Effect of Microwave Processing on the Crystallization and Energy Density of BaO-Na2O-Nb2O5-SiO2-B2O3 Glass-Ceramics
Effect of Microwave Processing on the Crystallization and Energy Density of BaO-Na2O-Nb2O5-SiO2-B2O3 Glass-Ceramics
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DOI：
10.1111/jace.14485
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发表时间：
2017
影响因子：
3.9
通讯作者：
C. Davis;Andre L. Pertuit;J. Nino
中科院分区：
文献类型：
--
作者：
C. Davis;Andre L. Pertuit;J. Nino
采用常规加热和微波复合加热的方法，通过控制晶化法成功地合成了钡酸钠微晶玻璃。研究了不同温度和条件下微晶玻璃的介电性能。研究发现，介电常数随着结晶温度的升高而增加，从750°C到1000°C，并且高于900°C的晶相的生长对于提高材料的相对介电常数和整体储能性能是必不可少的。对于在1000°C下常规结晶的材料，在100 kV/cm的最大场下，放电能量密度为0.13 J/cm 3，发现最高的能量储存。发现快速微波加热不会显著增强介电性能，并且发现铁电晶体的粗化对于更高的能量存储是关键的。
Barium sodium niobate (BNN) glass-ceramics were successfully synthesized through a controlled crystallization method, using both a conventional and a microwave hybrid heating process. The dielectric properties of glass-ceramics devitrified at different temperatures and conditions were measured. It was found that the dielectric constant increased with higher crystallization temperature, from 750°C to 1000°C, and that growth of the crystalline phase above 900°C was essential to enhancing the relative permittivity and overall energy storage properties of the material. The highest energy storage was found for materials crystallized conventionally at 1000°C with a discharge energy density of 0.13 J/cm3 at a maximum field of 100 kV/cm. Rapid microwave heating was found to not give significant enhancement in dielectric properties, and coarsening of the ferroelectric crystals was found to be critical for higher energy storage.