Why Does Iron Have a Higher Molar Specific Heat Than Its Debye Value?

[izzmach]

Why does iron have molar specific heat greater than Debye value 3R?

 

[Dannalee Jayvia]

Specific temperature known as Debye temperature. The saturation value is approximately equal to 3R.

Heat capacity increases with temperature and reaches a limiting value of 3R =25 JK-1mol-1, where R is the gas constant
Most solid materials expand upon heating and contract when cooled. The parameter is called the linear coefficient of thermal expansion; it is a material property that is indicative of the extent to which a material expands upon heating, and has units of reciprocal temperature [(0C)-1 or (0F)-1]. If a very deep energy trough caused by strong atomic bonding is characteristic of the material, the atoms separate to a lesser and the material has low linear coefficient of thermal expansion. This relationship also suggests that materials having a high melting temperature – also due to strong atomic bonds – have low thermal expansion coefficients.
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