Preparations and properties of low loss Sr1−xBaxNb2O6 ferroelectric single crystals

Maciolek, R. B.; Liu, S. T.

doi:10.1007/bf02666152

Cited by 51 publications

(4 citation statements)

References 10 publications

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“…While both SrTa 2 O 6 and SrNb 2 O 6 are nonpolar compounds with the TTB structure, related compounds containing Pb, Sr, Ba, Ca, and Mg ions are ferroic. Solid solutions of barium and strontium metaniobates (SBN) also adopt the TTB structure, which neither end member exhibits, and have applications in electrooptic, pyroelectric, piezoelectric, and photorefractive devices. Similar applications have been described for PbNb 2 O 6 solid solutions.…”

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confidence: 99%

A “Chimie Douce” Sythesis of Perovskite-Type SrTa₂O₆ and SrTa_2-xNb_xO₆¹

Ollivier

Mallouk

1998

Chem. Mater.

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Chimie douce", or soft chemistry, represents a simple and useful route to metastable solid-state compounds. These terms have historically been used to describe several types of low-temperature solid-solid transformations such as intercalation/deintercalation, ion exchange, hydrolysis, and redox reactions. 2 The common feature of soft chemical reactions is that they produce metastable compounds that are structurally related to the parent solid, by preserving the atomic connectivity of small building blocks and/or extended structural elements. Some interesting examples of unusual phases made by soft chemistry include ReO 3like MoO 3 , 3 Ti 2 Nb 2 O 9 , 4 hexagonal WO 3 , 5 TiO 2 -B, 6 VS 2 , 7 and layered double hydroxides. 8 In general, it is not possible to prepare these compounds using high-temperature routes. Some of these low-temperature compounds have special properties, such as reversible intercalation, photoconductivity, or catalytic activity, which are not found in high-temperature, stable phases of the same composition.We report in this paper a chimie douce reaction that converts a layered perovskite phase into a metastable three-dimensional perovskite. The topochemical transformation is illustrated in Figure 1. In this series of reactions, the lamellar compound K 2 SrTa 2 O 7 and isostructural K 2 SrTa 2-x Nb x O 7 (x ) 0.2, 0.4) are first ionexchanged to the corresponding acid forms and then topochemically dehydrated to yield metastable perovskite phases SrTa 2 O 6 and SrTa 2-x Nb x O 6 . The process is similar to that previously reported for ion-exchange and condensation of K 2 Ln 2 Ti 3 O 10 . 10 Further heating causes the transformation to the structurally unrelated tetragonal tungsten bronze phases of the same composition. This transformation is interesting because K 2 -SrTa 2 O 7 is a member of a large class of structurally related compounds 9 (the Ruddlesden-Popper phases,

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mentioning

confidence: 99%

A “Chimie Douce” Sythesis of Perovskite-Type SrTa₂O₆ and SrTa_2-xNb_xO₆¹

Ollivier

Mallouk

1998

Chem. Mater.

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“…On the other hand, the application of a sufficiently large electric field leads to the formation of macroscopic needle domains. This transition into a state of highly ordered macroscopic domains is accompanied by a strong change in the macroscopically observed electric displacement [4,5]. Subsequent field inversions only permit to switch about 15% of the initially observed polarization change.…”

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confidence: 93%

Discontinuous domain wall motion in the relaxor ferroelectric Sr _0.61 Ba _0.39 Nb ₂ O ₆

Granzow

Woike

2004

Europhys. Lett.

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The relaxor ferroelectric strontium-barium-niobate is characterized by internal random electric fields at the origin of its relaxor behavior. The electric poling cycle induces an irreversible transition into a ferroelectric state accompanied by a large flow of mobile charges. Bipolar fields applied in the poled state yield no acoustic emissions for half-cycles in poling direction. In contrast, discontinuous domain wall movement is observed under reverse fields. The data cannot be explained by homogeneous clouds or gradients of space charge, but necessitate charge cluster formation to a certain degree. The irreversibility of the poling process necessitates charge carrier activation by large electric fields.

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“…A unique feature of SBN is that it facilitates the obtaining of tailor made materials with desired Curie temperature, ferroelectric properties, dielectric constant and microstructures by changing the composition [2,3]. For these reasons SBN solid solutions find importance in many technological applications such as electro-optic [4,5], pyroelectric [2,6], piezoelectric [7] and photorefractive devices [8,9]. SBN, x = 0.61 composition has attracted much attention due to the possibility to grow crystals of the congruently melting composition and showing very good optical quality [10].…”

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confidence: 99%

Effect of 90° domain on ferroelectric properties of alkali modified SBN

Mohiddon¹,

Yadav²

2008

J. Phys. D: Appl. Phys.

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(Li0.5K0.5)2x (Sr0.61Ba0.39)1−xNb2O6 (SBN) was prepared by the chemical co-precipitation method. X-ray analysis shows the formation of a single phase tungsten bronze tetragonal structure. Tetragonal unit cell parameters were found to increase with alkali doping up to x = 0.12 along with the tetragonal distortion ratio (c/a). The crystallite size calculated from Scherrer's equation and the grain size determined from SEM micrographs were found to increase with alkali doping up to x = 0.20. Dielectric measurements as a function of temperature show that the Curie temperature shifts towards higher temperature with alkali doping; however, maximum dielectric constant (εmax) and remanent polarization (Pr) were found to increase up to x = 0.12 and then decrease, which is expected to be due to the variation of c/a ratio and density of the sample in the same fashion. Further, the frequency dependent saturation polarization (Pmax) analysis shows a decay of Pmax with frequency, which was expected to be due to the 90° domain contribution at lower frequencies. This decay was found to be well pronounced for SBN, x = 0.12 composition, which suggests the large 90° domain contribution in this composition. This observation is supported by a frequency dependent backswitching study. Fatigue measurement of Pr and Ec carried up to 9 × 105 cycles shows that the samples have best fatigue behaviour up to x = 0.12 composition.

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Preparations and properties of low loss Sr1−xBaxNb2O6 ferroelectric single crystals

Cited by 51 publications

References 10 publications

A “Chimie Douce” Sythesis of Perovskite-Type SrTa₂O₆ and SrTa_2-xNb_xO₆¹

A “Chimie Douce” Sythesis of Perovskite-Type SrTa₂O₆ and SrTa_2-xNb_xO₆¹

Discontinuous domain wall motion in the relaxor ferroelectric Sr _0.61 Ba _0.39 Nb ₂ O ₆

Effect of 90° domain on ferroelectric properties of alkali modified SBN

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Preparations and properties of low loss Sr1−xBaxNb2O6 ferroelectric single crystals

Cited by 51 publications

References 10 publications

A “Chimie Douce” Sythesis of Perovskite-Type SrTa2O6 and SrTa2-xNbxO61

A “Chimie Douce” Sythesis of Perovskite-Type SrTa2O6 and SrTa2-xNbxO61

Discontinuous domain wall motion in the relaxor ferroelectric Sr 0.61 Ba 0.39 Nb 2 O 6

Effect of 90° domain on ferroelectric properties of alkali modified SBN

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A “Chimie Douce” Sythesis of Perovskite-Type SrTa₂O₆ and SrTa_2-xNb_xO₆¹

A “Chimie Douce” Sythesis of Perovskite-Type SrTa₂O₆ and SrTa_2-xNb_xO₆¹

Discontinuous domain wall motion in the relaxor ferroelectric Sr _0.61 Ba _0.39 Nb ₂ O ₆