Addition of CeO2 impurity and emission characteristics of M-type cathodes

Ping Lu; Chunying Shen; Tai Qiu

Addition of CeO₂ impurity and emission characteristics of M-type cathodes

Ping Lu, Chunying Shen, Tai Qiu

College of Materials Science and Engineering

Nanjing Tech University

Research output: Contribution to journal › Article › peer-review

Abstract

The novel M-type cathode material has been successfully developed by mechanically adding CeO₂ impurity into the tungsten matrix. Its microstructures and its emission properties were characterized with scanning electron microscopy (SEM), X-ray photoelectron spectroscopy(XPS), mercury intrusion poremeasurement (MIP) and water cooled anode diode. The results show that doping of rare-earth CeO₂ significantly improves the characteristics of the cathode, and in normal working temperature of 1050 °C, the CeO₂ doped cathode outperforms its counterpart-the conventional barium tungsten cathode. For instance, the CeO₂ doping results in a more uniform distribution of pores, with an average diameter of 2.08 μm. Its continuous and pulsed emission current densities are found to be 6.33 A·cm^-2and 17.48 A·cm^-2, respectively; and its effective work function is 1.86 eV. Besides, CeO₂ doping promotes the diffusion and surface absorption of Ba, leading to higher Ba3d peak.

Original language	English
Pages (from-to)	295-298
Number of pages	4
Journal	Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology
Volume	28
Issue number	4
State	Published - Aug 2008

Keywords

CeO Dispenser cathode
Emission current density
Rare earths

Cite this

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title = "Addition of CeO2 impurity and emission characteristics of M-type cathodes",

abstract = "The novel M-type cathode material has been successfully developed by mechanically adding CeO2 impurity into the tungsten matrix. Its microstructures and its emission properties were characterized with scanning electron microscopy (SEM), X-ray photoelectron spectroscopy(XPS), mercury intrusion poremeasurement (MIP) and water cooled anode diode. The results show that doping of rare-earth CeO2 significantly improves the characteristics of the cathode, and in normal working temperature of 1050 °C, the CeO2 doped cathode outperforms its counterpart-the conventional barium tungsten cathode. For instance, the CeO2 doping results in a more uniform distribution of pores, with an average diameter of 2.08 μm. Its continuous and pulsed emission current densities are found to be 6.33 A·cm-2and 17.48 A·cm-2, respectively; and its effective work function is 1.86 eV. Besides, CeO2 doping promotes the diffusion and surface absorption of Ba, leading to higher Ba3d peak.",

keywords = "CeO Dispenser cathode, Emission current density, Rare earths",

author = "Ping Lu and Chunying Shen and Tai Qiu",

year = "2008",

month = aug,

language = "英语",

volume = "28",

pages = "295--298",

journal = "Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology",

issn = "1672-7126",

publisher = "Chinese Vacuum Society",

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T1 - Addition of CeO2 impurity and emission characteristics of M-type cathodes

AU - Lu, Ping

AU - Shen, Chunying

AU - Qiu, Tai

PY - 2008/8

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N2 - The novel M-type cathode material has been successfully developed by mechanically adding CeO2 impurity into the tungsten matrix. Its microstructures and its emission properties were characterized with scanning electron microscopy (SEM), X-ray photoelectron spectroscopy(XPS), mercury intrusion poremeasurement (MIP) and water cooled anode diode. The results show that doping of rare-earth CeO2 significantly improves the characteristics of the cathode, and in normal working temperature of 1050 °C, the CeO2 doped cathode outperforms its counterpart-the conventional barium tungsten cathode. For instance, the CeO2 doping results in a more uniform distribution of pores, with an average diameter of 2.08 μm. Its continuous and pulsed emission current densities are found to be 6.33 A·cm-2and 17.48 A·cm-2, respectively; and its effective work function is 1.86 eV. Besides, CeO2 doping promotes the diffusion and surface absorption of Ba, leading to higher Ba3d peak.

AB - The novel M-type cathode material has been successfully developed by mechanically adding CeO2 impurity into the tungsten matrix. Its microstructures and its emission properties were characterized with scanning electron microscopy (SEM), X-ray photoelectron spectroscopy(XPS), mercury intrusion poremeasurement (MIP) and water cooled anode diode. The results show that doping of rare-earth CeO2 significantly improves the characteristics of the cathode, and in normal working temperature of 1050 °C, the CeO2 doped cathode outperforms its counterpart-the conventional barium tungsten cathode. For instance, the CeO2 doping results in a more uniform distribution of pores, with an average diameter of 2.08 μm. Its continuous and pulsed emission current densities are found to be 6.33 A·cm-2and 17.48 A·cm-2, respectively; and its effective work function is 1.86 eV. Besides, CeO2 doping promotes the diffusion and surface absorption of Ba, leading to higher Ba3d peak.

KW - CeO Dispenser cathode

KW - Emission current density

KW - Rare earths

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Addition of CeO₂ impurity and emission characteristics of M-type cathodes

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