Synthesis, Crystal Structure, and Physicochemical Properties of Bi4–xPrxTi3O12 (x = 0.4, 0.8, 1.2, 1.6) Solid Solutions

Денисова, Л. Т.; Мolokeev, Maxim S.; Kargin, Yu. F.; Gerasimov, V. S.; Krylov, A. S.; Aleksandrovskii, A. S.; Чумилина, Л. Г.; Денисов, В. М.; Vasil’ev, G. V.

doi:10.1134/s002016852109003x

Cited by 2 publications

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“…One more peculiarity is the absence of the 3 P 0 → 3 F 3 line that is completely unobservable at the background of the 3 P 1 → 3 F 4 band. This latter effect cannot be related to the reabsorption; however, it must be associated with a certain dependence of the intensity of this line on the crystal field, like it has been recently observed in [94].…”

Section: Luminescent Propertiesmentioning

confidence: 49%

Exploration of the Crystal Structure and Thermal and Spectroscopic Properties of Monoclinic Praseodymium Sulfate Pr2(SO4)3

et al. 2022

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Praseodymium sulfate was obtained by the precipitation method and the crystal structure was determined by Rietveld analysis. Pr2(SO4)3 is crystallized in the monoclinic structure, space group C2/c, with cell parameters a = 21.6052 (4), b = 6.7237 (1) and c = 6.9777 (1) Å, β = 107.9148 (7)°, Z = 4, V = 964.48 (3) Å3 (T = 150 °C). The thermal expansion of Pr2(SO4)3 is strongly anisotropic. As was obtained by XRD measurements, all cell parameters are increased on heating. However, due to a strong increase of the monoclinic angle β, there is a direction of negative thermal expansion. In the argon atmosphere, Pr2(SO4)3 is stable in the temperature range of T = 30–870 °C. The kinetics of the thermal decomposition process of praseodymium sulfate octahydrate Pr2(SO4)3·8H2O was studied as well. The vibrational properties of Pr2(SO4)3 were examined by Raman and Fourier-transform infrared absorption spectroscopy methods. The band gap structure of Pr2(SO4)3 was evaluated by ab initio calculations, and it was found that the valence band top is dominated by the p electrons of oxygen ions, while the conduction band bottom is formed by the d electrons of Pr3+ ions. The exact position of ZPL is determined via PL and PLE spectra at 77 K to be at 481 nm, and that enabled a correct assignment of luminescent bands. The maximum luminescent band in Pr2(SO4)3 belongs to the 3P0 → 3F2 transition at 640 nm.

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Section: Luminescent Propertiesmentioning

confidence: 49%