摘要:
To synthesize pure γ-La
2S
3 at lower temperature, lanthanide complex La(Et
2S
2CN)
3·phen, containing La-S bond, was chosen as the precursors to decompose. The obtained samples were characterized by X-ray power diffraction (XRD), field-emission scanning electron microscopy (FE-SEM) with an energy dispersive spectrometer and UV-Vis diffuse reflectance spectra. The decomposition mechanism of the lanthanide complex was studied by thermogravimetric analyses (TGA). The results show that the obtained samples are cubic phase particles with sizes among 20–50 nm and the band gap is 2.97 eV, which is bigger than that of its bulk crystal. TG/DTG results indicate that La(Et
2S
2CN)
3·phen decomposed to γ-La
2S
3 via La
4(Et
2S
2CN)
3 as an intermediate product.