Research on the nano-particle carbonates oxide cathode

Wang, Q F; Wang, X X; Luo, Jun

doi:10.1109/ivesc.2010.5644426

Cited by 1 publication

(3 citation statements)

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“…Li et al [9] reported that the nature of sol-gel combustion and the molar ratio of citric acid to metal nitrates (CA/MN) are the main causes of this difference. In addition, the position and intensity of two exothermic peaks shown by TG/DTA are changed by increasing the CA/MN molar ratio [10]. We can conclude that the existence of two exothermic peaks in DTA plot in Fig.…”

Section: Experimental Methodsmentioning

confidence: 59%

“…Generally, the thermal analysis of an exothermic reaction in a sol-gel combustion process shows one dramatic exothermic peak. A rapid reduction in weight during combustion shown in TG graph also occurs in one step [10], [12], [13]. It is also observed that there are two exothermic peaks in the thermal analysis of some combustion processes which are wider and weaker than the only peak in the common processes.…”

Section: Experimental Methodsmentioning

confidence: 77%

“…Studies have shown that using emissive materials with uniform composition and crystallite size at nanoscale improve emission performance of cathode. Wang et al [10] fabricated oxide cathode using nano emissive materials which is produced by liquid-gas method. They reported that the emission current density of oxide cathode used nano emissive materials is significantly higher than that of the conventional oxide cathode under the same condition.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of Nanocrystalline Electron Emissive Materials with Homogenous Composition in Nanoscale

Shiran¹,

Hadianfard²,

Shiezadeh³

2013

IJCEA

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Abstract-In this research, specific stoichiometric mixture of nanocrystalline barium carbonate, calcium carbonate, and aluminum oxide was fabricated by using the sol-gel combustion method. This mixture is used as emissive materials on impregnated cathodes which make up high power vacuum microwave tubes such as klystrons. Composition uniformity and particle size of emissive materials affect the electron emission properties of impregnated cathodes. In this study, dry gel and heat treated powder at 500 °C are investigated by thermal analysis (TG/DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX). The results show that dry gel combusts at 260 °C , and that during combustion transforms from an amorphous phase to a nanocrystalline phase. The average crystallite size of the powders which is calculated by Debye-Scherrer's method based on the XRD patterns is under 45 nm. The results of SEM and EDX of powder after heat treatment at 500 °C show that the particle size of powder is under 100 nm, and the chemical composition of emissive material is uniform at nanoscale.Index Terms-Dispenser cathode, emissive material, nanopowder, sol-gel combustion synthesis.

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Section: Experimental Methodsmentioning

confidence: 59%