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Old Nov 15th 2013, 07:42 AM   #1
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Thermal expansion and anharmonicity

(sorry for my english)

Solid state physics books (for example Aschroft/Mermin) say that in a perfect harmonic crystal there isn't thermal expansion. On the other hand , they calculate grüneisen parameter and coefficient of thermal expansion for the Debye model (which is a purely harmonic model) . Does someone understand this contradiction ?
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