This study investigated the impact of sintering temperature and resultant microstructure on the dielectric behavior and humidity sensing performance of NaCaTbCuTiO (NCTCTO). The pure NCTCTO phase was obtained. Relative density and grain size tended to increase with the sintering temperature. The porous NCTCTO exhibited remarkable humidity sensing performance with minimal hysteresis error (2 %) and rapid response and recovery times (1.5 min). The dense NCTCTO ceramic with a high relative density of about 99 %, demonstrated significant giant dielectric properties, with ε′∼8500 and low loss tangent (0.08). The dielectric behavior was interpreted using the internal barrier layer capacitor model. The increase in ε′ with humidity was ascribed to the absorption of HO molecules at the grain boundary, leading to increased interfacial polarization. This work delineates the critical influence of ceramic microstructure on the humidity sensing and giant dielectric properties of NCTCTO ceramics, paving the way for their application in advanced electronic devices.

中文翻译：

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优化烧结条件和微观结构以增强 Na1/3Ca1/3Tb1/3Cu3Ti4O12 陶瓷的介电和湿度传感性能

本研究研究了烧结温度和所得微观结构对 NaCaTbCuTiO (NCTCTO) 介电行为和湿度传感性能的影响。获得纯NCTCTO相。相对密度和晶粒尺寸随着烧结温度的升高而增加。多孔 NCTCTO 表现出卓越的湿度传感性能，具有最小的滞后误差 (2%) 和快速的响应和恢复时间 (1.5 分钟)。致密的NCTCTO陶瓷具有约99%的高相对密度，表现出显着的巨大介电性能，ε′∼8500和低损耗角正切（0.08）。使用内部势垒层电容器模型解释介电行为。 ε′随湿度的增加归因于晶界处 H2O 分子的吸收，导致界面极化增加。这项工作描述了陶瓷微观结构对 NCTCTO 陶瓷湿度传感和大介电性能的关键影响，为其在先进电子设备中的应用铺平了道路。