Dielectric properties of pulsed laser deposited films of PbMg1/3Nb2/3–PbTiO3 and PbSc1/2Nb1/2O3–PbTiO3 relaxor ferroelectrics

Tyunina, M.; Levoska, J.; Sternberg, A.; Leppävuori, S.

doi:10.1063/1.371497

Cited by 51 publications

(7 citation statements)

References 33 publications

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“…The broadening of the phase transition is better illustrated by plotting the reduced dielectric constant (ε′/ε m ) as a function of reduced temperature, τ [= (T -T m )/T m ] at different frequencies ( figure 6). The full width of the plot has very little dispersion over a wide frequency range similar to the observation made in other relaxor materials (Tyunina et al 1999).…”

Section: Resultssupporting

confidence: 79%

Relaxor behaviour of (Ba0·5Sr0·5)(Ti0·6Zr0·4)O3 ceramics

et al. 2008

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Ba 0⋅5 Sr 0⋅5 Ti 0⋅6 Zr 0⋅4 O 3 ceramic has been prepared through solid state reaction route. X-ray diffraction shows that the sample has cubic perovskite structure with space group Pm-3m at room temperature. Temperature dependent dielectric study of the ceramic has been investigated in the frequency range 50 Hz-1 MHz. The density of the sample is determined using Archimedes' principle and is found to be ~99% of X-ray density. The dielectric study revealed diffuse phase transition of second order. A broad dielectric anomaly coupled with the shift of dielectric maxima toward a higher temperature with increasing frequency indicates the relaxor-type behaviour in the ceramics. The index of relaxation (γ) and the broadening parameter (Δ) were estimated from a linear fit of the modified Curie-Weiss law. The value of γ ~ 1⋅72 indicates the strong relaxor nature of the ceramic. A remarkably good fit to the Vogel-Fulcher relation further supports such a relaxor nature.

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Section: Resultssupporting

confidence: 79%

Relaxor behaviour of (Ba0·5Sr0·5)(Ti0·6Zr0·4)O3 ceramics

et al. 2008

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“…Reduced temperature (t) is defined as T ÀT m ð Þ T m . The full width of the plot has very little dispersion over a wide frequency range similar to the observation made in other relaxor materials [21].…”

Section: Permittivity Variation In the High Temperature Sidesupporting

confidence: 79%

“…It appears that substitution of Dy causing nano-scale compositional heterogeneity due to presence of defects [21][22][23][24] creating nano polar domains. It has been suggested that polar nano-domains are responsible for the relaxational behavior in PMN and PLZT [10] systems.…”

Section: Permittivity Variation In the High Temperature Sidementioning

confidence: 99%

Ferroelectric relaxor behavior in Ba0.925Dy0.075TiO3 ceramic

Panigrahi

2011

J Electroceram

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Temperature and frequency dependence dielectric permittivity of Ba 0.925 Dy 0.075 TiO 3 ceramic has been studied in the temperature range of 100 K to 350 K at the frequencies, 1 Khz, 10 KHz, 100 KHz and 1 MHz for the first time. Diffuse phase transition and frequency dispersion is observed in the permittivity-vs-temperature plots. This has been attributed to the occurrence of relaxor ferroelectric behavior. The observed relaxor behavior has been quantitatively characterized based on phenomenological parameters. A comparison with the Zr doped BaTiO 3 has also been presented. The microstructure of as sintered samples shows a dense and almost uniform micrograph with some impurity phases, and the grains are almost spherical.

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“…5). The plot has only a very little dispersion over a wide frequency range similar to the observation in other relaxors [49,50], confirming the ferroelectric relaxor nature of Sr 2 FeTiO 6 .…”

Section: Dielectric Propertiessupporting

confidence: 78%