Register to reply

Density of states

by drcrabs
Tags: density, states
Share this thread:
drcrabs
#1
Apr17-06, 08:08 PM
P: 47
upon recent studies of the Density of states and Specific heat capacities, ive found the Einstien and Debye Models to be very helpful, Debye being the more accurate of the two models at low temperatures as it takes into account the low frequency modes.

However, the realistic density of states e.g for solid Argon, seems to not fit either the Debye or the Einstien model at moderate temperatures. The realistic density of states seems to increase faster than any other model as the temperature increases.

Why is this? Are there additional modes we are not taking into account?
Phys.Org News Partner Physics news on Phys.org
Technique simplifies the creation of high-tech crystals
Working group explores the 'frustration' of spin glasses
New analysis of oxide glass structures could guide the forecasting of melt formation in planetary interiors
Gokul43201
#2
Apr17-06, 08:32 PM
Emeritus
Sci Advisor
PF Gold
Gokul43201's Avatar
P: 11,155
Do you have a reference for the density of modes in solid argon ? It's not clear (to me) what exactly you are comparing. Are you really looking at the temperature dependence or the frequency dependence ? And are you comparing each of the 3 modes (2 transverse and one longitudinal) separately ?
drcrabs
#3
Apr17-06, 09:28 PM
P: 47
Actuallty what im looking at is the temperature dependacy of the specific heat capacity

ZapperZ
#4
Apr18-06, 07:39 AM
Emeritus
Sci Advisor
PF Gold
ZapperZ's Avatar
P: 29,239
Density of states

I think there needs to be a clearer distinction made here between the "regular" density of states, which is really the electronic density of states, versus the phonon density of states. The latter is what you are asking for.

Zz.


Register to reply

Related Discussions
Density of States Atomic, Solid State, Comp. Physics 4
Density of states General Physics 0
Density of states? Quantum Physics 1
What is the essentail difference between local density of states and density of state Atomic, Solid State, Comp. Physics 2
Help, Density of States Atomic, Solid State, Comp. Physics 1