LaB6 Filaments / Cathodes – Denka
Standard Denka Model 3 LaB6 Cathodes
Lanthanum Hexaboride is the optimum cathode material for use in
- SEM
- TEM
- X-Ray Microanalysis
- Electron Beam Lithography
Features
- Low potential barrier (work function)
- High melting point and stability at high temperatures
- Low vapor pressure – reduces evaporation lost
- Chemical stability
- High brightness: LaB6 beam is ten times brighter than tungsten, has superior resolution – wide range of acceleration voltages. It provides sharp and clear pictures even to the smallest details. The initial brightness of a Denka Model 3 cathode (1 x 106 A/cm2.Str) is substantially better than that of competing mini-vogel type cathodes (typically 5 x 105 A/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 achieved.
- Stability: Every Denka Model 3 cathode offers a stability of better than 3% per hour at 1550°C
- Interchangeability: Denka Model3 LaB6 cathodes are designed as direct replacement for tungsten filaments.
Standard (Round) Tips
Provided with a 90° cone and 15µ radius round tip.
Flat (Truncated) Tips
Flat tips are recommended for applications where stability and long lifetime are the prime considerations, and where some degree of brightness can be sacrificed. Flat tips are available in eight configurations:
| 90° Cone Angle | 60° Cone Angle |
| 20µ radius | 20µ radius |
| 40µ radius | 40µ radius |
| 60µ radius | 60µ radius |
| 100µ radius | 100µ radius |
Sharp Tips
Sharp tips are recommended for applications where initial brightness is the foremost consideration and where shorter lifetime can be accepted. Sharp tips are available in two configurations.
| 60° Cone Angle |
| 5µ radius |
| 10µ radius |
| Flat Tip | Standard (round) Tip | Sharp Tip | |
| Brightness | About 5 times that of tungsten, 2-5x105 A/cm2· Str |
About 10 times that of tungsten, 1x106 A/cm2· Str |
Twice as bright as standard tips 2x106 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 (11-13µ) | Small (7-10µ) | Small (7-10µ) |
| Angular distribution | Broad, 3.3-4.2x10-2 rad | Sharp1.6 x10-2 rad | Sharp1.6 x10-2 rad |
| Used Temperature | Low temperature | Low temperature | High temperature. |
| Lifetime | Long life; usable at low temperatures and crystallized end changes slowly. | Long life but shorter than flat tips. | Short |
| Operation | Easy; thanks to its large spot size and broad adjusting range. | Not so difficult. | Difficult; Point adjustment needed! |
| Stability | High; vulnerable to thermal expansion or vibration. | High | Middle;. Vulnerable to the thermal expansion or vibration. Adjustment is sometimes necessary. |
| Technology Needed | Ordinary | High | Very high |
 AMRAY |
Philips Instruments |
 Hitachi |
 JEOL |
 ISI SEMs |
 ISI TEMs |
 Cambridge |
Zeiss |
Ordering
All standard Denka M-3 LaB6 Cathodes are provided with a 90° cone angle and a 15µm radius round tip. These are just the standard Denka LaB6 Cathodes that are in stock.
| 80900 | Denka M-3 LaB6 Standard for JEOL | each | 907.00 | Add to Cart |
| 80900-5 | Denka M-3 LaB6 for JEOL 60-5 µm | each | 967.00 | Add to Cart |
| 80900-10 | Denka M-3 LaB6 for JEOL 60-10 µm | each | 943.00 | Add to Cart |
| 80900-20 | Denka M-3 LaB6 for JEOL 60-20 µm | each | 1,013.00 | Add to Cart |
| 80900-40 | Denka M-3 LaB6 for JEOL 60-40 µm | each | 1,111.00 | Add to Cart |
| 80900-60 | Denka M-3 LaB6 for JEOL 60-60 µm | each | 1,208.00 | Add to Cart |
| 80900-80 | Denka M-3 LaB6 for JEOL 60-80 µm | each | 1,305.00 | Add to Cart |
| 80900-100 | Denka M-3 LaB6 for JEOL 60-100 µm | each | 1,402.00 | Add to Cart |
| 80900-11 | Denka M-3 LaB6 for JEOL 90-20 µm | each | 875.00 | Add to Cart |
| 80900-21 | Denka M-3 LaB6 for JEOL 90-40 µm | each | 971.00 | Add to Cart |
| 80900-41 | Denka M-3 LaB6 for JEOL 90-60 µm | each | 1,069.00 | Add to Cart |
| 80900-61 | Denka M-3 LaB6 for JEOL 90-80 µm | each | 1,166.00 | Add to Cart |
| 80900-101 | Denka M-3 LaB6 for JEOL 90-100 µm | each | 1,263.00 | Add to Cart |
| 80902 | Denka M-3 LaB6 Standard for Philips | each | 950.00 | Add to Cart |
| 80904 | Denka M-3 LaB6 Standard for AMRAY | each | 966.00 | Add to Cart |
| 80904-5 | Denka M-3 LaB6 for AMRAY sharp 60-5 µm | each | 966.00 | Add to Cart |
| 80904-10 | Denka M-3 LaB6 for AMRAY sharp 60-10 µm | each | 1,088.00 | Add to Cart |
| 80904-20 | Denka M-3 LaB6 for AMRAY flat 60-20 µm | each | 1,111.00 | Add to Cart |
| 80904-40 | Denka M-3 LaB6 for AMRAY flat 60-40 µm | each | 1,208.00 | Add to Cart |
| 80904-60 | Denka M-3 LaB6 for AMRAY flat 60-60 µm | each | 1,305.00 | Add to Cart |
| 80904-80 | Denka M-3 LaB6 for AMRAY flat 60-80 µm | each | 1,402.00 | Add to Cart |
| 80904-100 | Denka M-3 LaB6 for AMRAY flat 60-100 µm | each | 1,000.00 | Add to Cart |
| 80904-21 | Denka M-3 LaB6 for AMRAY flat 90-20 µm | each | 971.00 | Add to Cart |
| 80904-41 | Denka M-3 LaB6 for AMRAY flat 90-40 µm | each | 1,088.00 | Add to Cart |
| 80904-61 | Denka M-3 LaB6 for AMRAY flat 90-60 µm | each | 1,166.00 | Add to Cart |
| 80904-81 | Denka M-3 LaB6 for AMRAY flat 90-80 | each | 1,263.00 | Add to Cart |
| 80904-101 | Denka M-3 LaB6 for AMRAY flat 90-100 | each | 1,295.00 | Add to Cart |
| 80906 | Denka M-3 LaB6 Standard for Cambridge | each | 814.00 | Add to Cart |
| 80906-5 | Denka M-3 LaB6/Cambridge 60-5 µm | each | 967.00 | Add to Cart |
| 80906-10 | Denka M-3 LaB6/Cambridge 60-10 µm | each | 945.00 | Add to Cart |
| 80906-20 | Denka M-3 LaB6/Cambridge 60-20 µm | each | 1,013.00 | Add to Cart |
| 80906-40 | Denka M-3 LaB6/Cambridge 60-40 µm | each | 1,111.00 | Add to Cart |
| 80906-60 | Denka M-3 LaB6/Cambridge 60-60 µm | each | 1,208.00 | Add to Cart |
| 80906-80 | Denka M-3 LaB6/Cambridge 60-80 µm | each | 1,305.00 | Add to Cart |
| 80906-100 | Denka M-3 LaB6/Cambridge 60-100µm | each | 1,425.00 | Add to Cart |
| 80906-11 | Denka M-3 LaB6/Cambridge 90-20 µm | each | 874.00 | Add to Cart |
| 80906-21 | Denka M-3 LaB6/Cambridge 90-40 µm | each | 972.00 | Add to Cart |
| 80906-41 | Denka M-3 LaB6/Cambridge 90-60 µm | each | 1,069.00 | Add to Cart |
| 80906-61 | Denka M-3 LaB6/Cambridge 90-80 µm | each | 1,166.00 | Add to Cart |
| 80906-81 | Denka M-3 LaB6/Cambridge 90-100 µm | each | 1,374.00 | Add to Cart |
| 80908 | Denka M-3 LaB6 Standard for Hitachi 90-15 | each | 813.00 | Add to Cart |
| 80908-5 | Denka M3-H2 LaB6 for Hitachi 60-5 µm | each | 975.00 | Add to Cart |
| 80908-10 | Denka M3-H2 LaB6 for Hitachi 60-10 µm | each | 942.00 | Add to Cart |
| 80908-20 | Denka M3-H2 LaB6 for Hitachi 60-20 µm | each | 1,013.00 | Add to Cart |
| 80908-40 | Denka M3-H2 LaB6 for Hitachi 60-40 µm | each | 1,111.00 | Add to Cart |
| 80908-60 | Denka M3-H2 LaB6 for Hitachi 60-60 micro;m | each | 1,208.00 | Add to Cart |
| 80908-80 | Denka M3-H2 LaB6 for Hitachi 60-80 µm | each | 1,305.00 | Add to Cart |
| 80908-100 | Denka M3-H2 LaB6 for Hitachi 60-100 µm | each | 1,374.00 | Add to Cart |
| 80908-11 | Denka M3-H2 LaB6 for Hitachi 90-20 µm | each | 875.00 | Add to Cart |
| 80908-21 | Denka M3-H2 LaB6 for Hitachi 90-40 µm | each | 971.00 | Add to Cart |
| 80908-41 | Denka M3-H2 LaB6 for Hitachi 90-60 µm | each | 1,069.00 | Add to Cart |
| 80908-61 | Denka M3-H2 LaB6 for Hitachi 90-80 µm | each | 1,200.00 | Add to Cart |
| 80908-81 | Denka M3-H2 LaB6 for Hitachi 90-100 | each | 1,263.00 | Add to Cart |
| 80910 | Denka M-3 LaB6 Standard for ISI SEM | each | 850.00 | Add to Cart |
| 80912 | Denka M-3 LaB6 Standard for ISI TEM | each | 814.00 | Add to Cart |
| 80914 | Denka LaB6, Carl Zeiss 90-15 Round | each | 814.00 | Add to Cart |
| 80914-20 | Denka LaB6, Carl Zeiss 90-20 Flat | each | 950.00 | Add to Cart |
For all other LaB6 filaments in Flat Tip and Sharp tip just tell us what you require and we shall price it for you. The complete line of Denka Lab6 filaments is available through us.
