Selenium Powder Selenium Nano Powder 99.99% 4n

1. material overview
characteristics:
amorphous red powder, becoming black on standing and crystalline on heating; vitreous and colloidal forms may be prepared. Amorphous form softens at 40 â°c and melts at 217 â°c. It rarely occurs in its elemental state in nature, or as pure ore compounds. Soluble in concentrated nitric acid and in (liquid form) common alkalies. Forms binary alloys with silver, copper, zinc, lead, etc. Low toxicity. A necessary nutritional factor for animals.
Hazards:
selenium salts are toxic in large amounts, but trace amounts are necessary for cellular function
applications:
selenium could be used in different fields, according to its purity. Selenium is now used in a variety of applications, from glass and metallurgical applications to pigments, agriculture and electronics.
2. General properties
symbol:se
cas7782-49-2
atomic number:34
atomic weight:78.96
density:4.79 gmcc
melting point:217 oc
boiling point:684.9 oc
thermal conductivity:0.00519 wcmk @ 298.2 k
electrical resistivity:106 microhm-cm @ 0 oc
electronegativity:2.4 paulings
specific heat:0.767 calgk @ 25 oc
heat of vaporization:3.34 k-calgm atom at 684.9 oc
heat of fusion:1.22 calgm mole
3. Specification
se % 99.99 min
cu 0.0001max
hg 0.0002
as 0.0001
sb 0.0003max
te 0.0001max
pb 0.0003max
fe 0.0009
sn 0.0001max
ni 0.0001
bi 0.0001max
al 0.0001max
si 0.0002
s 0.0003