水对纳米多孔MgAl2O4尖晶石结构和自由体积的影响

2022 IEEE 41st International Conference on Electronics and Nanotechnology (ELNANO) Pub Date : 2022-10-10 DOI:10.1109/ELNANO54667.2022.9927103

H. Klym, I. Hadzaman

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引用次数: 0

摘要

研究了在1300 $^{\circ}\ mathm {C}$温度下制备的湿敏MgAl2O4陶瓷在水的影响下2 h的结构性能和自由体积演化。结果表明，陶瓷具有发育良好的孔隙结构，具有三模态孔径分布、晶界和晶粒。结果表明，所研究的陶瓷中吸收的水分导致晶界附近的正电子被更密集的捕获，缺陷扩大。水在陶瓷内部结构中的存在导致纳米孔中自由体积的特定破碎和正电子离子在水中的衰变。

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Evolution of Structure and Free Volume in Nanoporous MgAl2O4 Spinel under Influence of Water

Structural properties and free-volume evolution were investigated in the humidity-sensitive MgAl2O4 ceramics prepared at 1300 $^{\circ}\mathrm{C}$ for 2 h under the influence of water. It is shown that ceramics has a well-developed structure of pores with trimodal pore size distribution, grain boundaries and grains. It is determined that absorbed water in studied ceramics result in more intensive trapping of positrons near grain boundaries with extended defects. The presence of water in the inner structure of ceramics leads to specific fragmentation of free volume in the nanopores and ortho-positronium decaying in water.

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2022 IEEE 41st International Conference on Electronics and Nanotechnology (ELNANO)

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