Specific Heats and Temperature

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The specific heat capacity of materials varies with temperature, and resources are sought for a comprehensive list of specific heat capacities across a wide temperature range, particularly at high temperatures. Touloukian et al.'s "Thermophysical Properties of Matter" is recommended for measured values against temperature. Most metals exhibit a molar heat capacity of approximately 3R at room temperature and converge to this value at elevated temperatures. Simple compounds also show varying heat capacities around 3R per atom, influenced by atomic energy storage in crystals, as explained by statistical mechanics. A wealth of data is available at the NIST Chemistry WebBook for further exploration.
Nabeshin
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I understand the the specific heat capacity of a material is a function of temperature.

Does anyone know of either a site (or reference) which has a large list of specific heat capacities for varying temperatures (large variety of temperatures is preferable to a large variety of materials), or a general relation between specific heat capacity and temperature? My interest is primarily on the higher bound of temperature, likely in the range of high hundreds to possibly mid thousands of kelvin, so if the specific heat capacities converged to some limit or something around that value, that would be great.
 
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Check Touloukian et al, Thermophysical Properties of Matter (1970) (New York: IFI/Plenum) for measured value vs. temperature.

Most metals have a molar heat capacity of 3R at room temperature (about 25 J mol-1 K-1), and most or all solid elements converge to this value at high temperatures. Simple compounds often have a heat capacity varying broadly around 3R per atom (e.g., NaCl, 50 J mol-1 K-1; as an ionic crystal, particularly close). This is a consequence of the energy-storing capacity of atoms in a crystal and is modeled/explained by the field of statistical mechanics.
 
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