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Denka M-3 LaB6 Cathodes

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 lithography systems). The optimum cathode material for use in these instruments would possess the following properties:
  • Low potential barrier (work function)
  • High melting point and stability at high temperatures
  • Low vapor pressure so as to reduce evaporation loss
  • Chemical stability
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



Ordering Information for

Standard Denka M-3 LaB6 Cathodes
provided with a 90° cone angle and 15µm radius round tip.
 
denka jeol electron microscope Denka M-3 LaB6 Cathode for JEOL Instruments
(compatible with K-type filament base)

Prod #DescriptionUnitPriceOrder / Quote
1450
Denka M-3 LaB6, JEOL Cathode
each
$1,090.00
Qty:




denka philips electron microscope Denka M-3 LaB6 Cathode for FEI, Philips Instruments (Except XL-30)

Prod #DescriptionUnitPriceOrder / Quote
1451
Denka M-3 LaB6, FEI Philips Cathode
each
$1,149.00
Qty:




denka amray electron microscope Denka M-3 LaB6 Cathode for AMRAY Instruments
(except 1200 Series)

Prod #DescriptionUnitPriceOrder / Quote
1452
Denka M-3 LaB6, AMRAY Cathode
each
$1,149.00
Qty:




denka cambridge electron microscope Denka M-3 LaB6 Cathode for Cambridge (except S2A and S4-10), Camscan, Electroscan
Leica, LEO and Zeiss (EVO®) Instruments

Prod #DescriptionUnitPriceOrder / Quote
1453
Denka M-3 LaB6, Cambridge Cathode
each
$995.00
Qty:




denka hitachi electron microscope Denka M-3 LaB6 Cathode for Hitachi Instruments

Prod #DescriptionUnitPriceOrder / Quote
1454
Denka M-3 LaB6, Hitachi Cathode
each
$995.00
Qty:




Ordering Information for

Denka M-3 LaB6 Cathodes Sharp and Flat Tips
AMRAY (Except 1200 Series)

Prod #DescriptionUnitPriceOrder / Quote
1455
Denka LaB6 Filament, AM/60-5, Sharp Tip
each
$1,189.00
Qty:
1456
Denka LaB6 Filament, AM/60-10, Sharp Tip
each
1,160.00
Qty:
1457
Denka LaB6 Filament, AM/60-20, Flat Tip
each
1,249.00
Qty:
1458
Denka LaB6 Filament, AM/60-40, Flat Tip
each
1,367.00
Qty:
1459
Denka LaB6 Filament, AM/60-60, Flat Tip
each
1,486.00
Qty:
1460
Denka LaB6 Filament, AM/60-100, Flat Tip
each
1,726.00
Qty:
1461
Denka LaB6 Filament, AM/90-20, Flat Tip
each
1,074.00
Qty:
1462
Denka LaB6 Filament, AM/90-40, Flat Tip
each
1,194.00
Qty:
1463
Denka LaB6 Filament, AM/90-60, Flat Tip
each
1,314.00
Qty:
1464
Denka LaB6 Filament, AM/90-100, Flat Tip
each
1,553.00
Qty:
Numbers represent: Cone Angle - Tip Radius in µm

AEI style for Cambridge, Leica, LEO, Zeiss (EVO®)

Prod #DescriptionUnitPriceOrder / Quote
1465
Denka LaB6 Filament, CA/60-5, Sharp Tip
each
$1,189.00
Qty:
1466
Denka LaB6 Filament, CA/60-10, Sharp Tip
each
1,160.00
Qty:
1467
Denka LaB6 Filament, CA/60-20, Flat Tip
each
1,299.00
Qty:
1468
Denka LaB6 Filament, CA/60-40, Flat Tip
each
1,367.00
Qty:
1469
Denka LaB6 Filament, CA/60-60, Flat Tip
each
1,486.00
Qty:
1470
Denka LaB6 Filament, CA/60-100, Flat Tip
each
1,726.00
Qty:
1471
Denka LaB6 Filament, CA/90-20, Flat Tip
each
1,074.00
Qty:
1472
Denka LaB6 Filament, CA/90-40, Flat Tip
each
1,194.00
Qty:
1473
Denka LaB6 Filament, CA/90-60, Flat Tip
each
1,314.00
Qty:
1474
Denka LaB6 Filament, CA/90-100, Flat Tip
each
1,553.00
Qty:
Numbers represent: Cone Angle - Tip Radius in µm

Hitachi

Prod #DescriptionUnitPriceOrder / Quote
1475
Denka LaB6 Filament, H2/60-5, Sharp Tip
each
$1,189.00
Qty:
1476
Denka LaB6 Filament, H2/60-10, Sharp Tip
each
1,160.00
Qty:
1477
Denka LaB6 Filament, H2/60-20, Flat Tip
each
1,249.00
Qty:
1478
Denka LaB6 Filament, H2/60-40, Flat Tip
each
1,367.00
Qty:
1479
Denka LaB6 Filament, H2/60-60, Flat Tip
each
1,486.00
Qty:
1480
Denka LaB6 Filament, H2/60-100, Flat Tip
each
1,726.00
Qty:
1481
Denka LaB6 Filament, H2/90-20, Flat Tip
each
1,074.00
Qty:
1482
Denka LaB6 Filament, H2/90-40, Flat Tip
each
1,194.00
Qty:
1483
Denka LaB6 Filament, H2/90-60, Flat Tip
each
1,314.00
Qty:
1484
Denka LaB6 Filament, H2/90-100, Flat Tip
each
1,553.00
Qty:
Numbers represent: Cone Angle - Tip Radius in µm

ISI, ABT, Topcon

Prod #DescriptionUnitPriceOrder / Quote
1492
Denka LaB6 Filament, ISS/90-20, Flat Tip
each
$995.00
Qty:
1493
Denka LaB6 Filament, ISS/90-40, Flat Tip
each
995.00
Qty:
1500
Denka LaB6 Filament, ISS/60-40, Flat Tip
each
1,138.00
Qty:
Numbers represent: Cone Angle - Tip Radius in µm

JEOL (Compatible with K-type Filament Base)

Prod #DescriptionUnitPriceOrder / Quote
1507
Denka LaB6 Filament, LKS/60-20, Flat Tip
each
$1,249.00
Qty:
1508
Denka LaB6 Filament, LKS/60-40, Flat Tip
each
1,367.00
Qty:
1509
Denka LaB6 Filament, LKS/60-60, Flat Tip
each
1,486.00
Qty:
1510
Denka LaB6 Filament, LKS/60-100, Flat Tip
each
1,726.00
Qty:
1511
Denka LaB6 Filament, LKS/90-20, Flat Tip
each
1,074.00
Qty:
1512
Denka LaB6 Filament, LKS/90-40v, Flat Tip
each
1,194.00
Qty:
1513
Denka LaB6 Filament, LKS/90-60, Flat Tip
each
1,314.00
Qty:
1514
Denka LaB6 Filament, LKS/90-100, Flat Tip
each
1,553.00
Qty:
1515
Denka LaB6 Filament, LKSH60, 10µm Sharp Tip, TEM only
each
1,160.00
Qty:
1516
Denka LaB6 Filament, LKSH60S, 5µm Sharp Tip, TEM only
each
1,189.00
Qty:
Numbers represent: Cone Angle - Tip Radius in µm

FEI, Philips (Except XL-30)

Prod #DescriptionUnitPriceOrder / Quote
1517
Denka LaB6 Filament, PH2/60-5, Sharp Tip
each
$1,189.00
Qty:
1518
Denka LaB6 Filament, PH2/60-10, Sharp Tip
each
1,160.00
Qty:
1519
Denka LaB6 Filament, PH2/60-20, Flat Tip
each
1,249.00
Qty:
1520
Denka LaB6 Filament, PH2/60-40, Flat Tip
each
1,367.00
Qty:
1521
Denka LaB6 Filament, PH2/60-60, Flat Tip
each
1,486.00
Qty:
1522
Denka LaB6 Filament, PH2/60-100, Flat Tip
each
1,595.00
Qty:
1523
Denka LaB6 Filament, PH2/90-20, Flat Tip
each
1,074.00
Qty:
1524
Denka LaB6 Filament, PH2/90-40, Flat Tip
each
1,194.00
Qty:
1525
Denka LaB6 Filament, PH2/90-60, Flat Tip
each
1,314.00
Qty:
1526
Denka LaB6 Filament, PH2/90-100, Flat Tip
each
1,553.00
Qty:
Numbers represent: Cone Angle - Tip Radius in µm


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Page Last Updated: July 7, 2011