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• W4289544265 abstract "An alkali metal dispenser is the core device for vacuum evaporation in producing multialkali photocathodes. However, the reaction kinetic of alkali metal chromate being reduced by a Zr-Al alloy, which is the most commonly used alkali metal dispenser, has not been reported. In this work, we made composite particles of Zr-Al 16 wt. % powders with Na2CrO4 by a method of liquid precipitation. Through thermal analysis of its reaction, we found that the difference of a Zr-Al particle size would affect the reaction starting temperature but would not make a significant difference on the apparent activation energy. Through the comparison method by Sharp, we found that the 3D Avrami–Erofeev equation fits for this reaction and established a reaction degree-temperature function, and the reaction kinetic was further verified by a vacuum evaporation experiment. Through an in situ XRD measurement, the chemical change during an Na dispenser’s working process is found to be Na2CrO4 → Na2CrO4, Na2CrO3, and Cr2O3 coexist → NaCrO2. This work may serve as a reference for the design of alkali metal dispensers and help to improve the control precision for an evaporation process." @default.
• W4289544265 created "2022-08-03" @default.
• W4289544265 creator A5043537468 @default.
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• W4289544265 date "2022-08-03" @default.
• W4289544265 modified "2023-09-29" @default.
• W4289544265 title "Zr-Al 16 wt. % and Na₂CrO₄ composite particles used for Na dispenser and its reaction kinetic" @default.
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• W4289544265 doi "https://doi.org/10.1116/6.0001863" @default.
• W4289544265 hasPublicationYear "2022" @default.
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