Degradation of ferroelectric SrBi2Ta2O9 materials under reducing conditions and their reaction with Pt electrodes

Shimakawa, Yuichi; Kubo, Yoshimi

doi:10.1063/1.125167

Cited by 34 publications

(16 citation statements)

References 9 publications

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“…[1][2][3][4][5] In our previous letter, we first revealed SBT degradation under reducing conditions by using bulk ceramic samples. 6 SBT decomposes into Bi metal and Sr-Ta-oxide phase͑s͒ through oxygen dissociation. In the presence of Pt, which is usually used as an electrode, Bi-Pt alloy is produced.…”

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confidence: 99%

Degradation of ferroelectric Pb(Zr, Ti)O3 under reducing conditions

Shimakawa

Kubo

2000

Applied Physics Letters

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The degradation mechanisms of Pb(Zr, Ti)O3 (PZT) under reducing conditions were investigated. Although no apparent changes were seen from the results of thermogravimetric and x-ray diffraction measurements after H2 annealing at typical process temperatures, the PZT material had changed: The sample appearance changed from white to black. A small amount of PZT (less than 0.3% even after 4% H2 annealing at 550 °C) decomposed into Pb in the reducing atmosphere. This, however, was too little to cause all of the change in the sample appearance. Systematic changes in the lattice constants and the black color of the sample strongly suggest that oxygen defects were introduced into the PZT during H2 annealing. Oxygen defects would produce a donor level within the PZT band gap, which would account for the change in color, and would increase leakage current in capacitors. We have also found that PbZrO3 decomposed through oxygen dissociation more easily than PbTiO3. Oxygen atoms in PbZrO3 are weakly bonded to Zr compared to Ti–O bonds in PbTiO3 due to a significant antibonding component in the hybridized orbitals.

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confidence: 99%

Degradation of ferroelectric Pb(Zr, Ti)O3 under reducing conditions

Shimakawa

Kubo

2000

Applied Physics Letters

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“…However the XPS measurements revealed two competitive processes. Namely thermal treatment in the reducing atmosphere caused a reduction of Bi 2 O 3 into Bi metal [19], was as expected. The bismuth ions diffused from the interior of the sample to the surface and remained there.…”

Section: Xps Measurementsmentioning

confidence: 65%

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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“…Besides, we find a broad background to indicate the production of some non-crystalline materials. Here, it should be noticed that r = 0.045 of the sample F is almost equal to the final value of r = 0.048 obtained from the annealing condition of a 4% H 2 atmosphere, T ∼ 600 K and t ∼ 500 min [10], and that this state corresponds just to loss of three oxygen atoms per one molecular unit of SBT. Therefore, we may suppose the simple reaction SrBi 2 TaO 9 + 3H 2 → 2Bi + SrTaO 6 + 3H 2 O as has been pointed out previously [10].…”

Section: Tablementioning

confidence: 89%

Deterioration Process of Strontium Bismuth Tantalate Induced by Hydrogen Reduction

et al. 2006

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We studied the effect of annealing in a hydrogen gas on the crystal structure of strontium bismuth tantalate (SBT) by means of X-ray diffraction measurements. The hydrogen reduction happens mainly in bismuth oxide layers followed by the decomposition of pseudo-perovskite layers. With increasing the annealing time and/or temperature, new crystalline products such as bismuth, strontium tantalate, and bismuth oxide, and an unidentified crystal are observed along with non-crystalline materials. Decomposition of SBT and recrystallization of the decomposed materials occur even from the initial stage of the hydrogen reduction process. Keywords

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Degradation of ferroelectric SrBi2Ta2O9 materials under reducing conditions and their reaction with Pt electrodes

Cited by 34 publications

References 9 publications

Degradation of ferroelectric Pb(Zr, Ti)O3 under reducing conditions

Degradation of ferroelectric Pb(Zr, Ti)O3 under reducing conditions

Influence Of Thermal Treatment On Relaxor Properties Of BaBi2Nb2O9 Ceramics

Deterioration Process of Strontium Bismuth Tantalate Induced by Hydrogen Reduction

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