Return to search

Calculation Of Phase Diagrams And The Thermodynamic Quantities From The Mean Field Models Close To Phase Transitions In Molecular And Liquid Crystals

This study gives our calculations for the temperature-pressure and
temperature-concentration phase diagrams using the mean field models applied to
ammonium halides (NH4Cl, ND4Cl), ammonium sulfate ((NH4)2SO4/H2O), lithium
potassium rubidium sulfate (LiK1-xRbxSO4), potassium pyrosulfate-potassium
hydrogensulfate (K2S2O7-KHSO4), cholestanyl myristate-cholesteryl myristate
(CnM-CrM), cholestanyl myristate-cholesteryl oleate (CnM-CO), benzene (C6H6)
and ice. The phase line equations are derived from the free energies expanded in
terms of the order parameters and they are fitted to the experimental data. Some
thermodynamic quantities are calculated close to phase transitions in these
crystalline systems.
We also calculate the specific heat CV using the Raman frequency shifts for
NH4Br on the basis of an Ising model close to the lambda-phase transition. A linear
relationship is obtained between the specific heat CP and the frequency shifts
(1/v)(dv/dT)P near the lambda-point in NH4Br.

Identiferoai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/2/12610436/index.pdf
Date01 February 2009
CreatorsSen, Sema
ContributorsYurtseven, Hamit
PublisherMETU
Source SetsMiddle East Technical Univ.
LanguageEnglish
Detected LanguageEnglish
TypePh.D. Thesis
Formattext/pdf
RightsTo liberate the content for METU campus

Page generated in 0.0017 seconds