Page 9 - Shimadzu EPMA-1720 Series

Fully Exploits the Performance of the

High-Brightness Electron Source CeB 6

The CeB 6 cathode provides a bright, easily handled electron source.
EPMA-1720HT fully exploits the properties of the CeB6 cathode to achieve high
spatial resolution that is stable over long periods.
* EPMA-1720T is for a tungsten lament only; EPMA-1720HT is for both a tungsten lament and CeB 6 cathode.

SEM Observation Mapping Analysis

Image of Tin Balls Analysis of solder
Magnification: 10,000× Element: Pb; region 14 × 14 ˆm

Differences Between Work Functions of CeB 6 and LaB 6
2.7
Since CeB 6 has a smaller work function than LaB 6,
LaB6 it offers the excellent characteristic of producing
2.6
Work function (eV) 2.5 CeB6 highlybright emissions at lower temperatures.

2.4
2.3
1500 1600 1700 1800 1900
Temperature (K)

Comparison of Evaporation Rates of CeB 6 and LaB 6
10 −7 When CeB 6 is heated, it has a signi­cantly lower
evaporation rate than LaB 6; as a result, the CeB 6
CeB6 has a longer service life.
Evaporation rate g/cm 2 ·sec 10 −9 LaB6
−8
10

LaB 6 optimal
temperature CeB 6 optimal temperature
10 −10
Heating temperature (K)

EPMA-1720 Series
Electron Probe Microanalyzer 9