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- W2764304842 abstract "The thermal emission of alkali metal ions from Al 30 -pillared montmorillonite in comparison with its natural form was studied by mass spectrometry in the temperature range 770–930 K. The measurements were carried out on a magnetic mass spectrometer MI-1201. For natural montmorillonite, the densities of the emission currents (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M1><mml:mrow><mml:mi>j</mml:mi></mml:mrow></mml:math>) decrease in the mass spectrum in the following sequence (T = 805 K, A/cm 2 ): K + (4.55 · 10 −14 ), Cs + (9.72 · 10 −15 ), Rb + (1.13 · 10 −15 ), Na + (1.75 · 10 −16 ), Li + (3.37 · 10 −17 ). For Al 30 -pillared montmorillonite, thermionic emission undergoes temperature-time changes. In the low-temperature section of the investigated range (770–805 K), the value of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M2><mml:mrow><mml:mi>j</mml:mi></mml:mrow></mml:math> increases substantially for all ions in comparison with natural montmorillonite (T = 805 K, A/cm 2 ): Cs + (6.47 · 10 −13 ), K + (9.44 · 10 −14 ), Na + (3.34 · 10 −15 ), Rb + (1.77 · 10 −15 ), and Li + (4.59 · 10 −16 ). A reversible anomaly is observed in the temperature range 805–832 K: with increasing temperature, the value of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M3><mml:mrow><mml:mi>j</mml:mi></mml:mrow></mml:math> of alkaline ions falls abruptly. This effect increases with increasing ionic radius of M + . After a long heating-up period, this anomaly disappears and the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M4><mml:mi mathvariant=normal>l</mml:mi><mml:mi mathvariant=normal>n</mml:mi><mml:mi>j</mml:mi><mml:mo>-</mml:mo><mml:mn fontstyle=italic>1</mml:mn><mml:mo>/</mml:mo><mml:mi>T</mml:mi></mml:math> dependence acquires a classical linear form. The results are interpreted from the point of view of the dependence of the efficiency of thermionic emission on the phase transformations of pillars." @default.
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- W2764304842 date "2017-01-01" @default.
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- W2764304842 title "Thermal Emission of Alkali Metal Ions from Al30-Pillared Montmorillonite Studied by Mass Spectrometric Method" @default.
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- W2764304842 doi "https://doi.org/10.1155/2017/4984151" @default.
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