phase transition and electrical properties of new lead-free (na0.5k0.5)nbo3–ba(ti0.95hf0.05)o3 solid solution ceramics

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ID: 136851
2011
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Abstract
New lead-free piezoelectric ceramics (1-x)(Na0.5K0.5)NbO3–xBa(Ti0.95Hf0.05)O3 (NKN-xBTH) doped with 0.8 mol.% CuO have been successfully fabricated by traditional solid state sintering. Owing to complex atomic occupation at A-sites and B-sites, the ferroelectric phase transition of NKN becomes more and more diffuse with increasing BTH content. On the other hand, it was found that the addition of a small amount of BTH shifts an orthorhombic-tetragonal polymorphic phase transformation of pure NKN composition downwards to room temperature. The two-phase transition zone was identified approximately at 0.04 < x < 0.06 and the ceramic with x = 0.06 possesses obviously enhanced electrical properties: d33 = 185 pC/N, kp = 0.38, ε33 T = 1690, Qm = 108 and Tc = 267 °C, compared to pure NKN.
Новая бессвинцовая пьезоэлектрическая керамика (1-x)(Na0.5K0.5)NbO3–xBa(Ti0.95Hf0.05)O3 (NKN-xBTH), легированная 0,8 мол. % CuO, была успешно получена методом традиционного твердофазного спекания. Из-за сложного заселения A- и B-позиций атомами сегнетоэлектрический фазовый переход NKN становится все более размытым по мере увеличения содержания BTH. С другой стороны, было обнаружено, что добавление небольшого количества BTH смещает орторомбически-тетрагональный полиморфный фазовый переход чистого состава NKN вниз, к комнатной температуре. Область двухфазного перехода была определена приблизительно в диапазоне 0,04 < x < 0,06, а керамика с x = 0,06 обладает заметно улучшенными электрическими свойствами по сравнению с чистым NKN: d33 = 185 пКл/Н, kp = 0,38, ε33 T = 1690, Qm = 108 и Tc = 267 °C.
Reference Key
fu2011ceramics-siliktyphase Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Jian FU, YI Liu, Shi SU, Danya LV, Ruzhong Zuo
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Journal european journal of organic chemistry
Year 2011
DOI
DOI not found
URL
http://www.ceramics-silikaty.cz/2011/pdf/2011_02_101.pdf
Keywords
glass Ceramics

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