ABSTRACT

In this work, a modified sintering method, i.e. the three-step sintering technology, has been applied to fabricate the K_0.5Na_0.5NbO₃ ceramics. The impact of the detailed sintering conditions on the sinterability, dielectric and ferroelectric properties of K_0.5Na_0.5NbO₃ is systematically investigated. Attributed to the three-step sintering, the highest density of 4.07 g cm⁻³ can be observed, which is strongly improved compared with that of the single-step sintering technique and is increased up to 90% of the theoretical density. Furthermore, through the analysis on the tunability of the dielectric and ferroelectric performances, it is found that the maxima of permittivity and polarisation can be obtained in K_0.5Na_0.5NbO₃ sintering at 1160–1220–1120°C. These results illustrate that both the dielectric and ferroelectric behaviours can be effectively modulated through the simple modification of sintering technique, which would provide a novel route to achieve tunable electrical properties in ferroelectrics.

摘要

在这项工作中，一种改进的烧结方法，即三步烧结技术，已被应用于制备K _0.5 Na _0.5 NbO ₃陶瓷。系统地研究了详细的烧结条件对 K _0.5 Na _0.5 NbO _{3 的}可烧结性、介电性和铁电性的影响。归因于三步烧结，最高密度为4.07 g cm ^-3可以观察到，与单步烧结技术相比，这有很大的改进，并且增加了理论密度的 90%。此外，通过对介电和铁电性能可调性的分析，发现介电常数和极化的最大值可以在 K _0.5 Na _0.5 NbO ₃在 1160-1220-1120°C 下烧结获得。这些结果表明，通过对烧结技术的简单修改，可以有效地调节介电和铁电行为，这将为实现铁电体的可调电性能提供一条新途径。