Back
Template:POTD/2015-12-30
Picture of the day archives
:
2015 December
<
2015 December 29
2015 December 31
>
Picture of the day
Pellets of 99.9% pure
argon-arc remelted
hafnium
, with visible crystalline structures. The colors are a
thin-film effect
in the oxide layer; this
chemical element
is generally a
lustrous
, silvery gray,
tetravalent
transition metal
. Hafnium is widely used in filaments and electrodes, as well as in some
superalloys
.
Photograph:
Heinrich Pniok
Archive
–
More featured pictures...
From
Wikipedia
, the free encyclopedia · View on
Wikipedia
Developed by
Tubidy