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Микроструктурные и электрические характеристики пьезокерамики (Bi0,5Na0,5)TiO3 – ZnO

Алима Мебрек, Скандер Бухезар, Афеф Аззи, Радуан Драй

Аннотация


Исследованы керамические материалы BNT – xZnO системы Bi0,5Na0,5TiO3 – xZnO с 0; 2,0 % (масс.) ZnO, полученные классическим методом твердофазной реакции. Исходные порошки (Bi2O3, TiO2 и Na2CO3 ) в сочетании с добавкой ZnO измельчали в течение 10 ч; прокаливали при 850 °C, 3 ч; прессовали и затем спекали в течение 3 ч при 1050 °C. Морфологию и микроструктуру спеченных гранул исследовали с помощью дифракции рентгеновских лучей, сканирующей электронной микроскопии и гелиевого пикнометра. Установлено образование в материалах твердого раствора (Bi0,5Na0,5)TiO3 со структурой чистого перовскита и шпинели Zn2TiO4. После спекания при 1050 °C пьезокоэффициент d33 для керамики BNT составил 155 пКл/Н, а для BNT с 2,0 масc. % ZnO — 181 пКл/Н. Добавление ZnO в керамику BNT способствует повышению плотности материала и позволяет получить электропроводность 7,48 ґ 108 Ом Ч см.

Ключевые слова


керамика (Bi0,5Na0,5)TiO3 (BNT); оксид цинка ZnO; пьезокерамика; микроструктура; электропроводность.

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Литература


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DOI: https://doi.org/10.30906/mitom.2023.2.56-62

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