Relaxor properties of (Pb0·75Ba0·25)(Zr0·70Ti0·30)O3 ceramics

Ujma, Z.; Adamczyk, M.; Handerek, J.

doi:10.1016/s0955-2219(98)00153-8

Cited by 54 publications

(35 citation statements)

References 11 publications

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“…In the case of relaxor ceramics with finite electrical conductivity, the pyroelectric current has a complex character and was found to exhibit a broad anomaly in the temperature region of relaxor to paraelectric transition [23]. Recently Adamczyk et al [17] has reported the thermally induced depolarization current (TSDC) measurements of BaBai 2 Nb 2 O 9 ceramics in which the poling conditions were similar as that of the present study and an anomaly in the TSDC current was observed at the same temperature region as that of the present case.…”

Section: Anisotropy In Pyroelectric Coefficientmentioning

confidence: 99%

Dielectric and pyroelectric anisotropy in the melt-quenched barium bismuth niobate ceramics

Karthik

Varma

2007

J Electroceram

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BaBi 2 Nb 2 O 9 textured ceramics were fabricated via melt-quenching followed by high temperature (800-1000°C) sintering process. The resulting ceramics possessed a {00l} texture with the a-b plane of the grains oriented parallel to the major face of the quenched plate. The influence of the sintering temperature on the orientation factor (f) and microstructure was evaluated via X-ray powder diffraction (XRD) and Scanning electron microscopy (SEM). The orientation factor was found to increase with increase in the sintering temperature and reached a maximum value of 0.47 for the samples sintered at 1000°C for 10 h. Relative density and the grain-size of the ceramics were found to increase with increase in the sintering temperatures. The effect of texture on the dielectric and pyroelectric properties was evaluated. The measurements performed along the direction perpendicular to the pressing axis exhibited superior values than that of the direction parallel to the pressing axis. The observed anisotropy in the physical properties was attributed to the increased contribution from the highly polarizable a-b planes which are oriented in the direction perpendicular the pressing axis.

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Section: Anisotropy In Pyroelectric Coefficientmentioning

confidence: 99%

Dielectric and pyroelectric anisotropy in the melt-quenched barium bismuth niobate ceramics

Karthik

Varma

2007

J Electroceram

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“…What is more interesting is that PBZT 25/70/30 ceramics the effect completely disappears in the case of modification by heterovalent additives. The origin of the effect was widely discussed in the paper [11]. Some remaining FE domains (clusters) can be surrounded by the PE phase in the temperature range T f < T < T m and in a certain range of T > T m due to the mentioned differentiation in the local Curie temperatures.…”

Section: Resultsmentioning

confidence: 96%

“…The microstructure of pure PBZT ceramics was described in the previous paper [11]. The material had a good developed microstructure consisting of polyhedral-shaped grains with an average size in the order of 15 μm.…”

Section: Resultsmentioning

confidence: 99%

“…Further investigations revealed that heterovalent additives intensified the behaviour considerably [5,7,10]. Investigations described in this paper are focused on PBZT ceramics with Zr/Ti ratios of 70/30 and Ba content of 25 [11]. The influence on relaxor properties of heterovalent additives substituted Pb or Ba in the A-site of the crystal lattice as well as Nb in the B-site were described in detail in the series of papers published previously [12][13][14][15].…”

Section: Introductionmentioning

confidence: 91%

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Fabrication and dielectric properties of modified calcium (Pb0.75Ba0.25)(Zr0.7Ti0.3)O3 ceramics

et al. 2016

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Abstract. The aim of the present work is to report investigations concerning the influence of homovalent modificators on relaxor properties of PBZT 25/70/30 ceramics. The selection of the proper homovalent additive was very important. Literature reports as well as data taken from the periodic table indicated, that calcium ions substitute themselves for lead ions with high likelihood of occurrence. The investigations showed that the substitution significantly changed the microstructure of ceramics -with grains of calcium modified ceramics decreasing and density increasing. The XRD measurements indicate that the pure PBZT ceramics as well as calcium dopant were characterised by tetragonal structure with space group I4/mmm. Addition of calcium leads to a slight decrease in the lattice constant and crystal structure. The calcium modification also changes the dielectric properties. The temperature characteristic of the dielectric constant achieved a broadened maximum at temperature Tm, which decreases with increasing Ca content. The properties typical for ferroelectric relaxors weaken with increasing calcium dopant.

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“…Moreover the important role of space charge in screening polar nanoregions should not be forgot. The problem was widely described in papers [29,[30][31][32]. The one of ways of minimizing depolarization field energy associated with spontaneous polarization of nanoregions is to screen them by the space charge of the surrounding space.…”

Section: Dielectric and Thermally Stimulated Depolarization Currents mentioning

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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Relaxor properties of (Pb0·75Ba0·25)(Zr0·70Ti0·30)O3 ceramics

Cited by 54 publications

References 11 publications

Dielectric and pyroelectric anisotropy in the melt-quenched barium bismuth niobate ceramics

Dielectric and pyroelectric anisotropy in the melt-quenched barium bismuth niobate ceramics

Fabrication and dielectric properties of modified calcium (Pb0.75Ba0.25)(Zr0.7Ti0.3)O3 ceramics

Influence Of Thermal Treatment On Relaxor Properties Of BaBi2Nb2O9 Ceramics

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