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- W3130370290 abstract "The two conventional aluminate precursor preparation methods are liquid-state co-precipitation and mechanical mixture, needing high temperature to fabricate thermionic cathodes for vacuum devices. Herein, we introduce the room temperature solid states (RTSS) approach to fabricate the precursors of barium calcium aluminates (BCA). For this, crystalline hydrates are used to prepare the precursor through mechanical grinding. The resulting product comprises of crystallized α-(Ba,Ca)CO 3 solid solution and Al 3+ -contained amorphous precipitants. After sintering at 1200 °C, the active phases of Ba 3 CaAl 2 O 7 and Ba 3 Al 2 O 6 were obtained. The direct current ( dc ) emission measurements in a close-space diode configuration revealed that the divergent current density ( J div ) of the test cathode reaches 7.2 A/cm 2 at 1130 °C B , which is comparable to that of the co-precipitation liquid phase method. Considering the virtue of an environmentally-friendly and low-temperature preparation approach, the preparation of aluminates using the RTSS technique has great potential for the fabrication of dispenser cathodes for vacuum devices. • Aluminate was successfully prepared by room temperature solid-state reaction. • Active phases were obtained in the product after sintering. • RTSS technique is promising because of the good current emission capability." @default.
- W3130370290 created "2021-03-01" @default.
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- W3130370290 date "2021-04-01" @default.
- W3130370290 modified "2023-09-25" @default.
- W3130370290 title "Structure and emission properties of barium calcium aluminates synthesized by room-temperature solid-state reaction approach" @default.
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- W3130370290 doi "https://doi.org/10.1016/j.matchemphys.2021.124418" @default.
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