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Single-phase Eu3S4was obtained via CS2gas sulfurization of Eu2O3nanospheres at 773 K for longer than 0.5 h. The primary particle size of Eu3S4became larger than that of Eu2O3during the sulfurization process. Pure synthetic Eu3S4powders were unstable and transformed to EuS at 873 K under vacuum. Eu3S4compacts were sintered in temperature range of 773 K to 1173 K and they transformed to EuS at 1473...
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