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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Correlation between nanostructural and electrical properties of barium titanate-based glass-ceramic nano-composites
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Correlation between nanostructural and electrical properties of barium titanate-based glass-ceramic nano-composites

机译：钛酸钡基玻璃陶瓷纳米复合材料的纳米结构与电性能的相关性

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摘要

Glasses in the system BaTiO_3-V_2O_5-Bi_2O_3 have been transformed into glass-ceramic nano-composites by annealing at crystallization temperature T_(cr) determined from DSC thermograms. After annealing they consist of small crystallites embedded in glassy matrix. The crystallization temperature T_(cr) increases with increasing BaTiO_3 content. XRD and TEM of the glass-ceramic nano-composites show that nanocrystals were embedded in the glassy matrix with an average grain size of 25 nm. The resulting materials exhibit much higher electrical conductivity than the initial glasses. It was postulated that the major role in the conductivity enhancement of these nanomaterials is played by the developed interfacial regions between crystalline and amorphous phases, in which the concentration of V~(4+)-V~(5+) pairs responsible for electron hopping, has higher than values that inside the glassy matrix.
机译：BaTiO_3-V_2O_5-Bi_2O_3体系中的玻璃已通过在DSC差示热分析图确定的结晶温度T_（cr）进行退火而转变为玻璃陶瓷纳米复合材料。退火后，它们由嵌入玻璃状基质中的小晶体组成。结晶温度T_（cr）随着BaTiO_3含量的增加而增加。玻璃陶瓷纳米复合材料的XRD和TEM结果表明，纳米晶体嵌入玻璃态基质中，平均晶粒尺寸为25 nm。所得材料显示出比初始玻璃高得多的电导率。据推测，在这些纳米材料的电导率增强中的主要作用是由结晶相和非晶相之间发达的界面区域发挥作用的，其中V〜（4 +）-V〜（5+）对的浓度负责电子跳跃，其值高于玻矩阵内部的值。

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