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Utilization of the post – filtration lye from the soda-chlorine-saltpetre method of soda production

Drużyński S., Trypuć M., Kiełkowska U., Mazurek K.

Polish Journal of Chemical Technology

2011

Vol. 13, nr 4

53-56

The optimal conditions were determined for the precipitation of ammonium metavanadate from the solutions of ammonium nitrate with the use of sodium metavanadate. The experiments were performed with the molar ratio of salts NH4NO3:NaVO3 1.5:1 at temperatures 293, 303, 313 and 323 K. Based on the obtained results, the optimal time of the process was determined as 5 h at 293–303K. Under these conditions, the achieved yield of the precipitation process was ~98.7%, while the contents of the vanadium salts in the post – filtration solution was ~0.02%.

Plotting of the solubility isotherm for the NH4NO3 + NaVO3 + H2O system

Trypuć M., Drużyński S., Mazurek K.

Polish Journal of Chemical Technology

2008

Vol. 10, nr 4

11-14

The equilibrium research was performed for the NH4NO3 + NaVO3 + NH4VO3 + NaNO3 + H2O system at 293 and 303 K. The location of the P1 and P2 triple points was determined on the equilibrium plots with the planar projection according to Jänecke method. The maximum yield of the conversion of ammonium nitrate(V) to ammonium vanadate(V) was calculated at P1 points. The results constitute the basis to design further equilibrium experiments aimed to precisely determine the lines separating the areas of the co-crystallization of salts in the investigated system on the equilibrium plots in the oblique projection on a plane according to Jänecke method.

Large magnetocaloric effect in perovskite manganites: magnetic entropy changes above 300 K

Phan M. H., Yu S. C., Ulyanov A. N., Lachowicz H. K.

Materials Science

2003

Vol. 21, No. 1

133-139

We present here, the results of an investigation of the large magnetic entropy change, M S D , above 300 K in a series of La0.65Sr0.35MnO3, La0.6Sr0.2Ca0.2MnO3, La0.6Sr0.2Ba0.2MnO3, La0.7Ba0.3MnO3 and La0.7Ba0.24Ca0.06MnO3 perovskite manganites. Among the studied compositions, La0.6Sr0.2Ba0.2MnO3 exhibits a highest value of 2.26 J/kg/K for |ASMmax| at the Curie temperature, TC = 354 K, when the field is changed from 0 to 10 kOe. The adiabatic temperature change, ATad, of this sample is ~ 1.1 K and ~ 4.95 K in the fields of 10 kOe and 50 kOe, respectively. Since the large magnetocaloric effect was found in the present materials with above 300 K Curie temperature, these materials seem to be attractive for above room temperature magnetic refrigeration applications.