Pecularities of lanthanum phosphate formation in molten phosphate-molybdate melts




lanthanum, molybdate, vanadate, glass structure, melt


It is established that the nature of crystal formation in the melts of the K–P–Mo–La–O–F system is determined by the ratio K/Mo and P/Mo. Crystallization fields of framework LaPO4 and K3La(PO4)2 with arcanite structure have been established. It is shown that the key factor in the formation of complex oxide compounds of rare earth elements from combined molybdate-phosphate melts is the K/Mo ratio in the initial solution — melt: at K/Mo = 0. 5 ÷ 1. 0 LnPO4 orthophosphates are formed, characterized by a framework structure of on LnO7/LnO8; and at K/Mo = 1. 5 ÷ 2. 5, double orthophosphates of the composition K3Ln(PO4)2 with an island structure are formed.


Download data is not yet available.


Yang, Z., Yuan, G., Duan, X., Liang, S. & Sun, G. (2020). HDEHP assisted solvothermal synthesis of monodispersed REPO4 (RE = La–Lu, Y) nanocrystals and their photoluminescence properties. New J. Chem., 44, No. 11, pp. 4386-4393.

Sousa Filho, P. C., Gacoin, T., Boilot, J. P., Walton, R. I. & Serra, O. A. (2015). Synthesis and luminescent properties of REVO4–REPO4 (RE = Y, Eu, Gd, Er, Tm, or Yb) heteronanostructures: a promising class of phosphors for excitation from NIR to VUV. J. Phys. Chem. C, 119, No. 42, pp. 24062-24074.

Wu, X., Bai, W., Hai, O., Ren, Q., Zheng, J. & Ren, Y. (2019). Tunable color of Tb3+/Eu3+/Tm3+-coactivated K3La(PO4)2 via energy transfer: a single-phase white-emitting phosphor. Opt. Laser Technol., 2019, 115, pp. 176-185.

Bedyal, A. K., Ramteke, D. D., Kumar, V. & Swart, H. C. (2018). Blue photons excited highly chromatic red light emitting K3La(PO4)2: Pr3+ phosphors for white light emitting diodes. Mater. Res. Bull., 103, pp. 173-180. materresbull. 2018. 03. 034

Zhao, D., Ma, F. X., Fan, Y. C., Li, H. Y. & Zhang, L. (2016). Self-activated luminescent material K3Dy(PO4)2: Crystal growth, structural analysis and characterizations. Optik, 127, No. 22, pp. 10297-10302.

Gupta, P. & Kumar, V. (2016). Structural, optical and spectral studies of Sm3+ doped K3GD(PO4)2 bulk and nanophosphors synthesized by different methods. Mater. Focus, 5, No. 3, pp. 227-242.

Ju, G., Hu, Y., Chen, L., Wang, X., Mu, Z., Wu, H. & Kang, F. (2012). A reddish orange-emitting stoichiometric phosphor K3Eu(PO4)2 for white light-emitting diodes. Opt. Laser Technol., 44, No. 1, pp. 39-42.

Nie, C. -K., Zhao, D., Duan, P. -G., Fan, Y. -C., Zhang, L. & Zhang, R. -J. (2018). Structure twinning and photoluminescence properties of sodium dysprosium phosphate Na3Dy(PO4)2. J. Mater. Sci.: Mater. Electron., 29, No. 2, pp. 1664-1671.

Farmer, J. M., Boatner, L. A., Chakoumakos, B. C., Rawn, C. J. & Richardson, J. (2016). Structural and crystal chemical properties of alkali rare-earth double phosphates. J. Alloys Compd., 655, pp. 253-265.

Benarafa, L., Rghioui, L., Nejjar, R., Idrissi, M. S., Knidiri, M., Lorriaux, A. & Wallart, F. (2005). Etude théorique et expérimentale des spectres de vibration des phosphates K3Ln(PO4)2. Spectrochim. Acta. A. Mol. Biomol. Spectrosc., 61, No. 3, pp. 419-430.

Terebilenko, K. V., Kyselov, D. V., Baumer, V. N., Slobodyanik, M. S., Petrenko, O. V., Khomenko, O. V. & Dotsenko, V. P. (2018). Flux synthesis, monoclinic structure, and luminescence of europium(III)-doped K3La (PO4)2. Cryst. Res. Technol., 53, No. 10, 1800158.



How to Cite

Terebilenko К. ., Shnuikov С. ., & Slobodyanik М. . (2022). Pecularities of lanthanum phosphate formation in molten phosphate-molybdate melts. Reports of the National Academy of Sciences of Ukraine, (5), 87–93.