Surface migration and overgrowth of LaB6 on tungsten field emitter

Dharmadhikari, C. V.; Joag, Dilip S.; Kanitkar, P L

doi:10.1002/pssa.2210420249

Cited by 4 publications

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“…Recently, our studies on field emission microscopy of the LaB6/tUngSten system have shown preferential adsorption and overgrowth of La& on certain planes of a tungsten single crystal (Kanitkar et a2 1976, 1977. This paper reports further investigations on surface migration and thermal desorption of La& on tungsten using field emission microscopy.…”

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Adsorption, surface migration and thermal desorption of LaB₆on tungsten surface using field emission microscopy

Dharmadhikari

Joag

Kanitkar

1979

J. Phys. D: Appl. Phys.

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Investigations on the adsorption, surface migration and thermal desorption of LaB6 on the tungsten surface are made using as simple field emission microscope. The distribution of the absorbate over the surface, as the tip is heated progressively at higher temperatures, has been broadly classified in two stages corresponding to two different temperature ranges, 850-1100K and 1700-1950K. During the first stage, protrusions grow on (111) planes, with the estimated activation energy 1.0 eV and the pre-exponential factor 104 s-1. In the second stage, these protrusions are dispersed, resulting in a 'well-spread' pattern. Further heating in the same temperature range causes thermal desorption of the adsorbate, leaving the tungsten tip clean. The average activation energy for thermal desorption has been estimated to be 5.1 eV with a pre-exponential factor 1012 s-1. The results suggest that LaB6 evaporates as atomic La and B from the tungsten surface. The behaviour of the adsorbate over the surface is discussed in the light of the results.

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confidence: 74%

Adsorption, surface migration and thermal desorption of LaB₆on tungsten surface using field emission microscopy

Dharmadhikari

Joag

Kanitkar

1979

J. Phys. D: Appl. Phys.

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Rare Earth Compounds (Oxides, Sulfides, Silicides, Boron, …) as Thin Films and Thin Crystals Physico-Chemical Properties and Applications

Gasgnier¹

1989

Phys. Stat. Sol. (a)

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Reactions with Metal Compounds

Best¹,

Kühn²,

Kurtz³

et al. 1986

W Tungsten

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Surface migration and overgrowth of LaB6 on tungsten field emitter

Cited by 4 publications

References 8 publications

Adsorption, surface migration and thermal desorption of LaB₆on tungsten surface using field emission microscopy

Adsorption, surface migration and thermal desorption of LaB₆on tungsten surface using field emission microscopy

Rare Earth Compounds (Oxides, Sulfides, Silicides, Boron, …) as Thin Films and Thin Crystals Physico-Chemical Properties and Applications

Reactions with Metal Compounds

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Surface migration and overgrowth of LaB6 on tungsten field emitter

Cited by 4 publications

References 8 publications

Adsorption, surface migration and thermal desorption of LaB6on tungsten surface using field emission microscopy

Adsorption, surface migration and thermal desorption of LaB6on tungsten surface using field emission microscopy

Rare Earth Compounds (Oxides, Sulfides, Silicides, Boron, …) as Thin Films and Thin Crystals Physico-Chemical Properties and Applications

Reactions with Metal Compounds

Contact Info

Product

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Adsorption, surface migration and thermal desorption of LaB₆on tungsten surface using field emission microscopy

Adsorption, surface migration and thermal desorption of LaB₆on tungsten surface using field emission microscopy