Deviation from Curie-Weiss behavior in relaxor ferroelectrics

Viehland, Dwight; Jang, S. J.; Cross, L. E.; Wuttig, Manfred

doi:10.1103/physrevb.46.8003

Cited by 538 publications

(330 citation statements)

References 15 publications

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“…Experimental data from neutron scattering, 2 nuclear magnetic resonance (NMR) 3 and measurements of nonlinear dielectric susceptibility, 3,4 pointed to the existence of a nonergodic structural glassy state in relaxors below a certain temperature. It is usually believed 3,5,6 that reorientational polar species responsible for the glassy behavior are composed of the clusters of low-symmetry structure having a size of a few nanometers, which were observed in relaxors. Recently, by means of dielectric spectroscopy, Bokov and Ye [7][8][9] have discovered a universal relaxor dispersion in PMN and related materials with different degrees of ferroelectric ordering, and showed that it is an important common property of relaxor ferroelectrics.…”

Section: Introductionmentioning

confidence: 99%

Development of ferroelectric order in relaxor(1−x)Pb(Mg1/3
Ye
¹
,
Bing
²
,
Gao
³

et al. 2003
Phys. Rev. B

165

106

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The microstructure and phase transition in relaxor ferroelectric Pb(Mg 1/3 Nb 2/3 )O 3 (PMN) and its solid solution with PbTiO 3 (PT), PMN-xPT, remain to be one of the most puzzling issues of solid state science. In the present work we have investigated the evolution of the phase symmetry in PMN-xPT ceramics as a function of temperature (20 K < T < 500 K) and composition (0 ≤ x ≤ 0.15) by means of high-resolution synchrotron x-ray diffraction. Structural analysis based on the experimental data reveals that the substitution of Ti 4+ for the complex B-site (Mg 1/3 Nb 2/3 ) 4+ ions results in the development of a clean rhombohedral phase at a PT-concentration as low as 5%. The results provide some new insight into the development of the ferroelectric order in PMN-PT, which has been discussed in light of the kinetics of polar nanoregions and the physical models of the relaxor ferroelectrics to illustrate the structural evolution from a relaxor to a ferroelectric state.

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Section: Introductionmentioning

confidence: 99%

Development of ferroelectric order in relaxor(1−x)Pb(Mg1/3
Ye
¹
,
Bing
²
,
Gao
³

et al. 2003
Phys. Rev. B

165

106

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“…4,5 A Vogel-Fulcher-type freezing of polarization fluctuations was observed by analysis of dielectric relaxation. Long-range order does not appear on cooling in the absence of an applied electric field.…”

mentioning

confidence: 99%

Importance of structural irregularity on dielectric loss in (1−x)Pb(Mg1/3Nb2/3)O3−(x)PbTiO3 crystals

Priya

Viehland

Uchino

2002

Applied Physics Letters

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The dielectric properties of (1−x)Pb(Mg1/3Nb2/3)O3−(x)PbTiO3 (PMN–PT) crystals have been investigated over a temperature range of 4 to 450 K at various frequencies. At low temperatures, an unusual frequency dependent plateau region in the absorption was observed between 75 and 175 K. At both higher and lower temperatures, the absorption was frequency independent. Analysis of the relaxation time constant revealed power-law divergence, typical of fractal behavior in disordered magnetic systems. The results demonstrate the importance of structural irregularities on the dielectric loss mechanism in poled oriented PMN–PT crystals.

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“…Thus, according to the literature, this deviation from the Curie-Weiss law at T = T B indicates the appearance of nanopolar regions in the PLT30 during the cooling process. 6,35,36 B. Structural properties: Formation of a long-range order structure Figure 2͑a͒ shows selected diffraction peaks of the PLT30 sample as a function of temperature.…”

Section: Methodsmentioning

confidence: 99%

“…Thus, the new contribution of the present result is that it reveals clearly the existence of a local tetragonal disorder around Ti atoms for temperatures far below and above the maximum of the dielectric permittivity maximum ͑T m ͒, even for temperatures above T B , where according to the literature, the polar nanodomains are not yet formed. 6,35,36 Figures 5͑a͒ and 5͑b͒ shows, respectively, the EXAFS spectra of CaTiO 3 and PLT30 samples obtained at temperatures below and above the maximum of dielectric permittivity of the PLT30 sample. The EXAFS spectra of CaTiO 3 and PLT30 were collected at the same temperatures: 20, 120, 300, and 500 K. Figures 5͑c͒ and 5͑d͒ shows, respectively, the Fourier transform ͑FT͒ amplitude curves obtained from the EXAFS spectra presented in Figs.…”

Section: A Dielectric Propertiesmentioning

confidence: 99%

Spontaneous long and short-range ferroelectric ordering in Pb0.55La0.30TiO3 ceramics

Mastelaro

Mascarenhas

Neves

et al. 2010

Journal of Applied Physics

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Bismuth-induced ferroelectric relaxor behavior in paraelectric LaAlO3 J. Appl. Phys. 110, 094107 (2011) Weak-relaxor behaviour in Bi/Yb-doped KNbO3 ceramics Appl. Phys. Lett. 99, 192901 (2011) The effects of polarization dynamics and domain switching energies on field induced phase transformations of perovskite ferroelectrics Appl. Phys. Lett. 99, 162903 (2011) Electrocaloric effect in relaxor ferroelectrics J. Appl. Phys. 110, 074113 (2011) On the phase identity and its thermal evolution of lead free (Bi1/2Na1/2)TiO3-6mol% BaTiO3 J. Appl. Phys. 110, 074106 (2011) Additional information on J. Appl. Phys. In this work, we investigated the temperature dependence of short and long-range ferroelectric ordering in Pb 0.55 La 0.30 TiO 3 relaxor composition. High-resolution x-ray powder diffraction measurements revealed a clear spontaneous macroscopic cubic-to-tetragonal phase transition in the PLT relaxor sample at ϳ60 K below the maximum of the dielectric constant peak ͑T m ͒. Indeed, the x-ray diffraction ͑XRD͒ data showed that at 300 K ͑above T m but below the Burns temperature, T B ͒ the long-range order structure corresponds to a macroscopic cubic symmetry, space group number 221 ͑Pm-3m͒, whereas the data collected at 20 K revealed a macroscopic tetragonal symmetry, space group number 99 ͑P4mm͒ with c / a = 1.0078, that is comparable to that of a normal ferroelectric. These results show that for samples with tetragonal composition, the long-range ferroelectric order may be recovered spontaneously at cryogenics temperatures, in contrast to ferroelectric samples with rhombohedral symmetry. On the other hand, x-ray absorption spectroscopy investigations intriguingly revealed the existence of local tetragonal disorder around Ti atoms for temperatures far below T m and above T B , for which the sample presents macroscopic tetragonal and cubic symmetries, respectively.

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Deviation from Curie-Weiss behavior in relaxor ferroelectrics

Cited by 538 publications

References 15 publications

Development of ferroelectric order in relaxor(1−x)Pb(Mg1/3
Ye
¹
,
Bing
²
,
Gao
³

et al. 2003
Phys. Rev. B

Development of ferroelectric order in relaxor(1−x)Pb(Mg1/3
Ye
¹
,
Bing
²
,
Gao
³

et al. 2003
Phys. Rev. B

Importance of structural irregularity on dielectric loss in (1−x)Pb(Mg1/3Nb2/3)O3−(x)PbTiO3 crystals

Spontaneous long and short-range ferroelectric ordering in Pb0.55La0.30TiO3 ceramics

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Deviation from Curie-Weiss behavior in relaxor ferroelectrics

Cited by 538 publications

References 15 publications

Development of ferroelectric order in relaxor(1−x)Pb(Mg1/3Ye1, Bing2, Gao3 et al. 2003Phys. Rev. B

Development of ferroelectric order in relaxor(1−x)Pb(Mg1/3Ye1, Bing2, Gao3 et al. 2003Phys. Rev. B

Importance of structural irregularity on dielectric loss in (1−x)Pb(Mg1/3Nb2/3)O3−(x)PbTiO3 crystals

Spontaneous long and short-range ferroelectric ordering in Pb0.55La0.30TiO3 ceramics

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Resources

About

Development of ferroelectric order in relaxor(1−x)Pb(Mg1/3
Ye
¹
,
Bing
²
,
Gao
³

et al. 2003
Phys. Rev. B

Development of ferroelectric order in relaxor(1−x)Pb(Mg1/3
Ye
¹
,
Bing
²
,
Gao
³

et al. 2003
Phys. Rev. B