Abstract
In the binary system PbO–LazO3 only one compound, 4PbO.La2O3, exists; it is flanked by two eutectics. The structure of the compound, although of lower symmetry, is intimately related to the C modification of the rare earths. Below 800° to 1000°C, metastable solid solutions are formed from oxide mixtures coprecipitated from mixed solutions of the nitrates, the cubic parameter a= 5.66 A, if extrapolated to pure La2O3, corresponding to half the a parameter of the C form of La2O3. The solid solutions existing between the compositions La2O3–2Pb0 and pure La2O3 have a cubic face–centered lattice and obey Vegard's rule. The systems of PbO with Sm2O3 and Gd2O8 are quite similar to that with La2O3. The compound Sm2O3.4Pb0 decomposes at 1000°C with evaporation of PbO; Sm2O3 remains in the B modification.
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