gallium - home | santa rosa junior college
TRANSCRIPT
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Gallium
By Nancy Ruiz, Clayton Alderson and Nick Parks
Santa Rosa Junior College
Spring 2014
Engineering 45
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“There is an incredible metal that shatters like
glass, melts in a human hand, attacks other
metals but is non-toxic to humans, and acts like
an alien life form when exposed to sulfuric acid
and dichromate solution”.
--Gajitz.com
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Gallium is a metal that is liquid
just above room temperature. As
a solid, pure gallium is brittle
and a poor electrical conductor.
Fun Facts
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● Gallium exists in all human bodies in a
small quantity of ½ mm3.
● Gallium exists in the earth’s crust at 16
PPM
● Gallium is 10,000 times more abundant
on earth than the rest of the solar
system.
Fun Facts
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Low Melting Point
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● Melting point is 29.76 °C
● Boiling point is 2229 °C
● Second largest liquid range of any element
● Crystal Structure: Orthorhombic
● 1 of 5 elements that expand when they freeze
● Does not appear in nature and must be extracted
● Obtained from bauxite, germanite, coal
● Leading producers are China, Germany and
Kazakhstan.
Fun Facts
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● Semiconductor production (gallium arsenide)
○ Gallium arsenide has a similar structure to silicon
● High temperature thermometer
○ Non-toxic substitute for mercury (boiling point only 357 °C)
○ Gallium more temperature sensitive than mercury
● Aluminum-gallium-arsenide (AlGaAs) used to make LEDs
● Microwave and radar equipment
● Mirrors
● Nuclear weapons
○ Stabilizes allotropes in plutonium
What is Gallium used in?
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● Aluminum Gallium Reaction- Gallium
reacts with Aluminum to create an
Aluminum alloy that crumbles at the
touch.
● Gallium Aluminum & Water reaction.
When the Aluminum alloy is exposed to
water it reacts violently to create a new
Aluminum alloy and hydrogen gas (H2).
Gallium Experiments
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Gallium attacks many metals including
Aluminum & Steel by diffusing into the
grain boundaries making them extremely
brittle. Gallium easily alloys with many
metals in low quantities.
Why this happens?
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Experiment
● High performance camera
● Aluminum cans
● Computer
● Gallium
● Scratching tool
● Solar heat source
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❖1/16” thick sheet
❖Aluminum foil
❖Aluminum can
We experimented with:
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Needed a long time for
enough Gallium to react
with the Aluminum to cause
a noticeable change in the
the metal.
Experiment with 1/16” sheet
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Process on Aluminum Sheet
start time: 0 min
after 8 min
after 13 min
after 19 min
after 50 min
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The Aluminum reacted
with the Gallium very
fast. When we
attempted to scratch off
the oxide layer, we
compromised the
structural integrity of
the Aluminum which
made it hard for us to
know how fast the
reaction went.
Experiment with Aluminum Foil
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The Aluminum can
worked best
because it was very
strong to start with
and also thin
enough for the
reaction to make
rapid changes.
Experiment with Aluminum Cans
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Gallium and Aluminum
https://www.youtube.com/watch?v=rY3rYe0Mn1Y
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Gallium, Aluminum and Water
https://www.youtube.com/watch?v=NiybHvz8Tag
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In conclusion, Gallium is a very interesting
metal that can do many unique things.
Gallium can be useful in alloys but is also
very corrosive to some metals. Even
though some of Gallium’s properties have
no practical application they are still very
interesting to analyze.
Gallium Experiment
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Works Cited
● http://www.chemicalelements.com/elements/ga.html
● http://www.rsc.org/periodic-table/element/31/gallium
● http://www.chemicool.com/elements/gallium.html
● http://www.lenntech.com/periodic/elements/ga.htm
● https://sites.psu.edu/passionmalencia/2013/04/16/gallium/
● http://www.avalonraremetals.com/projects/target_commod
ities/rare_metals/gallium/