In ternary system PbO-P2O5-PbCl2, the Pb3(PO4)2-Pb8P2O13-Pb10(PO4)6Cl2 partial ternary system has been examined by the thermal, microscopic, X-ray and dilatometric analyses, and its phase diagram provided. The components do not form any new chemical compounds.
The ternary system Y2O3−CaO−P2O5 has been examined by DTA, X-ray diffraction, IR and microscopic methods. Its phase diagram has been provided within the composition
range YPO4−Ca3(PO4)2−P2O5. The occurrence of four mixed phosphates: Ca3Y(PO4)3, CaYP3O10, CaY(PO3)5, Ca2Y(PO3)7 has been discovered in the system. Basic X-ray data have been determined for these newly discovered compounds and several
methods of their synthesis developed.
Authors:Ljubiša Balanović, Dragan Manasijević, Dragana Živković, Aleksandra Mitovski, Nadežda Talijan, Duško Minić, and Živan Živković
the thermal behaviour, the microstructure evolution of the solder itself and the possible interfacial between solder and substrate.
In this article, the phaseequilibria in the Al–Ge–Zn ternary system were predicted using calculation of phase
Authors:F. Querniard, Julie Linol, Y. Cartigny, and G. Coquerel
The resolution of (�)-5-phenyl-5-trifluoromethyl-imidazolidine-2,4-dione ((�)-CF361H hereafter) using 1-phenyl-ethylamine (αMBA hereafter) in ethanol was investigated. At 20�C, the evolution of the resolution
efficiency vs. the excess of αMBA was studied by establishing a part of the quaternary system: (+) and (−)-CF361H/(−)-αMBA/ethanol.
Competition between two equilibria has been highlighted:
Metastable equilibria between distereomeric salts ((�)-CF361H and enantiopure (−)-αMBA).
Stable equilibria involving a double salt Q which exhibits a non-congruent solubility.
The presence of this double salt leads to the resolution of diastereomeric salts but can drastically drop the yield if nothing
could act as inhibitor of its nucleation and growth.
Authors:Teresa Podhajska-Kaźmierczak and Teresa Znamierowska
In the ternary system MgO−Na2O−P2O5, the system Mg2P2O7−NaPO3 has been examined by thermal and X-ray methods and its phase diagram has been determined. The intermediate compound Na3Mg2P5O16 exists in this system. It melts peritectically at 948 K and decomposes to mixtures of sodium-magnesium metaphosphates and
magnesium pyrophosphate Mg2P2O7.
The behaviour of Al2(MoO4)3 towards AIVO4 in the subsolidus area, over the whole component concentration range, has been studied using the DTA and XRD methods. The
experimental results have been presented in the form of a phase diagram. It has been found that components of the system of
interest do not remain in equilibrium, and AlVO4−Al2(MoO4)3 system is not a real two-component system, even in the subsolidus area.
This study reports experimental investigations by DTA/TG analysis of (1−x)SnO2−xCuO compositions, up to 1773 K and at two oxygen partial pressures (i.e. air and argon). In air, DTA/TG results showed thermal
effects due exclusively to CuO presence in the initial mixture. No binary compounds were formed. The reduction process of
CuO to Cu2O over 1273 K as well as the formation over 1373 K of the liquid phase, have been evidenced. In argon atmosphere, CuO to Cu2O reduction reaction is shifted toward 1205 K, while the liquid phase appears in the studied mixtures over 1473 K. The formation
of an eutectic composition between SnO2−Cu2O, melting at 1491 K, coordinates:0.932Cu2O+0.068SnO2, has been experimentally established in argon.