Chapter 19.1

Chapter 19.1 - Thermal properties Heat capacity atomic...

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1 MSE 2090: Introduction to Materials Science Chapter 19, Thermal Properties Thermal properties ¾ Heat capacity • atomic vibrations, phonons • temperature dependence • contribution of electrons ¾ Thermal expansion • connection to anharmonicity of interatomic potential • linear and volume coefficients of thermal expansion ¾ Thermal conductivity • heat transport by phonons and electrons ¾ Thermal stresses
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2 MSE 2090: Introduction to Materials Science Chapter 19, Thermal Properties Heat capacity The heat capacity , C , of a system is the ratio of the heat added to the system, or withdrawn from the system, to the resultant change in the temperature: C = Δ Q/ Δ T = dQ/dT [J/deg] ¾ This definition is only valid in the absence of phase transitions ¾ Usually C is given as specific heat capacity , c , per gram or per mol ¾ Heat capacity can be measured under conditions of constant temperature or constant volume. Thus, two distinct heat capacities can be defined: V V dT q C δ
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Chapter 19.1 - Thermal properties Heat capacity atomic...

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