Nanoporous characterization of modified humidity-sensitive MgO-Al2O3 ceramics by positron annihilation lifetime spectroscopy method

被引:6
|
作者
Klym, H. [1 ]
Ingram, A. [2 ]
Hadzaman, I. [3 ]
Karbovnyk, I. [4 ]
Vasylchyshyn, I. [1 ]
Popov, A. I. [5 ]
机构
[1] Lviv Polytech Natl Univ, 12 Bandera St, UA-79646 Lvov, Ukraine
[2] Opole Univ Technol, 75 Ozimska St, PL-45370 Opole, Poland
[3] Drohobych Ivan Franko State Pedag Univ, 24 I Franko St, UA-82100 Drogobych, Ukraine
[4] Ivan Franko Natl Univ Lviv, 107 Tarnavskogo St, UA-79017 Lvov, Ukraine
[5] Univ Latvia, Inst Solid State Phys, 8 Kengaraga St, LV-1063 Riga, Latvia
来源
FUNCTIONAL MATERIALS AND NANOTECHNOLOGIES (FM&NT 2018) | 2019年 / 503卷
关键词
PORE STRUCTURE; FREE-VOLUME; SENSORS;
D O I
10.1088/1757-899X/503/1/012019
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Investigation of nanopores in the humidity-sensitive MgO-Al2O3 ceramics modified at 1100 degrees C for 2 hours was performed using positron annihilation lifetime spectroscopy method. Lifetimes of the third and fourth components of positron annihilation lifetime spectra obtained by four-component fitting procedure were used for calculation of nanopores radii. Transformation in free volumes was studied in ceramics after drying and exposure to water vapor. It is established that the lifetime of the third component decreases and the intensity of this component increases in ceramics exposed to water vapor reflecting ortho-positronium decay in nanopores simultaneously with annihilation in water bubbles. The characteristics of the fourth component (lifetime and intensity) decrease in ceramics exposed to water vapor reflecting ortho-positronium trapping in free-water volume of nanopores. Final drying of the MgO-Al2O3 ceramics results in returning of ortho-positronium lifetimes and intensities to the initial values confirming good desorption of water from nanopores of ceramics.
引用
收藏
页数:6
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