Specific heat of NH4Cl and NH4BrxCl 1-x crystals close to the ferro-ordered phase

Date

2009-04-01

Author

Yurtseven, Hasan Hamit

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https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=70349206009&origin=inward
https://hdl.handle.net/11511/88408

Journal

Journal of the Chemical Society of Pakistan

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Specific Heat of NH4Cl and NH4BrxCl1-x Crystals Close to the Ferro-Ordered Phase Yurtseven, Hasan Hamit (2009-04-01) This study gives calculation of the specific heat C-VI of NH4Cl and NH4BrxCl1-x under the Ising model for the transition between the disordered (D) and ferro-ordered O(F) phases in these crystalline systems. Our C-VI values which we calculated for x = 0 and x = 0.04, agree both below and above T-c with the observed C-p data from the literature. Our value of a congruent to 0.1 (T < T-c and T > T-c) is in good agreement with the predicted value of 1/8 (0.125) of a 3D Ising model.
Specific heat of NH4Br and NH4BrxCl1-x crystals close to the antiferroelectric transition Yurtseven, Hasan Hamit (AIP Publishing, 2005-11-01) We calculate the specific heat C-VI of NH4Br and mixed crystals of NH4BrxCl1-x using the Ising model for the transition between the disordered (D) and antiferro- (AF) electric phases in these crystalline systems. Our C-VI values, which we calculated for x(Br)=1, 0.26, and 0.51 are in good agreement, both below and above T-C, with the observed C-P data from the literature. Our value of congruent to 0.1 (T < T-C and T>T-C) for the critical exponent of the specific heat agrees with the value of 0.125 predicted...
Specific heat calculated from the Raman frequency shifts close to the gimel-phase transition in NH4Br Yurtseven, Hasan Hamit (Old City Publishing, Inc, 2003-01-01) We calculated the specific heat C-VI close to the lambda-phase transition in NH4Br on the basis of predictions of the Ising model. We have used our observed Raman frequencies of the nu(5) (134 cm(-1)) lattice mode to extract the critical exponent for the specific heat. The C-VI values calculated by us with this exponent value agree with the measured C-P data reported in the literature. This agreement is particularly good above T-lambda. This indicates that the observed behaviour of NH4Br can be satisfactori...
SPECIFIC HEAT CAPACITY OF FLOWERLIKE ZnO-PMMA COMPOSITES INVESTIGATED BY DSC. Sezer, Selda (2017-04-01) A series flowerlike ZnO-PMMA (FL-ZnO-PMMA) composites were synthesized from PMMA and different amount of flowerlike ZnO (FL- ZnO) particles via the solution direct-dispersing and in-situ polymerization method. FL-ZnO particles have been synthesized using the hydrothermally technique. Effects of synthesis conditions on the crystal structure, crystallite size, microstructure and morphological properties of the produced FL-ZnO particles were investigated by FTIR, X-ray and SEM. The prepared ZnO nanostructures ...
Specific heat related to the Raman frequency shifts for the rotatory mode in ammonia solid I close to the melting point Karacali, H; Yurtseven, Hasan Hamit (2006-03-01) This study gives an evidence for the validity of our spectroscopic modification of the Pippard relation as apphed to ammonia solid I close to the melting point. We use our calculated frequencies for the rotatory lattice (librational) mode in ammonia solid I for the pressures of 0, 1.93 and 3.07 kbars. We obtain that the specific heat C-p varies linearly with the frequency shifts 1/v(delta v/delta T)(p) for this Raman mode at those pressures studied in this crystalline system. Our values of the slope dP(m)/d...

Citation Formats

H. H. Yurtseven, “Specific heat of NH4Cl and NH4BrxCl 1-x crystals close to the ferro-ordered phase,” Journal of the Chemical Society of Pakistan, pp. 207–213, 2009, Accessed: 00, 2021. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=70349206009&origin=inward.