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Solid
gallium is a blue-gray metal with orthorhombic crystalline structure; very
pure gallium has a stunning silvery color. Gallium is solid at normal room
temperatures, but as well as mercury, cesium, and rubidium it becomes
liquid when heated slightly. Solid gallium is soft enough to be cut with a
knife. It is stable in air and water; but it reacts with and dissolves in
acids and alkalis.
Ultra-pure
gallium has a beautiful, silvery appearance, and the solid metal exhibits
a conchoidal fracture similar to glass. The metal expands on solidifying;
therefore, it should not be stored in glass or metal containers, as they
may break as the metal solidifies.
Analog integrated circuits are the most common application for gallium,
with optoelectronic devices (mostly laser diodes and light-emitting
diodes) as the second largest end use. Gallium has semiconductor
properties, especially as gallium arsendite (GaAs). This can convert
electricity to light and is used in light emitting diodes (LEDs) for
electronic display and watches.Liquid gallium wets porcelain and glass
surfaces; it forms a bright, highly reflective surface when coated on
glass. It can be used to create brilliant mirrors. Gallium easily alloys
with most metals, so it is used to form low-melting alloys.It is the only
metal, except for mercury, caesium, and rubidium, which can be liquid near
room temperatures; this makes possible its use in high-temperature
thermometers. It has one of the longest liquid ranges of any metal and has
a low vapour pressure even at high temperatures.
Basic
Information
Name:
Gallium
Symbol: Ga
Atomic Number: 31
Atomic Mass: 69.723 amu
Melting Point: 29.78 ¡ãC (302.93 ¡ãK, 85.604004 ¡ãF)
Boiling Point: 2403.0 ¡ãC (2676.15 ¡ãK,4357.4 ¡ãF) |
Number
of Protons/Electrons:
31
Number of Neutrons: 39
Classification: Other
Metals
Crystal Structure: Orthorhombic
Density @ 293 K: 5.907 g/cm3
Color:White/Silver |
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High
Pure Gallium Metal (Ga)
Purity---
99.999%
(Ag,Al,Ca,Cu,Fe,Mg,Ni,Pb,Sn,Zn,Si,Hg,In total<10ppm)
99.9999%
(Ag,Al,Cu,Fe,Mg,Ni,Pb,Sn,Zn,Mn,Cr,Si total<10ppm)
99.99999% (Ag,Al,Cu,Fe,Mg,Pb,Sn,Zn,Mn,Si
total<10ppm)
Shape--- Silver
white at liquid state, blue white at solid state, no oxid on surface.
Application
--- Primarily used in the manufacturing of III-V compound semiconductors
(GaAs, GaN, GaP...) High purity alloys , the thermal carrier in atomic
reacotor and also used as the dopant of monocrystalline silicon and germanium
, etc. |
