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  • 产品名称：Denka LaB6 Filaments

  • 产品型号：1450
  • 产品厂商：其它品牌
  • 产品文档：
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简单介绍：
Advantages The use of an electron beam enables not only observation of the submicron world (TEM’s SEM’s and X-ray microanalysers) but also processing with submicron precision (electron beam lithograph
详情介绍：
The relative drawbacks of tungsten cathodes are a work function of 4.7eV, insufficient beam current, and a short service life. LaB6 has a work function of 2.66eV – thus more easily emitting electrons – and is a relatively stable material, so it has been increasingly used as a material for cathodes instead of tungsten. Using LaB6 cathodes with TEM’s and SEM’s, even with the electron beam narrowed down, it is possible to obtain enough beam current to achieve better resolution and clear micrographs with less noise. The principle advantage, however, is that LaB6 can be used in a stable condition for a much longer time. Denka manufactures the purest, highest quality LaB6 crystals for use in their cathode tips.

Benefits
  • High Brightness: A LaB6 beam is 10 times brighter than tungsten, has superior resolution, and features a wide range of acceleration voltages. It provides sharp, clear pictures, down to the smallest detail. The initial brightness of a Denka Model 3 cathode (1 x 106A/cm2.Str) is substantially better than that of competing, mini-vogel type cathodes (typically 5 x 105A/cm2.Str).
  • Long Life: Heat and vacuum are the final determinants of any cathode tip’s life, but at 1550°C and a vacuum of 10-7 Torr, a service life of about 500 hours can be expected.
  • Stability: Thanks to its simple and durable construction, every Denka Model 3 LaB6 Cathode offers a stability of better than 3% per hour at 1550°C.
  • Interchangeability: Denka Model 3 LaB6 cathodes are designed as direct replacements for tungsten filaments when a vacuum in the 10-7 range is provided.
    Comparison of Tip Configurations Available with Denka M-3 LaB6 AEI style Cathodes
      Flat Tip Standard (Round) Tip Sharp Tip
      90° or 60° cone angle
    20/40/60/100µm flat tip radius    		 90° cone angle
    15µm tip radius    		 60° cone angle
    5µm and 10µm tip radius
    Brightness About 5 times that of tungsten
    2-5 x 105 A/cm2 • Str    		 About 10 times that of Tungsten
    1 x 106 A/cm2 • Str    		 Twice as bright as standard tips
    2 x 106 A/cm2 • Str
    Saturation Mono spot at about 1,400°C Mono spot at about 1,500°C Almost the same as standard tips
    Crossover Large (11-13µm) Small (7-10µm) Small (7-10µm)
    Angular Distribution Broad
    3.3-4.2 x 10-2rad    		 Sharp
    1.6 x 10-2rad    		 Sharp
    1.6 x 10-2rad
    Used Temperature Low Temperature High Temperature High Temperature
    Lifetime Long life (usable at low temperatures, and crystallized
    end changes slowly)    		 Long life; shorter than flat tips Short
    Operation Easy (thanks to its large spot size and broad adjusting range) Not so difficult Difficult (the point adjustment needed)
    Stability High (invulnerable to thermal expansion or vibration) High Middle (vulnerable to thermal expansion or vibration, adjustment is sometimes necessary)
    Technology Needed Ordinary High Very High
    Denka M-3 LaB6 Cathode for JEOL Instruments
    Prod # Description Unit
    1450
    		Denka M-3 LaB6, JEOL Cathode
    each
    Denka M-3 LaB6 Cathode for FEI, Philips Instruments (Except XL-30)
    Prod # Description Unit
    1451
    		Denka M-3 LaB6, FEI Philips Cathode
    each
    Denka M-3 LaB6 Cathode for AMRAY Instruments
    (except 1200 Series)
    Prod # Description Unit
    1452
    		Denka M-3 LaB6, AMRAY Cathode
    each
    Denka M-3 LaB6 Cathode for Cambridge (except S2A and S4-10), Camscan, Electroscan
    Leica, LEO and Zeiss (EVO®) Instruments
    Prod # Description Unit
    1453
    		Denka M-3 LaB6, Cambridge Cathode
    each
    Denka M-3 LaB6 Cathode for Hitachi Instruments
    Prod # Description Unit
    1454
    		Denka M-3 LaB6, Hitachi Cathode
    each

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