Raman Scattering by Sr<i>x</i>Ba1−<i>x</i>Nb2O6

Amzallag, E.; Chang, T. S.; Pantell, R. H.; Feigelson, R. S.

doi:10.1063/1.1660719

Cited by 48 publications

(29 citation statements)

References 9 publications

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“…The spectra of the (Sr 0:5 Ba 0:5 )Nb 2 O 6 precursor powders are similar to those of the (Sr 0:5 Ba 0:5 ) Nb 2 O 6 single crystals. 29 Three broad and strong A 1 (TO) phonon peaks at 96, 243 and 631 cm À1 were observed. The strong peak at 635 cm À1 was assigned to the elongation of the O-Nb bond.…”

Section: Resultsmentioning

confidence: 99%

A novel sol–gel route to synthesize (Sr0.5Ba0.5)Nb₂O₆ ceramics with enhanced electrocaloric effect

Chen

Liu

et al. 2017

J. Adv. Dielect.

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(Sr 0:5 Ba 0:5 )Nb 2 O 6 ultra-fine powders were synthesized by a novel sol-gel route, and the mechanism of the reaction was discussed. SrCO 3 , BaCO 3 , oxalate niobium and citric acid were used to initiate the sol-gel process, and ethylene glycol (EG) was added to further polymerize the cross-linking structure. The evolution of the (Sr 0:5 Ba 0:5 )Nb 2 O 6 phase, the reaction process and the microstructures were investigated by X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy, DSC-TG and scanning electron microscopy. The synthesis temperature of the (Sr 0:5 Ba 0:5 )Nb 2 O 6 powders reached as low as 1200 C, and the size and morphology of the powders were controlled by temperature. By adjusting the calcination temperature, we obtained (Sr 0:5 Ba 0:5 )Nb 2 O 6 powders with uniform sizes of 20 nm to 500 nm. Then, dense (Sr 0:5 Ba 0:5 )Nb 2 O 6 ceramics were successfully prepared using these ultrafine powders. Finally, an enhanced electrocaloric effect (ECE) value of 0.35 C was obtained at 100 kV/cm.

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Section: Resultsmentioning

confidence: 99%

A novel sol–gel route to synthesize (Sr0.5Ba0.5)Nb₂O₆ ceramics with enhanced electrocaloric effect

Chen

Liu

et al. 2017

J. Adv. Dielect.

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“…This results in 135 vibrational modes including three acoustic ones. These modes are characterized by the irreducible representations 1 A , 2 A , 1 B , 2 B and , E all except 2 A being Raman active [28]. Two mode frequencies have been mentioned in a work by Burns et al [29] devoted to other tungsten-bronze compounds.…”

Section: Raman Scatteringmentioning

confidence: 95%

Compositional dependence of optical and vibrational properties of strontium barium niobate (Sr_xBa_1–xNb₂O₆)

David

Tunyagi

Betzler

et al. 2007

Physica Status Solidi (b)

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The index of refraction, the optical band edge and the Raman scattering of strontium barium niobate, Sr x Ba 1-x Nb 2 O 6 with 0 38 0 77 x . < < . have been studied. The ordinary refractive index does not depend on x, while the extra-ordinary one increases with increasing x. The band edge is almost unaffected by the Baor Sr-content and shows a weak band bowing. Both the index of refraction and the band edge may be used for an optical determination of the composition of the crystal. Raman spectra show the typical behavior of tungsten bronze type crystals with broad bands and complicated spectral shapes.

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“…Наибольший вклад в интенсивность спектра пленки SBN вносят три широкие полосы в районе 230, 630 и 850 cm −1 , каждая из которых состоит из набора линий (линии от подложки Si экранируются слоем платины). чем теоретически предсказанных мод [12], что связыва-ется в первую очередь с катионной неупорядоченностью в структуре ТВБ [13] и, как следствие, с нарушением правил отбора по волновому вектору в центре зоны Бриллюэна [14]. Поскольку в элементарной ячейке SBN существуют 132 оптические фононные моды, возможно вырождение некоторых из них в одну полосу, что вносит дополнительный вклад в уширение спектра КРС.…”

Section: экспериментальные результаты и обсуждениеunclassified

Структура, динамика решетки и диэлектрические характеристики пленок Sr-=SUB=-0.5-=/SUB=-Ba-=SUB=-0.5-=/SUB=-Nb-=SUB=-2-=/SUB=-O-=SUB=-6-=/SUB=-

Pavlenko¹,

Zakharchenko²,

Анохин³

et al. 2017

Физика Твердого Тела

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Методом высокочастотного напыления в атмосфере кислорода получены пленки твердого раствора Sr 0.5 Ba 0.5 Nb 2 O 6 на подложке (111)Pt/(001)Si. Изучены их деполяризованные спектры комбинационного рас-сеяния света, структура и диэлектрические характеристики в широком диапазоне температур. Установлено, что пленки однофазны, обладают структурой тетрагональной вольфрамовой бронзы, имеют ярко выраженную аксиальную текстуру с осью 001, направленной перпендикулярно поверхности подложки. Показано, что в интервале температур 300−425 K в материале пленки происходит размытый фазовый переход в состояние сегнетоэлектрика-релаксора. Обсуждаются возможные причины выявленных закономерностей.Работа выполнена в рамках реализации государственного задания на 2016 г № 007-01114-16 ПР (про-ект № 0256-2014-0002) и гранта РФФИ № 16-32-60095 мол_а_дк.

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Raman Scattering by SrxBa1−xNb2O6

Cited by 48 publications

References 9 publications

A novel sol–gel route to synthesize (Sr0.5Ba0.5)Nb₂O₆ ceramics with enhanced electrocaloric effect

A novel sol–gel route to synthesize (Sr0.5Ba0.5)Nb₂O₆ ceramics with enhanced electrocaloric effect

Compositional dependence of optical and vibrational properties of strontium barium niobate (Sr_xBa_1–xNb₂O₆)

Структура, динамика решетки и диэлектрические характеристики пленок Sr-=SUB=-0.5-=/SUB=-Ba-=SUB=-0.5-=/SUB=-Nb-=SUB=-2-=/SUB=-O-=SUB=-6-=/SUB=-

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Raman Scattering by SrxBa1−xNb2O6

Cited by 48 publications

References 9 publications

A novel sol–gel route to synthesize (Sr0.5Ba0.5)Nb2O6 ceramics with enhanced electrocaloric effect

A novel sol–gel route to synthesize (Sr0.5Ba0.5)Nb2O6 ceramics with enhanced electrocaloric effect

Compositional dependence of optical and vibrational properties of strontium barium niobate (SrxBa1–xNb2O6)

Структура, динамика решетки и диэлектрические характеристики пленок Sr-=SUB=-0.5-=/SUB=-Ba-=SUB=-0.5-=/SUB=-Nb-=SUB=-2-=/SUB=-O-=SUB=-6-=/SUB=-

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A novel sol–gel route to synthesize (Sr0.5Ba0.5)Nb₂O₆ ceramics with enhanced electrocaloric effect

A novel sol–gel route to synthesize (Sr0.5Ba0.5)Nb₂O₆ ceramics with enhanced electrocaloric effect

Compositional dependence of optical and vibrational properties of strontium barium niobate (Sr_xBa_1–xNb₂O₆)