Structure and Physical Properties of Na1/2Bi1/2TiO3-CdTiO3Solid Solutions

Dunce, M.; Birks, E.; Antonova, M.; Zauls, V.; Kundzinsh, M.; Fuith, A.

doi:10.1080/00150193.2011.578502

Cited by 1 publication

(5 citation statements)

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“…Since the composition with x=0.7 is located close to the concentration range where ferroelectric phase exists, the observed anisotropic microstrains can be explained by influence of residual ferroelectric state. The presence of weak maximum in the temperature dependence of dielectric permittivity [13] supports such an assumption.…”

Section: Resultsmentioning

confidence: 67%

“…Interestingly, the solid solutions with 0.4≤x≤0.6 are ferroelectric at room temperature. A distinct first order phase transition is revealed by discontinuity in temperature dependence of thermal expansion coefficient [13]. On the other hand, the solid solutions with 0.05≤x≤0.3 do not show any signs of a phase transition.…”

Section: Introductionmentioning

confidence: 90%

“…(1-x)(Na0.5Bi0.5)TiO3-xCdTiO3 ((1-x)NBT-xCdT) ceramics were prepared by solid state reaction from chemicalgrade oxides as described in ref. [13]. Samples for dielectric and polarization measurements were prepared in form of 0.5 mm thick ceramic disks with Au electrodes fired at 500˚C.…”

Section: Methodsmentioning

confidence: 99%

“…On the other hand, the solid solutions with 0.05≤x≤0.3 do not show any signs of a phase transition. They have lower dielectric response and exhibit relaxor properties [13]. The solid solutions with x≥0.7 are paraelectric at room temperature [13,14], just as CdTiO3.…”

Section: Introductionmentioning

confidence: 99%

“…Since they had used only pseudocubic approach, there was no information about possible space groups of these compounds. In our previous study [13], we had presented some information about structural properties of (1-x)NBT-xCdT solid solutions.…”

Section: Introductionmentioning

confidence: 99%

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Novel octahedral tilt system a + b + c + in (1 − x)Na0.5Bi0.5TiO3–xCdTiO3 solid solutions

et al. 2017

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(1-x)Na0.5Bi0.5TiO3-xCdTiO3 solid solutions in the whole concentration range (0.0≤x≤1.0) were studied by means of x-ray diffraction, dielectric spectroscopy and polarization measurements. The study was mainly focused on crystalline structure of the compositions, depending on their place in the phase diagram. The solid solution system exhibits at least four different phases at room temperature, giving rise to paraelectric, ferroelectric and relaxor-ferroelectric behaviour. There were proposed appropriate space groups for each of these phases, using Rietveld refinement method for analysis of the x-ray diffraction patterns and taking into account polarization measurement results. Unexpected and unusual octahedral tilt systemsa + a + a + and a + b + c +were found in certain CdTiO3 concentration ranges. The tilt system a + b + c + , which was detected in the ferroelectric phase, was evidenced for the first time, as it has been theoretically predicted, but never experimentally observed before in any material. It was shown that ferroelectricity in (1-x)Na0.5Bi0.5TiO3-xCdTiO3 solid solutions arises not only from the Ti +4 displacements, but also from the polar distortions in square planar and cubooctahedral cation Asites. Upon heating, at a phase transition from the ferroelectric to the paraelectric state, a + b + c + tilt system transforms into a + a + a +. The studied compositions were compared with (1-x)Na0.5Bi0.5TiO3-xCaTiO3 solid solution system, as CdTiO3 and CaTiO3 are crystallographically very similar. It was revealed that both constituents behave very differently. CaTiO3 in (1-x)Na0.5Bi0.5TiO3-xCaTiO3, even in low concentrations, stabilizes solid solutions in its Pnma space group, unlike its counterpart CdTiO3 in the studied materials.

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Section: Resultsmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations