Pyroelectric materials have been widely studied because of their important role in infrared detectors, sensors, thermal imaging, and other applications, among which, lead-based ceramics are extensively adopted. However, the environmental problems caused by lead-based compounds in production and processing are becoming increasingly serious. Meanwhile, the surface mounting technology is extensively employed in the electronics industry for device miniaturization and integration. However, due to its high processing temperature (∼260 °C), it makes most pyroelectric ceramic materials unsuitable for this process. Therefore, it is of great significance to develop novel high-performance lead-free pyroelectric ceramics with high depolarization temperature (>260 °C). In this work, we report the Na0.995Ag0.005NbO3-0.1%Mn (NANM) pyroelectric ceramics. The antiferroelectric–ferroelectric phase transition field and coercive field of NaNbO3 ceramics were reduced by the introduction of AgNbO3 and Mn, making it easier to induce the ferroelectric phase and realize poling in NANM ceramics. The NANM ceramics exhibited an excellent pyroelectric coefficient of 2.55 × 10−4 C m−2 K−1 and figures of merit as Fi = 0.93 × 10−10 m/V, Fv = 6.46 × 10−2 m2/C, and Fd = 2.92 × 10−5 Pa−1/2 at room temperature. More importantly, a high depolarization temperature of 280 °C was achieved, ensuring the ability to withstand high temperature during production and operation. The NANM ceramics with excellent pyroelectric properties and high depolarization temperature are expected to be a promising lead-free candidate for uncooled infrared detector applications.

中文翻译：

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在 NaNbO3 基陶瓷中同时实现卓越的热释电性能和超高的去极化温度


热释电材料因其在红外探测器、传感器、热成像和其他应用中的重要作用而被广泛研究，其中，铅基陶瓷被广泛采用。然而，铅基化合物在生产和加工中造成的环境问题正变得越来越严重。同时，表面贴装技术在电子行业中被广泛用于器件的小型化和集成化。然而，由于其高加工温度 （∼260 °C），它使大多数热释电陶瓷材料不适合这种工艺。因此，开发具有高去极化温度 （>260 °C） 的新型高性能无铅热释电陶瓷具有重要意义。在这项工作中，我们报道了 Na0.995Ag0.005NbO3-0.1%Mn （NANM） 热释电陶瓷。AgNbO3 和 Mn 的引入降低了 NaNbO3 陶瓷的反铁电-铁电相变场和矫顽力场，使其更容易在 NANM 陶瓷中感应出铁电相并实现极化。NANM 陶瓷在室温下表现出 2.55 × 10-4 C m-2 K-1 的优异热释电系数，品质因数为 Fi = 0.93 × 10-10 m/V，Fv = 6.46 × 10-2 m2/C，Fd = 2.92 × 10-5 Pa-1/2。更重要的是，实现了 280 °C 的高去极化温度，保证了生产和运行过程中承受高温的能力。具有优异热释电性能和高去极化温度的 NANM 陶瓷有望成为非制冷红外探测器应用的无铅候选者。