The thermodynamic properties of solid Li are mainly determined by acoustic modes of oscillation for temperature higher than a few Kelvin. Li crystallizes in a BCC structure with lattice constant (cube side) a= 3.5A. (a) Sketch the heat capacity of Li as a function of temperature. Indicate explicitly the value at large temper- ature. (b) If the sound velocity at low frequency is v = 6 10° cm/sec, what is the value of the Debye frequency wD and Debye temperature Tp?
The thermodynamic properties of solid Li are mainly determined by acoustic modes of oscillation for temperature higher than a few Kelvin. Li crystallizes in a BCC structure with lattice constant (cube side) a= 3.5A. (a) Sketch the heat capacity of Li as a function of temperature. Indicate explicitly the value at large temper- ature. (b) If the sound velocity at low frequency is v = 6 10° cm/sec, what is the value of the Debye frequency wD and Debye temperature Tp?
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Transcribed Image Text:1. The thermodynamic properties of solid Li are mainly determined by acoustic modes of oscillation for
temperature higher than a few Kelvin. Li crystallizes in a BCC structure with lattice constant (cube side)
a = 3.5À.
(a) Sketch the heat capacity of Li as a function of temperature. Indicate explicitly the value at large temper-
ature.
(b) If the sound velocity at low frequency is v = 6 10° cm/sec, what is the value of the Debye frequency wp
and Debye temperature Tp?
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