Phase transitions and relaxor properties of doped quantum paraelectrics

Kleemann, W.; Dec, J.; Wang, Y.G; Lehnen, P.; Prosandeev, Sergey

doi:10.1016/s0022-3697(99)00278-4

Cited by 47 publications

(36 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, being placed in a highly polarizable lattice, they could couple to each other via the soft mode. 20,21 Skanavi et al 13,14 discovered that (Sr 1Ϫ1.5x Bi x )TiO 3 ceramics with moderate Bi content exhibit dispersion similar to relaxor ferroelectrics. They tried to explain this behavior on the basis of hopping ion model.…”

Section: Introductionmentioning

confidence: 99%

Broad-band dielectric spectroscopy ofSrTiO3:Biceramics

et al. 2004

View full text Add to dashboard Cite

Lattice dynamics and dielectric relaxation phenomena of (Sr 1Ϫ1.5x Bi x )TiO 3 ceramics with x ϭ0.0067-0.133 were studied in the temperature range of 10-400 K. The polar TO 1 soft mode in the IR spectra is strongly stiffened by Bi doping and its softening on cooling is gradually stopped. Increasing degree of local polar distortion induced by doping was detected by progressive activation of TO 2 and TO 4 polar modes in the Raman spectra. Wide range (10 2 -1.8ϫ10 9 ; 10 11 -2ϫ10 13 Hz) dielectric spectra were determined and carefully fitted with an appropriate model of relaxation time distribution. At least four relaxation regions were revealed and the dominant thermally activated region was assigned to nanocluster polarization dynamics. The enhanced absorption in the submillimeter range was assigned to anharmonic quasi-Debye losses.

show abstract

Section: Introductionmentioning

confidence: 99%

Broad-band dielectric spectroscopy ofSrTiO3:Biceramics

et al. 2004

View full text Add to dashboard Cite

show abstract

“…[25,26,28]. RFs were additionally introduced in order to describe the observed domains state properties [29]. The result clearly provides evidence that the local disorder field gives rise to the existence of a ferroelectric multi-domain state, and that the dielectric behavior of STO18 under a bias field has an intimate relationship with the domain wall motion.…”

Section: Resultsmentioning

confidence: 91%

Phase transition and random-field induced domain wall response in quantum ferroelectrics SrTi¹⁸O₃: review and perspective

Itoh

Yagi

Uesu

et al. 2004

Science and Technology of Advanced Materials

View full text Add to dashboard Cite

The oxygen isotope exchange of 16 O by 18 O in SrTiO 3 causes a drastic change from paraelectric to ferroelectric, due to the suppression of quantum fluctuation. The phase transition and origin of the huge domain wall response were evaluated by dielectric, magnetic (NMR), and optical measurements (SHG, light scattering). The results obtained corroborate (1) smeared ferroelectric transition at T c due to quenched random field, (2) a quite large dielectric contribution from domain walls, (3) incomplete softening of the transverse optic mode, and (4) a large contribution from the relaxational mode to the phase transition. Quantitative explanations, given to individual results, may give hints to grasp the mechanism for the evolution of ferroelectricity, in which quantum fluctuation and random fields are dominant perturbations. Finally, some of the news studies on the SrTiO 3 were also introduced. q

show abstract

“…19,20,24 -27 In order to explain anomalies occurring at xϾ0.1, the lattice collapse due to the small Ca 2ϩ ion was accounted for by piezoelectric coupling. 25 In the present study on Eu 1Ϫx Ba x TiO 3 (0рxр0.2), similar effects due to the lattice expansion by doping with large Ba 2ϩ ions are taken into account by corrections to the pseudospin density ͑see below͒.…”

Section: Introductionmentioning

confidence: 92%

Coupling between the magnetism and dielectric properties inEu1−xBax
Wu
¹
,
Jiang²,
Shen
³

2004
Phys. Rev. B
36
0
19
0
View full text Add to dashboard Cite

The dielectric constant of the quantum paraelectric EuTiO 3 exhibits a sharp decrease at about 5.5 K, at which temperature antiferromagnetic ordering of the Eu spins simultaneously appears, indicating coupling between the magnetism and dielectric properties. A similar feature has also been detected in Eu 1Ϫx Ba x TiO 3 (0Ͻxр0.2). The random-bond model within the framework of the transverse-field Ising model and the site dilution model based on the Heisenberg model are successfully applied to the Eu 1Ϫx Ba x TiO 3 electrical and magnetic subsystems, respectively. By adding an appropriate coupling term between the magnetic and electrical subsystems, which is related to the interaction of the Heisenberg spin and pseudospin, we investigate intrinsic coupling between the magnetic and electrical subsystems and successfully obtain its special dielectric constant, which is in good agreement with the experimental data.

show abstract

Phase transitions and relaxor properties of doped quantum paraelectrics

Cited by 47 publications

References 50 publications

Broad-band dielectric spectroscopy ofSrTiO3:Biceramics

Broad-band dielectric spectroscopy ofSrTiO3:Biceramics

Phase transition and random-field induced domain wall response in quantum ferroelectrics SrTi¹⁸O₃: review and perspective

Coupling between the magnetism and dielectric properties inEu1−xBax
Wu
¹
,
Jiang²,
Shen
³

2004
Phys. Rev. B
36
0
19
0
View full text Add to dashboard Cite

Contact Info

Product

Resources

About

Phase transitions and relaxor properties of doped quantum paraelectrics

Cited by 47 publications

References 50 publications

Broad-band dielectric spectroscopy ofSrTiO3:Biceramics

Broad-band dielectric spectroscopy ofSrTiO3:Biceramics

Phase transition and random-field induced domain wall response in quantum ferroelectrics SrTi18O3: review and perspective

Coupling between the magnetism and dielectric properties inEu1−xBaxWu1, Jiang2, Shen3 2004Phys. Rev. B360190View full textAdd to dashboardCite

Contact Info

Product

Resources

About

Phase transition and random-field induced domain wall response in quantum ferroelectrics SrTi¹⁸O₃: review and perspective

Coupling between the magnetism and dielectric properties inEu1−xBax
Wu
¹
,
Jiang²,
Shen
³

2004
Phys. Rev. B
36
0
19
0
View full text Add to dashboard Cite