MGF
MGF may stand for:
Magnesium fluoride
Magnesium fluoride is an inorganic compound with the formula MgF2. The compound is a white crystalline salt and is transparent over a wide range of wavelengths, with commercial uses in optics that are also used in space telescopes. It occurs naturally as the rare mineral sellaite.
Production and structure
Magnesium fluoride is prepared from magnesium oxide with sources of hydrogen fluoride such as ammonium bifluoride:
Related metathesis reactions are also feasible.
The compound crystallizes as tetragonal birefringent crystals. The structure of the compound is similar to that in rutile, featuring octahedral Mg2+ centers and 3-coordinate fluoride centres.
Uses
Optics
Magnesium fluoride is transparent over an extremely wide range of wavelengths. Windows, lenses, and prisms made of this material can be used over the entire range of wavelengths from 0.120 μm (vacuum ultraviolet) to 8.0 μm (infrared). High quality synthetic VUV grade MgF2 is quite expensive, in the region of $3/kg (2007) but the real cost of optics in this material is due to relatively low volume manufacture. However, with lithium fluoride it is one of the two materials that will transmit in the vacuum ultraviolet range at 121 nm (Lyman alpha) and this is where it finds its application. Lower grade MgF2 is sometimes used in the infrared but here it is inferior to calcium fluoride. MgF2 is tough and works and polishes well, but it is slightly birefringent and should be cut with the optic axis perpendicular to the plane of the window or lens.
Podcasts:
Machine Gun Fellatio
ALBUMS
- On Ice released: 2004
- Paging Mr. Strike released: 2003
- Bring It On! released: 2000
- On Ice released:
- 2001-01-22: Triple J: Live at the Wireless released:
- 2002-09-16: Triple J: Live at the Wireless released:
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by Demi Lovato
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by Cappadonna
Make A Wave
by: Demi Lovatojoe : They say the beat of a butterflies wings,
can set off a storm a world away
Demi : What if they're right and the smallest of things,
can power the strongest hurricane
joe : What if it all begins inside
Demi : We hold the key that turns the tide
CHORUS
Both : Just a pebble in the water
Demi : ooh
Demi : Can set the sea in motion
Demi : ooh
Both : A simple act of kindness
Demi: ohh
joe : Can stir the widest ocean
Both : If we show a little love
heaven knows what we could change
oh yeah
so throw a pebble in the water
Joe: Oh Yeah
Both : Mave a wave
Demi : Make a wave
joe : Make a wave, make a wave
VERSE 2
Demi : The single choice to take a stand
joe : And reach out your hand to someone in need
(help somebody)
demi : Don't fool yourself and say you can't
joe : You never know what can grow
from just one seed
demi : yeahhh
so come with me and seize the day
this world may never be the same
CHORUS
Both : Just a pebble in the water
Demi : Just a pebble in the water
Both : Can set the sea in motion
joe : Can set the sea in motion
Both : A simple act of kindness
demi: ohhh
both : Can stir the widest ocean
joe : Can stir the widest ocean
Both : If we show a little love
joe : If we show a little love
Both : Heaven knows what we could change
Demi : Heaven knows what we could change
Both: so throw a pebble in the water
joe : throw a pebble in the water
Both : Make a wave
Demi : Make a wave
joe : Make a wave
BRIDGE
Demi: Yea yea yea yea yeahhh
joe : Make a wave, make a wave
Demi: Make a wave Yeah
joe : Show a little love make a wave, seize the day yeahh
Demi: make a wave, heaven knows what we could change
joe : ohh
Demi: So let's show a little love, you never know what we can change
joe : So throw a pebble in the water
demi: mmmmmmmm
both : Make a wave, make a wave
joe: oohh wooah