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Phase equilibria in the ternary system PbO-P2O5-PbCl2

II. The partial system PbO-7PbO · PO2.5 · PbCl2(R)-Pb10(PO4)6Cl2-Pb8P2O13

Journal of Thermal Analysis and Calorimetry
Author: H. Podsiadlo
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Phase equilibria in the ternary system PbO-P2O5-PbCl2

III. The partial system PbO-Pb5Cl2O4-Pb10(PO4)6Cl2-14PbO·P2O5·2PbCl2

Journal of Thermal Analysis and Calorimetry
Author: H. Podsiadlo
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Abstract  

The ternary system CePO4−NaPO3−Ce(PO3)3 was investigated by differential thermal analysis, powder X-ray diffraction and microscopy in reflected light. Two double phosphates, NaCeP2O7 and NaCe(PO3)4, occur in this system. Both NaCeP2O7 and NaCe(PO3)4 melt incongruently, at 800 and 865°C, respectively. Two systems, NaCeP2O7−NaCe(PO3)4 and CePO4−NaCe(PO3)4, were found to occur in this region. Their phase diagrams are presented.

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The phase diagram of the La-S-O system at 1073 K was established with the vacuum seal technique. Six phases exist at this temperature: La2O3 (B-type), LaS2, La2S3, La2O2SO4, La2O2S and La2O2S2. The thermodynamic functions for the reaction La2O2SO4=La2O3+SO2+1/2 O2 were determined by using the emf method at temperatures from 1123 to 1373 K. The mechanisms of the oxidation reactions in the La-S-O system under different partial pressures of oxygen (−4.4 < log <−0.7) were also investigated by means of DTA, TG and powder X-ray diffractometry.

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Abstract  

The phase diagram of the system Ag4SSe–As2Se3 is studied by means of X-ray diffraction, differential thermal analyses and measurements of the microhardness and the density of the materials. The unit-cell parameters of the intermediate phases 3Ag4SSeAs2Se3 (phase A) and Ag4SSe2As2Se3 (phase B) are determined as follows for phase A: a=4.495 , b=3.990 , c=4.042 , α=89.05, β=108.98, γ=92.93; for phase B: a=4.463 , b=4.136 , c=3.752 , α=118.60, β=104.46, γ=83.14. The phase 3Ag4SSeAs2Se3 and Ag4SSe2As2Se3 have a polymorphic transition α↔β consequently at 105 and 120C. The phase A melts incongruently at 390C and phase B congruently at the same temperature.

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In the ternary system La2O3-P2O5-Na2O the partial system La2O3-Na4La2P4O15-LaPO4 has been examined by the thermal, dilatometric X-ray and microscopic analyses and its phase diagram provided. The lanthanum oxyphosphate La3PO7 melts incongruently at the 1590°C temperature and crystallizes in a monoclinic systema=11.20 Å,b=11.94 Å,c=7.01 Å,γ=93.79 andV=936.97 Å3.

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The behaviour of V2O5 against FeVMoO7 up to 1000 °C in the whole range of component concentrations was investigated using DTA and X-ray powder diffraction methods. The experimental results are presented in the form of a phase diagram.

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