Crystal_Growth_F10

Crystal_Growth_F10 - Crystal Growth GLY 4200 Fall, 2010 1...

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1 Crystal Growth GLY 4200 Fall, 2010
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2 Mineral Size Mineral size - nm’s to tens of meters Mineral mass - nanograms to megagrams Stibnite crystals
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3 Methods of Crystal Growth From solution, usually aqueous From a melt By sublimation from a gas phase
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4 Nucleation Usually form from the initial crystallization products of solutions or melts Various ions must combine to form an initial regular structure pattern of a crystal Usually requires supersaturation
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5 Supersaturation Achieved by: Increasing concentration Changing temperature Changing pressure Rate of change is important Slow cooling leads to a few nuclei and large crystals Rapid cooling leads to many nuclei, small crystals
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6 Melts Growth is similar to aqueous dehydration High temperatures mean large thermal vibrations, which quickly break atomic clusters apart, destroying nuclei Low temperatures allow the attractive forces to overcome thermal vibration holding clusters together
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Growth From Melt 7
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This note was uploaded on 12/13/2010 for the course GLY 4200c taught by Professor Warburton during the Spring '10 term at FAU.

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Crystal_Growth_F10 - Crystal Growth GLY 4200 Fall, 2010 1...

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