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Abstract The structure of NBZ was studied by neutron diffraction. NBZ is monoclinic, (SG #11 P2 1 /m) a m = 5.696(8) A, b m = 8.166(9) A, c m = 5.790(4) A and β m… Click to show full abstract
Abstract The structure of NBZ was studied by neutron diffraction. NBZ is monoclinic, (SG #11 P2 1 /m) a m = 5.696(8) A, b m = 8.166(9) A, c m = 5.790(4) A and β m = 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/218 K 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.
Journal Title: Scripta Materialia
Year Published: 2019
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