Abstract
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 Bi3+ 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.
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