Influence Of Thermal Treatment On Relaxor Properties Of BaBi2Nb2O9 Ceramics

• Autorzy: Adamczyk M. , Pilch M. , Pawełczyk M.

Identyfikatory

DOI

10.1515/amm-2015-0012

Warianty tytułu

PL

Wpływ obróbki cieplnej na właściwości relaksorowe ceramiki BaBi2Nb2O9

• Języki publikacji: EN

Abstrakty

EN

In the hereby paper the implications of thermal modification of BaBi₂Nb₂O₉ 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.

PL

W niniejszym artykule są szeroko dyskutowane konsekwencje obróbki termicznej ceramiki BaBi₂Nb₂O₉ 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.

Słowa kluczowe

EN

ceramics; ferroelectric relaxor; BBN; thermal treatment

PL

ceramika; relaksory ferroelektryczne; ceramika BBN; obróbka termiczna

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2015
• Tom: Vol. 60, iss. 2A
• Strony: 545--550
• Opis fizyczny: Bibliogr. 33 poz., rys., tab., wykr.

Twórcy

autor

Adamczyk M.

• Department of Materials Science, University of Silesia, 2 Śnieżna Str., Sosnowiec, Poland

autor

Pilch M.

• Institute of Physics, University of Silesia, 4 Uniwersytecka Str., 40-007 Katowice, Poland

autor

Pawełczyk M.

• Katowice Institute of Information Technologies, 29 Mickiewicza Str., Katowice, Poland

Bibliografia

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Uwagi

EN

This work was supported by grant N N507504338 from the Ministry of Science and Higher Education in Poland.

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.