Application of the Pippard relations to ammonia near the melting point

This study gives our application of the Pippard relations to the ammonia near its melting point. The Pippard relations between the specific heat C-P, the thermal expansivity alpha(P) and the isothermal compressibility kappa(T), have been established for the ammonia near its melting point. We have obtained that the Pippard relations are valid for the ammonia. We give here an evidence that on the basis of the experimental data the critical transition in this system near its melting point can be considered as the lambda-type phase transition.


Improvement of mechanical and flame retardancy properties of biocomposites based on low density polyethylene and polylactic acid
Altun, Yasemin; Bayramlı, Erdal; Doğan, Mehmet Onur; Department of Polymer Science and Technology (2015)
The main objective of this study was to improve the mechanical and flame retardant properties of low density polyethylene (LDPE) and poly (lactic acid) (PLA) based biocomposites. Wood flour (WF) and jute fabric were used as the fillers. In the mechanical property improvement studies with LDPE, the effect of two compatibilizing agents MA (random terpolymer of ethylene, acrylic ester and maleic acid) and GMA (random terpolymer of ethylene, acrylic ester and glycidyl metacrylate) functionalized polymers at dif...
Surface modification of Ti6Al4V by micro-arc oxidation in AgC2H3O2-containing electrolyte
Aydogan, Dilek Teker; Muhaffel, Faiz; Acar, Ozge Karabiyik; Topcuoglu, Emine Nursen; Kulekci, Hatice Guven; Kose, Gamze Torun; Baydoğan, Murat; Çimenoğlu, Hüseyin (2018-09-01)
This study focuses on the biological properties of Ti6Al4V after employing micro-arc oxidation in sodium phosphateand calcium acetate-containing electrolyte with and without addition of silver acetate. After micro-arc oxidation process, structural features of the surfaces were analyzed by using an energy dispersive X-ray spectrometer equipped scanning electron microscope, an X-ray diffractometer and a Fourier transform infrared spectroscope. The micro-arc oxidation process generated multilayer coatings comp...
Adsorption of Cd(II) ions from aqueous solutions using activated carbon prepared from olive stone by ZnCl2 activation
Kula, Ibrahim; Ugurlu, Mehmet; Karaoglu, M. Hamdi; Celik, Ali (2008-02-01)
This study is aimed to remove Cd(II) ions from aqueous solutions by adsorption. As adsorbent, activated carbon prepared from olive stone, an agricultural solid by-product was used. Different activating agent (ZnCl2) amounts and adsorbent particle size were studied to optimize adsorbent surface area. The adsorption experiments were conducted at different parameters such as, adsorbent dose, temperature, equilibrium time and pH. According to the experiments results, the equilibrium time, optimum pH, adsorbent ...
Investigation of deep eutectic solvents as a reaction medium for metal chloride based chemical heat pumps
Gözde, Ezgi; Karakaş, Gürkan; Department of Chemical Engineering (2019)
Metal chlorides can react with gas phase ammonia and form complex compounds. Due to reversibility and high heat of reaction, these ionic reactions are attractive for the application of chemical heat pumps which can provide the ability to capture the rejected low-grade heat and to reuse it at increased temperature levels. The pressure and temperature interval of ammonia sorption into CaCl₂is suitable for heat upgrade of waste heat streams, geothermal energy and solar energy sources.However, heat and mass tra...
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, “Application of the Pippard relations to ammonia near the melting point,” INTERNATIONAL JOURNAL OF MODERN PHYSICS B, pp. 2783–2790, 1999, Accessed: 00, 2020. [Online]. Available: