTiO 3 is measured as a function of temperature between room temperature and 32 K. These data show an anomaly at approximately 105 K, which is associated with the cubic-tetragonal ferroelastic phase transition. The form of this anomaly is shown to be consistent with biquadratic coupling between the ferroelectric and ferroelastic modes. The quantum paraelectric state of SrTiO 3 is studied in the framework of a quantum mechanical Landau potential. The saturation temperature is determined from published measurements of the dielectric susceptibility at very low temperatures. When the coupling to the ferroelastic mode is accounted for, the saturation temperature obtained from these measurements (θ S = 20(1) K) is the same as that seen in phase diagrams for the ferroelectric transition, such as T C versus chemical dopant or O isotope content.

show abstract

Section: Effect Of CD Dopingsupporting

confidence: 73%

Section: Effect Of CD Dopingmentioning

confidence: 99%

Interaction between quantum paraelectricity and ferroelasticity in SrTiO₃

Hayward

Morrison

Scott

2005

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

show abstract

“…This means that the phase transition in CdTiO 3 is far from the tricritical point (the closeness to which was supposed in Ref. 5). Furthermore, since we have d > 2 √ c 1 c 2 , the minima of the total energy correspond to the order parameters ±(ξ, 0) and ±(0, η) and are separated from each other by the energy barriers.…”

Section: Fig 3 Relative Contributions Of Different Modes With B1umentioning

confidence: 99%

“…Therefore, the possibility of successive ferroelectric phase transitions in CdTiO 3 with varying temperature can be most likely ruled out. Possibly, the specific features observed in the dielectric constant of CdTiO 3 near 50 K 3,5,6 are associated with the existence of side minima of the total energy that are separated from the main minima by low potential barriers.…”

Section: Fig 3 Relative Contributions Of Different Modes With B1umentioning

confidence: 99%

“…Since then, this phase transition was studied by dielectric [3][4][5][6] and Xray 3,4,7 methods; using Raman scattering; 3,8 IR and submillimeter reflectance spectroscopy; 9 pyroelectric current measurements. 4 The specific features of the phase transition in CdTiO 3 are a smallness of the lattice distortions and a considerable scatter in the data on the phase transition temperature (50-82 K) and spontaneous polarization (0.002-0.009 C/m 2 ).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ferroelectric phase transition in orthorhombic CdTiO3: First-principles studies

Лебедев

2009

Phys. Solid State

View full text Add to dashboard Cite

The crystal structures and phonon spectra of orthorhombic cadmium titanate with the P bnm structure and of its two possible ferroelectrically distorted phases with P bn21 and P b21m space groups were calculated from first principles within the density functional theory. The obtained structural parameters and frequencies of Raman-and infrared-active modes are in good agreement with available experimental data for the P bnm phase. Expansion of the total energy in a Taylor series of two order parameters showed that the ground state of the system corresponds to the P bn21 structure into which the P bnm phase transforms through a second-order phase transition without intermediate phases. A substantial discrepancy between the calculated and experimentally observed lattice distortions and spontaneous polarization in the polar phase was explained by quantum fluctuations as well as by existence of twinning and competing long-period structures.

show abstract