Thermal Depolarization in the High‐Temperature Ternary Piezoelectric System xPbTiO3–yBiScO3–zBi(Ni1/2Ti1/2)O3. Issue 2 (13th October 2014)

• Record Type: Journal Article
• Authors: Ansell, Troy Y.; Cann, David P.; Sapper, Eva; Rödel, Jürgen; Zhang, S.
• Is Part Of: Journal of the American Ceramic Society. Volume 98:Issue 2(2015)
• Page Start: 455
• Page End: 463
• Publication Date: 2014-10-13
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.13268
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace13268-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>In the high‐temperature ternary perovskite piezoelectric system <italic>x</italic>PbTiO₃–<italic>y</italic>BiScO₃–<italic>z</italic>Bi(Ni_1/2, Ti_1/2)O₃ (PT–BS–BNiT), the addition of bismuth to the A site and nickel to the B site leads to compositions that exhibit diffuse relaxor‐like behavior. For these, depolarization temperature, not Curie point, is the critical value of temperature. Depolarization temperature (<italic>T</italic>_d) is defined as the temperature at which the steepest loss in polarization occurs. This temperature is observed in poled materials through two different methods: loss tangent measurements and <italic>in situ d</italic>₃₃. Across the ternary system, multiple dielectric anomalies occurred which was observed in dielectric tests where the dielectric peak broadens and becomes frequency dependent as BNiT content increased. For different compositions, the value of <italic>T</italic>_d ranged between 275°C–375°C. Values for the piezoelectric coefficient increased with temperature up to <italic>d</italic>₃₃ = 1000 pC/N during <italic>in situ d</italic>₃₃. High temperature (up to 190°C) and high field (up to 40 kV/cm) were also applied to test ferroelectric properties in these regimes.</p> </abstract>