Crystal structure and ferroelectric properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>A</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ta</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:m

Shimakawa, Yuichi; Kubo, Yoshimi; Nakagawa, Yasuaki; Goto, Shozo; Kamiyama, Takashi; Asano, Hajime; Izumi, Fujio

doi:10.1103/physrevb.61.6559

Cited by 386 publications

(166 citation statements)

References 11 publications

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“…5 (a) it is observed that peak-r ε increases with increasing tungsten concentration. The high T c which is indicative of enhanced polarizability [21,36,[51][52], explains the increase in peak r ε . Moreover, since the valency of the substitutional cation (W 6+ ) is higher than the Ta 5+ , the substitution creates cationic vacancies at Sr-site ( " Sr V ) to maintain electrical neutrality of the lattice structure [22,47,53].…”

Section: Dielectric Studiesmentioning

confidence: 99%

“…University Campus STeP Ri Slavka Krautzeka 83/A 51000 Rijeka, Croatia Phone: +385 (51) Ferroelectric materials exhibit a wide spectrum of functional properties, including switchable polarization, piezoelectricity, high non-linear optical activity, pyroelectricity, and non-linear dielectric behaviour. These properties are crucial for application in electronic devices such as sensors, microactuators, infrared detectors, microwave phase filters and, non-volatile memories.…”

Section: Publisher Intechmentioning

confidence: 99%

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Enhanced Dielectric and Ferroelectric Properties of Donor (W6+, Eu3+) Substituted SBT Ferroelectric Ceramics

Coondoo¹,

Panwar²

2010

Ferroelectrics

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Section: Dielectric Studiesmentioning

confidence: 99%

Section: Publisher Intechmentioning

confidence: 99%

Enhanced Dielectric and Ferroelectric Properties of Donor (W6+, Eu3+) Substituted SBT Ferroelectric Ceramics

Coondoo¹,

Panwar²

2010

Ferroelectrics

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“…69 The ionic displacements could be influenced by several factors, including ionic size, tolerance factor and ionic polarizability. Previous work on Ta based Aurivillius compounds by Shimakawa et al 70 showed the degree of structural distortion to Tc. An estimate of the degree of distortion could be obtained by considering the perovskite tolerance factor t. The distortion of the perovskite structure can be estimated by the geometrical tolerance factor t defined as t = (R B +R O )/(R A +R O ) 1/2 , where R A , R B and R O are the effective radii relative to oxygen of A-site cation, B-site cation and oxygen in the general Aurivillius formula unit, respectively.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

Upconversion luminescence, ferroelectrics and piezoelectrics of Er Doped SrBi4Ti4O15

Peng

Zou

et al. 2012

AIP Advances

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Er3+ doped SrBi4Ti4O15 (SBT) bismuth layered-structure ferroelectric ceramics were synthesized by the traditional solid-state method, and their upconversion photoluminescent (UC) properties were investigated as a function of Er3+ concentration and incident pump power. Green (555 nm) and red (670 nm) emission bands were obtained under 980 nm excitation at room temperature, which corresponded to the radiative transitions from 4S3/2, and 4F9/2 to 4I15/2, respectively. The emission color of the samples could be changed with moderating the doping concentrations. The dependence of UC intensity on pumping power indicated a two-photon emission process. Studies on dielectric properties indicated that the introduction of Er increased the ferroelectric-paraelectric phase transition temperature (Tc) of SBT, thus making this ceramic suitable for piezoelectric sensor applications at higher temperatures. Piezoelectric measurement showed that the doped SBT had a relative higher piezoelectric constant d33 compared with the non-doped ceramics. The thermal annealing behaviors of the doped sample revealed a stable piezoelectric property. The doped SBT showed bright UC emission while simultaneously having increased Tc and d33. As a multifunctional material, Er doped SBT ferroelectric oxide showed great potential in application of sensor, future optical-electro integration and coupling devices

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“…At the beginning of XXI century Miranda et al [8] and A.L.Kholkin et al [9] initiated investigations of the relaxor properties of the discussed materials. The studies were continued by authors of the following papers [10][11][12][13][14][15]. Although the properties were a subject of wide discussion their origin is not entirely clear.…”

Section: Introductionmentioning

confidence: 99%

Influence Of Thermal Treatment On Relaxor Properties Of BaBi2Nb2O9 Ceramics

Adamczyk¹,

Pilch²,

Pawełczyk³

2015

Archives of Metallurgy and Materials

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In the hereby paper the implications of thermal modification of BaBi 2 Nb 2 O 9 ceramics in high vacuum (5×10 −11 bar) at a temperature equal of 1173K are widely discussed. The mentioned modification caused changes in the ions concentration (confirmed by EDS and XPS analysis) and as a consequence an influence on the value of the unit cell parameters as well as on the dielectric and relaxor properties of described ceramics. The obtained results of EDS and XPS analysis of the sample before and after thermal treatment revealed bismuth ions diffusion to the surface of the sample (which was expected) and an almost complete the lack of barium ions on the modified surface. The comparison of EDS and XPS analysis results, suggested that they penetrated the interior of the sample and embedded into the crystal structure in place of bismuth. The hypothesis is in good agreement with the results of X-ray diffraction -the volume of the unit cell had an insignificant increase. The changes in the ions concentration influenced, also in a distinct manner, the dielectric and relaxor properties as well as on the shape of temperature characteristic of thermal stimulated depolarization current observed in BBN ceramics.Keywords: ceramics, ferroelcectric relaxor, BBN, thermal treatment W niniejszym artykule są szeroko dyskutowane konsekwencje obróbki termicznej ceramiki BaBi 2 Nb 2 O 9 w warunkach wysokiej próżni (5×10 −11 bar) w temperaturze 1173K. Wyniki analizy XPS wykonane zarówno przed jak i po obróbce cieplnej ujawniły dyfuzję jonów bizmutu ku powierzchni próbki (co było oczekiwane) i prawie całkowity brak jonów baru na modyfikowanej powierzchni. Porównanie wyników analizy EDS i XPS sugeruje, że jony baru dyfundują do wnętrza próbki i najprawdopodobniej wbudowują się w strukturę krystaliczną w miejsca bizmutu. Ta hipoteza pozostaje w dobrej zgodności z wynikami badań rentgenowskich -objętość komórki elementarnej. Zmiany w koncentracji jonów wpływają również na właściwości dielektryczne oraz zachowania charakterystyczne dla ferroelektrycznych relaksorów, a także kształt charakterystyk temperaturowych prądów termicznie stymulowanej depolaryzacji (TSDC) obserwowanych w ceramice BBN.

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Crystal structure and ferroelectric properties ofABi2Ta2O

Cited by 386 publications

References 11 publications

Enhanced Dielectric and Ferroelectric Properties of Donor (W6+, Eu3+) Substituted SBT Ferroelectric Ceramics

Enhanced Dielectric and Ferroelectric Properties of Donor (W6+, Eu3+) Substituted SBT Ferroelectric Ceramics

Upconversion luminescence, ferroelectrics and piezoelectrics of Er Doped SrBi4Ti4O15

Influence Of Thermal Treatment On Relaxor Properties Of BaBi2Nb2O9 Ceramics

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