Experimental Verification of Theoretical Models Simulating the Temperature Increase in EPMA of Glass

Hulı́nský, Václav; Jurek, K.; Gedeon, Ondrej

doi:10.1007/978-3-7091-6555-3_24

Cited by 7 publications

(8 citation statements)

References 13 publications

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“…The diameter was measured at the fluorescent screen using a built in optical microscope. At these irradiating conditions the increase of temperature is negligible [28]. Glass samples were irradiates with a series of electron doses 1.1-190 kC/m 2 , each dose was continuous and independent, i.e.…”

Section: Methodsmentioning

confidence: 99%

Mixed-alkali effect in sodium–potassium glasses irradiated with electrons

Gedeon

Jurek

Drbohlav

2010

Journal of Non-Crystalline Solids

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Section: Methodsmentioning

confidence: 99%

Mixed-alkali effect in sodium–potassium glasses irradiated with electrons

Gedeon

Jurek

Drbohlav

2010

Journal of Non-Crystalline Solids

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“…The following glasses were prepared Na10 (10%Na 2 O 90%SiO 2 ), Na15 (15%Na 2 13.2%CaO) all in molar concentrations. Blocks of glasses were polished and coated by a 30-nm carbon layer.…”

Section: Methodsmentioning

confidence: 99%

“…Maximum temperatures inside the irradiated volume were calculated according to an algorithm published in Ref. [13] and were taken to be constant in the irradiated volume for sake of simplicity.…”

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confidence: 99%

Microanalysis of Glass Containing Alkali Ions

2000

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The common problems connected with alkali ion migration during EPMA were studied on glasses containing nearly all possible alkali ions (Na, K, Rb, Cs). Binary silica glasses were prepared by melting from a very pure batch in Pt crucible. The glasses were carefully polished using alcohol to prevent surface corrosion by water and they were stored in vacuum. The specimens were coated with carbon layers approximately 30-nm thick and exposed to a 50-keV electron beam of 100 mm diameter. It was found that all alkali ions migrate under the electron beam, but the rate of the migration depends on the current density. The decay curves (characteristic X-ray intensity versus time) are similar in shape in all cases. The decay curve shows two transport regimes, the ®rst being linear-like, the second being the exponentiallike. The ®rst transport regime busts into the rapid alkali migration after a time known as the incubation period. The period is in general longer for the largeralkali ions size. It was found that even large rubidium and caesium ions migrate inside the glass with the same mechanism as sodium and potassium ions. While for K, Rb, and Cs ions the incubation periods were observed under the suitable experimental conditions, binary glass containing Na exhibits no observable incubation period. Except for the binary Na 2 O SiO 2 glass, the suitable experimental conditions for reliable quantitative EPMA can be found.

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“…The study of dynamic of such amorphous volume creation needs use of time resolved experiment possibly in short range of time with detection of SiODC luminescence, which is not yet available for us now. The thermal regime of e-beam irradiation was studied in many papers by mathematical modeling [10]. Main result is insignificant increase of the temperature of irradiated volume because of efficient thermal conductivity.…”

Section: Discussionmentioning

confidence: 99%