Effect of MnO2 Addition on the Electrical Properties of PNZST Ceramics

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• 作者：Yangxi Yan (1)
  Hongliang He (2)
  Yujun Feng (1)
  
• 关键词：Piezoelectric properties ; ferroelectric ; internal bias field
• 刊名：Journal of Electronic Materials
• 出版年：2014
• 出版时间：May 2014
• 年：2014
• 卷：43
• 期：5
• 页码：1460-1465
• 全文大小：1,022 KB
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• 作者单位：Yangxi Yan (1)
  Hongliang He (2)
  Yujun Feng (1)
  
  1. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education and International Center for Dielectric Research, Xi’an Jiaotong University, Xi’an, 710049, China
  2. National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP, Mianyang, 621900, China
  
• ISSN：1543-186X

文摘

(Pb0.99Nb0.02)[(Zr0.70Sn0.30) x Ti1?em class="a-plus-plus">x ]0.98O3 (PNZST) piezoelectric ceramics of pure perovskite structure were prepared by a conventional ceramic fabrication method, where x?=?0.48-.56. When x?=?0.52, the ceramics exhibit a high piezoelectric coefficient (d 33?～?90), but the mechanical quality factor (Q m) is only 72. To increase the Q m and not dramatically lower the d 33, MnO2 was chosen as the additive. The effects of adding MnO2 on the sinterability, structure, and electrical properties of PNZST ceramics were investigated in detail. With a small addition of MnO2 (?.6?wt.%), the Mn ions are homogeneously dissolved in the PNZST ceramic, leading to full densification when sintered at 1,300?°C. However, further addition of MnO2 prevents densification, causing a high porosity and small grain size. The doping of MnO2 transforms the phase structure from tetragonal to rhombohedral. The addition of MnO2 up to a maximum of 0.6?wt.% remarkably improves the mechanical quality factor (Q m) of PNZST ceramics, simultaneously as well as maintaining a high d 33 and k p. PNZST with 0.6?wt.% MnO2 exhibits excellent electrical properties with piezoelectric coefficient d 33?=?392 pC/N, electromechanical coupling factor k p?=?0.60, mechanical quality factor Q m?=?1,050, dielectric constant ε r?=?1,232, dielectric dissipation tanδ?=?0.0058, and Curie temperature T C?=?300?°C.