Structure and properties of (Na0.5Bi0.5)ZrO3 (NBZ) lead-free perovskite compound

SCRIPTA MATERIALIA

卷:161

Article

Lelievre, Jerome¹  Josse, Michael²  Marchet, Pascal^1,3 

[1] Univ Limoges, IRCER, UMR 7315, F-87068 Limoges, France

[2] Univ Bordeaux, CNRS, ICMCB, UMR 5026, F-33600 Pessac, France

[3] CTTC, F-87068 Limoges, France

关键词: Lead-free perovskite;    Neutron diffraction;    Crystal structure;    Dielectric;    Relaxor;   

DOI  :  10.1016/j.scriptamat.2018.10.003

来源: Elsevier

【 摘 要 】

The structure of NBZ was studied by neutron diffraction. NBZ is monoclinic, (SG #11 P2(1)/m) a(m) = 5.696(8) angstrom, b(m) = 8.166(9) angstrom, c(m) = 5.790(4) angstrom and beta(m) = 89.97(4)degrees Being centrosymmetric, NBZ is neither piezoelectric nor ferroelectric. No phase transition was evidenced between 100 K and 923 K. NBZ presents a relaxor behavior below room temperature attributed to the mixed occupancy of the A-site by both Na+ and Bi3+ ions. The relative permittivity of NBZ appears noticeably stable (for 1 kHz 2.9% at 55 degrees C/218 K and +53% at 85 degrees C/358 K compared to the 25 degrees C/298 K value). NBZ appears thus as promising for the elaboration of capacitors requiring high thermal stability. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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