Direct determination of electrical conductivity of oxide cathodes

Gärtner, G.; Janiel, P.; Raasch, D.

doi:10.1016/s0169-4332(02)00251-9

Cited by 23 publications

(11 citation statements)

References 8 publications

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“…It is well known that Ba ion is reduced to free Ba at the interface by acquiring two electrons from the reducing elements or from Ni base metal. 16,17 It is then conceivable that the reduction process is faster than the electrolytic transport process. This latter reduction causes the accumulation of free Ba at the Ni interface.…”

Section: Resultsmentioning

confidence: 99%

Ba enrichment on the surface of oxide cathodes

Weon¹,

Dam²,

Park³

et al. 2003

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

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We investigated the chemical structure of actual oxide cathode emission materials using soft x-ray absorption spectroscopy. High-energy resolution spectra of the Ba 3d absorption edges reveal that the Ba content significantly increases on the surface layers of oxide cathodes down to several tens of nanometers in depth, after the cathode activation process. Furthermore, we will demonstrate that the excess Ba on the surface is only slightly driven by thermal energy, but rather it is induced by the voltage difference applied during cathode activation. This result suggests that the rate controlling step of the Ba enrichment on the surface during activation is the electrolytic transport of Ba ion from the bulk powder to the interface. We assume that the Ba enrichment on the surface originates from the depletion of barium in bulk powder by the electrolytic transport.

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Section: Resultsmentioning

confidence: 99%

Ba enrichment on the surface of oxide cathodes

Weon¹,

Dam²,

Park³

et al. 2003

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

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“…The conductivity of an activated (Ba,Sr)O coating is reported to be of the order of 10 cm [14], but the value for the new cermet oxide cathode plus with 2.5% Ni powder addition is increased to 10 cm at the operating temperature [15]. Fig.…”

Section: A Electrical Measurement and Conduction Propertiesmentioning

confidence: 99%

Resistivity Network and Structural Model of the Oxide Cathode for CRT Application

Hashim

Barratt

Hassan

et al. 2006

J. Display Technol.

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“…12 For a 2.5% Ni cermet, ᮀ el = 8⋅10 -3 (W-cm) -1 was directly determined under operating conditions at the (true) operating temperature of 1050 K in a planar diode configuration in UHV as described in Ref. 13.…”

Section: Background To Cermet Technologymentioning

confidence: 99%

Cermet cathodes: A new technology for CRT applications

Barratt¹,

Filkin²,

Bakker³

2004

J Soc Info Display

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Abstract— In this paper, we present results for a new type of cermet cathode (Oxide Plus) in a range of CRT tube types including wide‐screen 32‐in. and 34‐in. tubes together with 19‐in. computer‐monitor tubes. The results indicate that the cermet cathode exhibits good performance in all types of tube where previously oxide cathodes were not suitable and only Ba‐dispnser cathodes could be used. We also illustrate a new suspended cathode structure compatible with RCA‐type cathodes that could enable a wider adoption of this new technology.

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Direct determination of electrical conductivity of oxide cathodes

Cited by 23 publications

References 8 publications

Ba enrichment on the surface of oxide cathodes

Ba enrichment on the surface of oxide cathodes

Resistivity Network and Structural Model of the Oxide Cathode for CRT Application

Cermet cathodes: A new technology for CRT applications

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