LELIEVRE, Jerome; JOSSE, Michaël; MARCHET, Pascal

doi:10.1016/j.scriptamat.2018.10.003

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LELIEVRE, Jerome
IRCER - Axe 3 : organisation structurale multiéchelle des matériaux [IRCER-AXE3]

JOSSE, Michaël
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

MARCHET, Pascal
Axe 3 : organisation structurale multiéchelle des matériaux

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Scripta Materialia. 2019-03, vol. 161, p. 13-17

Elsevier

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The structure of NBZ was studied by neutron diffraction. NBZ is monoclinic, (SG #11 P21/m) am = 5.696(8) Å, bm = 8.166(9) Å, cm = 5.790(4) Å and βm = 89.97(4)°. 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 Bi 3+ ions. The relative permittivity of NBZ appears noticeably stable (for 1 kHz-2.9% at-55 °C / 218K and +5.3% at 85 °C / 358 K compared to the 25 °C / 298 K value). NBZ appears thus as promising for the elaboration of capacitors requiring high thermal stability< Leer menos

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Lead-free perovskite

Neutron diffraction

Crystal structure

Dielectric Relaxor

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

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