Department of Materials Engineering, Tarbiat Modares University, Tehran, 14115-143, Iran.
Faculty of Electrical Engineering and Computer Science & MANSiD Research Center, Stefan cel Mare University, 13 Universitatii St., 720229, Suceava, Romania.
Dalton Trans. 2023 Apr 4;52(14):4462-4474. doi: 10.1039/d3dt00182b.
In this research, AgNbO ceramics were produced by two sintering methods: reaction sintering (RS) and conventional solid-state sintering (CSSS). The process was similar for both methods, except that in RS, AgO and NbO precursors were mixed, then formed into pellets, skipping the calcination step, and sintered at 1100 °C for 6 hours. Both prepared ceramics had the same perovskite crystal structure with an orthorhombic crystal system and and 2 space groups with similar lattice dynamic vibration modes at room temperature. The average grain size of the polycrystalline samples prepared by RS and CSSS was found to be ∼2.03 ± 0.77 and ∼1.85 ± 0.96 μm, respectively. The relative bulk densities of the ceramics produced by RS and CSSS were found to be ∼94.0 ± 1.8 and ∼96.5 ± 1.3%, respectively. Ceramics prepared by both methods showed antiferroelectric behavior, and reaction-sintered AgNbO ceramics exhibited lower energy loss density than CSSS samples. In addition, a recoverable energy storage density () of 3.1 J cm and higher energy storage efficiency () for RS samples were measured at 175 kV cm. Moreover, the values of 74.2% and 57.7% were measured for samples sintered by RS and CSSS, respectively. This energy storage efficiency is the highest ever reported for pure AgNbO ceramics. Furthermore, reaction-sintered samples showed good temperature stability for and in the 30-80 °C temperature range.
在这项研究中，采用两种烧结方法制备了 AgNbO 陶瓷：反应烧结（RS）和传统固相烧结（CSSS）。两种方法的工艺相似，不同之处在于 RS 中，AgO 和 NbO 前体混合，然后成型为压坯，跳过煅烧步骤，在 1100°C 下烧结 6 小时。两种方法制备的陶瓷都具有相同的钙钛矿晶体结构，属于正交晶系，和 2 个空间群，在室温下具有相似的晶格动力学振动模式。通过 RS 和 CSSS 制备的多晶样品的平均晶粒尺寸分别为∼2.03±0.77μm 和∼1.85±0.96μm。通过 RS 和 CSSS 制备的陶瓷的相对体密度分别为∼94.0±1.8%和∼96.5±1.3%。两种方法制备的陶瓷均表现出反铁电行为，反应烧结 AgNbO 陶瓷的能量损耗密度低于 CSSS 样品。此外，在 175 kV cm 下，RS 样品的可恢复储能密度（）为 3.1 J cm，储能效率（）为 。此外，RS 和 CSSS 烧结的样品的分别为 74.2%和 57.7%。这是迄今为止报道的纯 AgNbO 陶瓷的最高储能效率。此外，反应烧结样品在 30-80°C 温度范围内表现出良好的 和 温度稳定性。
