|
![]() |
#5386 |
..........
Join Date: Dec 2006
Casino cash: $4157901
|
Beryllium (Gr. berryllos, beryl; also called Glucinium or Glucinum, Gr. glykys, sweet
![]() |
Posts: 28,392
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() |
![]() |
#5387 |
..........
Join Date: Dec 2006
Casino cash: $4157901
|
Beryllium is found in some 30 mineral species, the most important of which are: beryl, chrysoberyl, and phenacite.
|
Posts: 28,392
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() |
![]() |
#5388 |
..........
Join Date: Dec 2006
Casino cash: $4157901
|
Aquamarine and emerald are precious forms of beryl. Beryl (3BeO Al2O3 6SiO2) is the most important commercial source of the element and its compounds.
|
Posts: 28,392
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() |
![]() |
#5389 |
..........
Join Date: Dec 2006
Casino cash: $4157901
|
Most of the metal is now prepared by reducing beryllium fluoride with magnesium metal. Beryllium metal did not become readily available to industry until 1957. The metal, steel gray in color, has many desirable properties.
|
Posts: 28,392
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() |
![]() |
#5390 |
..........
Join Date: Dec 2006
Casino cash: $4157901
|
It is one of the lightest of all metals, and has one of the highest melting points of the light metals. Its modulus of elasticity is about one-third greater than that of steel. It resists attack by concentrated nitric acid, has excellent thermal conductivity, and is nonmagnetic.
|
Posts: 28,392
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() |
![]() |
#5391 |
..........
Join Date: Dec 2006
Casino cash: $4157901
|
It has the high permeability to X-rays, and when bombarded by alpha particles, as from radium or polonium, neutrons are produced in the ratio of about 30 neutrons/million alpha particles.
|
Posts: 28,392
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() |
![]() |
#5392 |
..........
Join Date: Dec 2006
Casino cash: $4157901
|
At ordinary temperatures beryllium resists oxidation in air, although its ability to scratch glass is probably due to the formation of a thin layer of the oxide. Beryllium is used as an alloying agent in producing beryllium copper, which is extensively used for springs, electrical contacts, spot-welding electrodes, and nonsparking tools. It is finding application as a structural material for high-speed aircraft, missiles, and spacecraft. It is used in nuclear reactors as a reflector or moderator for it has a low thermal neutron absorption cross section. It is used in gyroscopes, computer parts, and inertial guidance instruments where lightness, stiffness, and dimensional stability are required.
|
Posts: 28,392
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() |
![]() |
#5393 |
..........
Join Date: Dec 2006
Casino cash: $4157901
|
The oxide has a very high melting point and is also used in nuclear work and ceramic applications. Beryllium and its salts are toxic and should be handled with the greatest care. Beryllium and its compounds should not be tasted to verify the sweetish nature of beryllium (as did early experimenters). The metal, its alloys, and its salts can be handled safely if certain work codes are observed, but no attempt should be made to work with beryllium before becoming familiar with proper safeguards. The maximum allowable concentration of beryllium dust in an 8-hr. day is recommended to be about 2 u gms./cu. meter in working areas. The average monthly concentration should not exceed 0.01 u gms/cu. meter in non-working areas. Beryllium metal in vacuum cast billet form is priced roughly at $70/lb. Fabricated forms are more expensive.
|
Posts: 28,392
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() |
![]() |
#5394 |
You Sweetie!
Join Date: Sep 2005
Casino cash: $2021206219
![]() |
at
|
Posts: 71,691
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() |
![]() |
#5395 |
You Sweetie!
Join Date: Sep 2005
Casino cash: $2021206219
![]() |
least
|
Posts: 71,691
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() |
![]() |
#5396 |
You Sweetie!
Join Date: Sep 2005
Casino cash: $2021206219
![]() |
you
|
Posts: 71,691
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() |
![]() |
#5397 |
You Sweetie!
Join Date: Sep 2005
Casino cash: $2021206219
![]() |
aren't
|
Posts: 71,691
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() |
![]() |
#5398 |
You Sweetie!
Join Date: Sep 2005
Casino cash: $2021206219
![]() |
a
|
Posts: 71,691
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() |
![]() |
#5399 |
You Sweetie!
Join Date: Sep 2005
Casino cash: $2021206219
![]() |
p
|
Posts: 71,691
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() |
![]() |
#5400 |
You Sweetie!
Join Date: Sep 2005
Casino cash: $2021206219
![]() |
o
|
Posts: 71,691
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
![]() |
![]() ![]() |
|
|